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-rw-r--r--kernel/exit.c4
-rw-r--r--kernel/hw_breakpoint.c62
-rw-r--r--kernel/perf_event.c2186
-rw-r--r--kernel/sched.c2
-rw-r--r--kernel/trace/ftrace.c18
-rw-r--r--kernel/trace/ring_buffer.c21
-rw-r--r--kernel/trace/trace_event_perf.c28
-rw-r--r--kernel/trace/trace_events.c55
-rw-r--r--kernel/trace/trace_functions_graph.c126
-rw-r--r--kernel/watchdog.c36
10 files changed, 1519 insertions, 1019 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 03120229db28..e2bdf37f9fde 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -149,9 +149,7 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
{
struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
-#ifdef CONFIG_PERF_EVENTS
- WARN_ON_ONCE(tsk->perf_event_ctxp);
-#endif
+ perf_event_delayed_put(tsk);
trace_sched_process_free(tsk);
put_task_struct(tsk);
}
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index d71a987fd2bf..3b2aaffb65f0 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -565,6 +565,61 @@ static struct notifier_block hw_breakpoint_exceptions_nb = {
.priority = 0x7fffffff
};
+static void bp_perf_event_destroy(struct perf_event *event)
+{
+ release_bp_slot(event);
+}
+
+static int hw_breakpoint_event_init(struct perf_event *bp)
+{
+ int err;
+
+ if (bp->attr.type != PERF_TYPE_BREAKPOINT)
+ return -ENOENT;
+
+ err = register_perf_hw_breakpoint(bp);
+ if (err)
+ return err;
+
+ bp->destroy = bp_perf_event_destroy;
+
+ return 0;
+}
+
+static int hw_breakpoint_add(struct perf_event *bp, int flags)
+{
+ if (!(flags & PERF_EF_START))
+ bp->hw.state = PERF_HES_STOPPED;
+
+ return arch_install_hw_breakpoint(bp);
+}
+
+static void hw_breakpoint_del(struct perf_event *bp, int flags)
+{
+ arch_uninstall_hw_breakpoint(bp);
+}
+
+static void hw_breakpoint_start(struct perf_event *bp, int flags)
+{
+ bp->hw.state = 0;
+}
+
+static void hw_breakpoint_stop(struct perf_event *bp, int flags)
+{
+ bp->hw.state = PERF_HES_STOPPED;
+}
+
+static struct pmu perf_breakpoint = {
+ .task_ctx_nr = perf_sw_context, /* could eventually get its own */
+
+ .event_init = hw_breakpoint_event_init,
+ .add = hw_breakpoint_add,
+ .del = hw_breakpoint_del,
+ .start = hw_breakpoint_start,
+ .stop = hw_breakpoint_stop,
+ .read = hw_breakpoint_pmu_read,
+};
+
static int __init init_hw_breakpoint(void)
{
unsigned int **task_bp_pinned;
@@ -586,6 +641,8 @@ static int __init init_hw_breakpoint(void)
constraints_initialized = 1;
+ perf_pmu_register(&perf_breakpoint);
+
return register_die_notifier(&hw_breakpoint_exceptions_nb);
err_alloc:
@@ -601,8 +658,3 @@ static int __init init_hw_breakpoint(void)
core_initcall(init_hw_breakpoint);
-struct pmu perf_ops_bp = {
- .enable = arch_install_hw_breakpoint,
- .disable = arch_uninstall_hw_breakpoint,
- .read = hw_breakpoint_pmu_read,
-};
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index db5b56064687..440f9ca067b2 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -31,24 +31,18 @@
#include <linux/kernel_stat.h>
#include <linux/perf_event.h>
#include <linux/ftrace_event.h>
-#include <linux/hw_breakpoint.h>
#include <asm/irq_regs.h>
-/*
- * Each CPU has a list of per CPU events:
- */
-static DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
-
-int perf_max_events __read_mostly = 1;
-static int perf_reserved_percpu __read_mostly;
-static int perf_overcommit __read_mostly = 1;
-
static atomic_t nr_events __read_mostly;
static atomic_t nr_mmap_events __read_mostly;
static atomic_t nr_comm_events __read_mostly;
static atomic_t nr_task_events __read_mostly;
+static LIST_HEAD(pmus);
+static DEFINE_MUTEX(pmus_lock);
+static struct srcu_struct pmus_srcu;
+
/*
* perf event paranoia level:
* -1 - not paranoid at all
@@ -67,36 +61,39 @@ int sysctl_perf_event_sample_rate __read_mostly = 100000;
static atomic64_t perf_event_id;
-/*
- * Lock for (sysadmin-configurable) event reservations:
- */
-static DEFINE_SPINLOCK(perf_resource_lock);
+void __weak perf_event_print_debug(void) { }
-/*
- * Architecture provided APIs - weak aliases:
- */
-extern __weak const struct pmu *hw_perf_event_init(struct perf_event *event)
+void perf_pmu_disable(struct pmu *pmu)
{
- return NULL;
+ int *count = this_cpu_ptr(pmu->pmu_disable_count);
+ if (!(*count)++)
+ pmu->pmu_disable(pmu);
}
-void __weak hw_perf_disable(void) { barrier(); }
-void __weak hw_perf_enable(void) { barrier(); }
+void perf_pmu_enable(struct pmu *pmu)
+{
+ int *count = this_cpu_ptr(pmu->pmu_disable_count);
+ if (!--(*count))
+ pmu->pmu_enable(pmu);
+}
-void __weak perf_event_print_debug(void) { }
+static void perf_pmu_rotate_start(struct pmu *pmu)
+{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
-static DEFINE_PER_CPU(int, perf_disable_count);
+ if (hrtimer_active(&cpuctx->timer))
+ return;
-void perf_disable(void)
-{
- if (!__get_cpu_var(perf_disable_count)++)
- hw_perf_disable();
+ __hrtimer_start_range_ns(&cpuctx->timer,
+ ns_to_ktime(cpuctx->timer_interval), 0,
+ HRTIMER_MODE_REL_PINNED, 0);
}
-void perf_enable(void)
+static void perf_pmu_rotate_stop(struct pmu *pmu)
{
- if (!--__get_cpu_var(perf_disable_count))
- hw_perf_enable();
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+
+ hrtimer_cancel(&cpuctx->timer);
}
static void get_ctx(struct perf_event_context *ctx)
@@ -151,13 +148,13 @@ static u64 primary_event_id(struct perf_event *event)
* the context could get moved to another task.
*/
static struct perf_event_context *
-perf_lock_task_context(struct task_struct *task, unsigned long *flags)
+perf_lock_task_context(struct task_struct *task, int ctxn, unsigned long *flags)
{
struct perf_event_context *ctx;
rcu_read_lock();
- retry:
- ctx = rcu_dereference(task->perf_event_ctxp);
+retry:
+ ctx = rcu_dereference(task->perf_event_ctxp[ctxn]);
if (ctx) {
/*
* If this context is a clone of another, it might
@@ -170,7 +167,7 @@ perf_lock_task_context(struct task_struct *task, unsigned long *flags)
* can't get swapped on us any more.
*/
raw_spin_lock_irqsave(&ctx->lock, *flags);
- if (ctx != rcu_dereference(task->perf_event_ctxp)) {
+ if (ctx != rcu_dereference(task->perf_event_ctxp[ctxn])) {
raw_spin_unlock_irqrestore(&ctx->lock, *flags);
goto retry;
}
@@ -189,12 +186,13 @@ perf_lock_task_context(struct task_struct *task, unsigned long *flags)
* can't get swapped to another task. This also increments its
* reference count so that the context can't get freed.
*/
-static struct perf_event_context *perf_pin_task_context(struct task_struct *task)
+static struct perf_event_context *
+perf_pin_task_context(struct task_struct *task, int ctxn)
{
struct perf_event_context *ctx;
unsigned long flags;
- ctx = perf_lock_task_context(task, &flags);
+ ctx = perf_lock_task_context(task, ctxn, &flags);
if (ctx) {
++ctx->pin_count;
raw_spin_unlock_irqrestore(&ctx->lock, flags);
@@ -302,6 +300,8 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
}
list_add_rcu(&event->event_entry, &ctx->event_list);
+ if (!ctx->nr_events)
+ perf_pmu_rotate_start(ctx->pmu);
ctx->nr_events++;
if (event->attr.inherit_stat)
ctx->nr_stat++;
@@ -436,7 +436,7 @@ event_sched_out(struct perf_event *event,
event->state = PERF_EVENT_STATE_OFF;
}
event->tstamp_stopped = ctx->time;
- event->pmu->disable(event);
+ event->pmu->del(event, 0);
event->oncpu = -1;
if (!is_software_event(event))
@@ -466,6 +466,12 @@ group_sched_out(struct perf_event *group_event,
cpuctx->exclusive = 0;
}
+static inline struct perf_cpu_context *
+__get_cpu_context(struct perf_event_context *ctx)
+{
+ return this_cpu_ptr(ctx->pmu->pmu_cpu_context);
+}
+
/*
* Cross CPU call to remove a performance event
*
@@ -474,9 +480,9 @@ group_sched_out(struct perf_event *group_event,
*/
static void __perf_event_remove_from_context(void *info)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_event *event = info;
struct perf_event_context *ctx = event->ctx;
+ struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
/*
* If this is a task context, we need to check whether it is
@@ -487,27 +493,11 @@ static void __perf_event_remove_from_context(void *info)
return;
raw_spin_lock(&ctx->lock);
- /*
- * Protect the list operation against NMI by disabling the
- * events on a global level.
- */
- perf_disable();
event_sched_out(event, cpuctx, ctx);
list_del_event(event, ctx);
- if (!ctx->task) {
- /*
- * Allow more per task events with respect to the
- * reservation:
- */
- cpuctx->max_pertask =
- min(perf_max_events - ctx->nr_events,
- perf_max_events - perf_reserved_percpu);
- }
-
- perf_enable();
raw_spin_unlock(&ctx->lock);
}
@@ -572,8 +562,8 @@ retry:
static void __perf_event_disable(void *info)
{
struct perf_event *event = info;
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_event_context *ctx = event->ctx;
+ struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
/*
* If this is a per-task event, need to check whether this
@@ -628,7 +618,7 @@ void perf_event_disable(struct perf_event *event)
return;
}
- retry:
+retry:
task_oncpu_function_call(task, __perf_event_disable, event);
raw_spin_lock_irq(&ctx->lock);
@@ -667,7 +657,7 @@ event_sched_in(struct perf_event *event,
*/
smp_wmb();
- if (event->pmu->enable(event)) {
+ if (event->pmu->add(event, PERF_EF_START)) {
event->state = PERF_EVENT_STATE_INACTIVE;
event->oncpu = -1;
return -EAGAIN;
@@ -691,22 +681,15 @@ group_sched_in(struct perf_event *group_event,
struct perf_event_context *ctx)
{
struct perf_event *event, *partial_group = NULL;
- const struct pmu *pmu = group_event->pmu;
- bool txn = false;
+ struct pmu *pmu = group_event->pmu;
if (group_event->state == PERF_EVENT_STATE_OFF)
return 0;
- /* Check if group transaction availabe */
- if (pmu->start_txn)
- txn = true;
-
- if (txn)
- pmu->start_txn(pmu);
+ pmu->start_txn(pmu);
if (event_sched_in(group_event, cpuctx, ctx)) {
- if (txn)
- pmu->cancel_txn(pmu);
+ pmu->cancel_txn(pmu);
return -EAGAIN;
}
@@ -720,7 +703,7 @@ group_sched_in(struct perf_event *group_event,
}
}
- if (!txn || !pmu->commit_txn(pmu))
+ if (!pmu->commit_txn(pmu))
return 0;
group_error:
@@ -735,8 +718,7 @@ group_error:
}
event_sched_out(group_event, cpuctx, ctx);
- if (txn)
- pmu->cancel_txn(pmu);
+ pmu->cancel_txn(pmu);
return -EAGAIN;
}
@@ -789,10 +771,10 @@ static void add_event_to_ctx(struct perf_event *event,
*/
static void __perf_install_in_context(void *info)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_event *event = info;
struct perf_event_context *ctx = event->ctx;
struct perf_event *leader = event->group_leader;
+ struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
int err;
/*
@@ -812,12 +794,6 @@ static void __perf_install_in_context(void *info)
ctx->is_active = 1;
update_context_time(ctx);
- /*
- * Protect the list operation against NMI by disabling the
- * events on a global level. NOP for non NMI based events.
- */
- perf_disable();
-
add_event_to_ctx(event, ctx);
if (event->cpu != -1 && event->cpu != smp_processor_id())
@@ -855,12 +831,7 @@ static void __perf_install_in_context(void *info)
}
}
- if (!err && !ctx->task && cpuctx->max_pertask)
- cpuctx->max_pertask--;
-
- unlock:
- perf_enable();
-
+unlock:
raw_spin_unlock(&ctx->lock);
}
@@ -883,6 +854,8 @@ perf_install_in_context(struct perf_event_context *ctx,
{
struct task_struct *task = ctx->task;
+ event->ctx = ctx;
+
if (!task) {
/*
* Per cpu events are installed via an smp call and
@@ -931,10 +904,12 @@ static void __perf_event_mark_enabled(struct perf_event *event,
event->state = PERF_EVENT_STATE_INACTIVE;
event->tstamp_enabled = ctx->time - event->total_time_enabled;
- list_for_each_entry(sub, &event->sibling_list, group_entry)
- if (sub->state >= PERF_EVENT_STATE_INACTIVE)
+ list_for_each_entry(sub, &event->sibling_list, group_entry) {
+ if (sub->state >= PERF_EVENT_STATE_INACTIVE) {
sub->tstamp_enabled =
ctx->time - sub->total_time_enabled;
+ }
+ }
}
/*
@@ -943,9 +918,9 @@ static void __perf_event_mark_enabled(struct perf_event *event,
static void __perf_event_enable(void *info)
{
struct perf_event *event = info;
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_event_context *ctx = event->ctx;
struct perf_event *leader = event->group_leader;
+ struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
int err;
/*
@@ -979,12 +954,10 @@ static void __perf_event_enable(void *info)
if (!group_can_go_on(event, cpuctx, 1)) {
err = -EEXIST;
} else {
- perf_disable();
if (event == leader)
err = group_sched_in(event, cpuctx, ctx);
else
err = event_sched_in(event, cpuctx, ctx);
- perf_enable();
}
if (err) {
@@ -1000,7 +973,7 @@ static void __perf_event_enable(void *info)
}
}
- unlock:
+unlock:
raw_spin_unlock(&ctx->lock);
}
@@ -1041,7 +1014,7 @@ void perf_event_enable(struct perf_event *event)
if (event->state == PERF_EVENT_STATE_ERROR)
event->state = PERF_EVENT_STATE_OFF;
- retry:
+retry:
raw_spin_unlock_irq(&ctx->lock);
task_oncpu_function_call(task, __perf_event_enable, event);
@@ -1061,7 +1034,7 @@ void perf_event_enable(struct perf_event *event)
if (event->state == PERF_EVENT_STATE_OFF)
__perf_event_mark_enabled(event, ctx);
- out:
+out:
raw_spin_unlock_irq(&ctx->lock);
}
@@ -1092,26 +1065,26 @@ static void ctx_sched_out(struct perf_event_context *ctx,
struct perf_event *event;
raw_spin_lock(&ctx->lock);
+ perf_pmu_disable(ctx->pmu);
ctx->is_active = 0;
if (likely(!ctx->nr_events))
goto out;
update_context_time(ctx);
- perf_disable();
if (!ctx->nr_active)
- goto out_enable;
+ goto out;
- if (event_type & EVENT_PINNED)
+ if (event_type & EVENT_PINNED) {
list_for_each_entry(event, &ctx->pinned_groups, group_entry)
group_sched_out(event, cpuctx, ctx);
+ }
- if (event_type & EVENT_FLEXIBLE)
+ if (event_type & EVENT_FLEXIBLE) {
list_for_each_entry(event, &ctx->flexible_groups, group_entry)
group_sched_out(event, cpuctx, ctx);
-
- out_enable:
- perf_enable();
- out:
+ }
+out:
+ perf_pmu_enable(ctx->pmu);
raw_spin_unlock(&ctx->lock);
}
@@ -1209,34 +1182,25 @@ static void perf_event_sync_stat(struct perf_event_context *ctx,
}
}
-/*
- * Called from scheduler to remove the events of the current task,
- * with interrupts disabled.
- *
- * We stop each event and update the event value in event->count.
- *
- * This does not protect us against NMI, but disable()
- * sets the disabled bit in the control field of event _before_
- * accessing the event control register. If a NMI hits, then it will
- * not restart the event.
- */
-void perf_event_task_sched_out(struct task_struct *task,
- struct task_struct *next)
+void perf_event_context_sched_out(struct task_struct *task, int ctxn,
+ struct task_struct *next)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- struct perf_event_context *ctx = task->perf_event_ctxp;
+ struct perf_event_context *ctx = task->perf_event_ctxp[ctxn];
struct perf_event_context *next_ctx;
struct perf_event_context *parent;
+ struct perf_cpu_context *cpuctx;
int do_switch = 1;
- perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0);
+ if (likely(!ctx))
+ return;
- if (likely(!ctx || !cpuctx->task_ctx))
+ cpuctx = __get_cpu_context(ctx);
+ if (!cpuctx->task_ctx)
return;
rcu_read_lock();
parent = rcu_dereference(ctx->parent_ctx);
- next_ctx = next->perf_event_ctxp;
+ next_ctx = next->perf_event_ctxp[ctxn];
if (parent && next_ctx &&
rcu_dereference(next_ctx->parent_ctx) == parent) {
/*
@@ -1255,8 +1219,8 @@ void perf_event_task_sched_out(struct task_struct *task,
* XXX do we need a memory barrier of sorts
* wrt to rcu_dereference() of perf_event_ctxp
*/
- task->perf_event_ctxp = next_ctx;
- next->perf_event_ctxp = ctx;
+ task->perf_event_ctxp[ctxn] = next_ctx;
+ next->perf_event_ctxp[ctxn] = ctx;
ctx->task = next;
next_ctx->task = task;
do_switch = 0;
@@ -1274,10 +1238,35 @@ void perf_event_task_sched_out(struct task_struct *task,
}
}
+#define for_each_task_context_nr(ctxn) \
+ for ((ctxn) = 0; (ctxn) < perf_nr_task_contexts; (ctxn)++)
+
+/*
+ * Called from scheduler to remove the events of the current task,
+ * with interrupts disabled.
+ *
+ * We stop each event and update the event value in event->count.
+ *
+ * This does not protect us against NMI, but disable()
+ * sets the disabled bit in the control field of event _before_
+ * accessing the event control register. If a NMI hits, then it will
+ * not restart the event.
+ */
+void perf_event_task_sched_out(struct task_struct *task,
+ struct task_struct *next)
+{
+ int ctxn;
+
+ perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0);
+
+ for_each_task_context_nr(ctxn)
+ perf_event_context_sched_out(task, ctxn, next);
+}
+
static void task_ctx_sched_out(struct perf_event_context *ctx,
enum event_type_t event_type)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+ struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
if (!cpuctx->task_ctx)
return;
@@ -1350,9 +1339,10 @@ ctx_flexible_sched_in(struct perf_event_context *ctx,
if (event->cpu != -1 && event->cpu != smp_processor_id())
continue;
- if (group_can_go_on(event, cpuctx, can_add_hw))
+ if (group_can_go_on(event, cpuctx, can_add_hw)) {
if (group_sched_in(event, cpuctx, ctx))
can_add_hw = 0;
+ }
}
}
@@ -1368,8 +1358,6 @@ ctx_sched_in(struct perf_event_context *ctx,
ctx->timestamp = perf_clock();
- perf_disable();
-
/*
* First go through the list and put on any pinned groups
* in order to give them the best chance of going on.
@@ -1381,8 +1369,7 @@ ctx_sched_in(struct perf_event_context *ctx,
if (event_type & EVENT_FLEXIBLE)
ctx_flexible_sched_in(ctx, cpuctx);
- perf_enable();
- out:
+out:
raw_spin_unlock(&ctx->lock);
}
@@ -1394,43 +1381,28 @@ static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
ctx_sched_in(ctx, cpuctx, event_type);
}
-static void task_ctx_sched_in(struct task_struct *task,
+static void task_ctx_sched_in(struct perf_event_context *ctx,
enum event_type_t event_type)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- struct perf_event_context *ctx = task->perf_event_ctxp;
+ struct perf_cpu_context *cpuctx;
- if (likely(!ctx))
- return;
+ cpuctx = __get_cpu_context(ctx);
if (cpuctx->task_ctx == ctx)
return;
+
ctx_sched_in(ctx, cpuctx, event_type);
cpuctx->task_ctx = ctx;
}
-/*
- * Called from scheduler to add the events of the current task
- * with interrupts disabled.
- *
- * We restore the event value and then enable it.
- *
- * This does not protect us against NMI, but enable()
- * sets the enabled bit in the control field of event _before_
- * accessing the event control register. If a NMI hits, then it will
- * keep the event running.
- */
-void perf_event_task_sched_in(struct task_struct *task)
-{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- struct perf_event_context *ctx = task->perf_event_ctxp;
- if (likely(!ctx))
- return;
+void perf_event_context_sched_in(struct perf_event_context *ctx)
+{
+ struct perf_cpu_context *cpuctx;
+ cpuctx = __get_cpu_context(ctx);
if (cpuctx->task_ctx == ctx)
return;
- perf_disable();
-
+ perf_pmu_disable(ctx->pmu);
/*
* We want to keep the following priority order:
* cpu pinned (that don't need to move), task pinned,
@@ -1444,7 +1416,37 @@ void perf_event_task_sched_in(struct task_struct *task)
cpuctx->task_ctx = ctx;
- perf_enable();
+ /*
+ * Since these rotations are per-cpu, we need to ensure the
+ * cpu-context we got scheduled on is actually rotating.
+ */
+ perf_pmu_rotate_start(ctx->pmu);
+ perf_pmu_enable(ctx->pmu);
+}
+
+/*
+ * Called from scheduler to add the events of the current task
+ * with interrupts disabled.
+ *
+ * We restore the event value and then enable it.
+ *
+ * This does not protect us against NMI, but enable()
+ * sets the enabled bit in the control field of event _before_
+ * accessing the event control register. If a NMI hits, then it will
+ * keep the event running.
+ */
+void perf_event_task_sched_in(struct task_struct *task)
+{
+ struct perf_event_context *ctx;
+ int ctxn;
+
+ for_each_task_context_nr(ctxn) {
+ ctx = task->perf_event_ctxp[ctxn];
+ if (likely(!ctx))
+ continue;
+
+ perf_event_context_sched_in(ctx);
+ }
}
#define MAX_INTERRUPTS (~0ULL)
@@ -1524,22 +1526,6 @@ do { \
return div64_u64(dividend, divisor);
}
-static void perf_event_stop(struct perf_event *event)
-{
- if (!event->pmu->stop)
- return event->pmu->disable(event);
-
- return event->pmu->stop(event);
-}
-
-static int perf_event_start(struct perf_event *event)
-{
- if (!event->pmu->start)
- return event->pmu->enable(event);
-
- return event->pmu->start(event);
-}
-
static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
{
struct hw_perf_event *hwc = &event->hw;
@@ -1559,15 +1545,13 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
hwc->sample_period = sample_period;
if (local64_read(&hwc->period_left) > 8*sample_period) {
- perf_disable();
- perf_event_stop(event);
+ event->pmu->stop(event, PERF_EF_UPDATE);
local64_set(&hwc->period_left, 0);
- perf_event_start(event);
- perf_enable();
+ event->pmu->start(event, PERF_EF_RELOAD);
}
}
-static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
+static void perf_ctx_adjust_freq(struct perf_event_context *ctx, u64 period)
{
struct perf_event *event;
struct hw_perf_event *hwc;
@@ -1592,23 +1576,19 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
*/
if (interrupts == MAX_INTERRUPTS) {
perf_log_throttle(event, 1);
- perf_disable();
- event->pmu->unthrottle(event);
- perf_enable();
+ event->pmu->start(event, 0);
}
if (!event->attr.freq || !event->attr.sample_freq)
continue;
- perf_disable();
event->pmu->read(event);
now = local64_read(&event->count);
delta = now - hwc->freq_count_stamp;
hwc->freq_count_stamp = now;
if (delta > 0)
- perf_adjust_period(event, TICK_NSEC, delta);
- perf_enable();
+ perf_adjust_period(event, period, delta);
}
raw_spin_unlock(&ctx->lock);
}
@@ -1626,32 +1606,41 @@ static void rotate_ctx(struct perf_event_context *ctx)
raw_spin_unlock(&ctx->lock);
}
-void perf_event_task_tick(struct task_struct *curr)
+/*
+ * Cannot race with ->pmu_rotate_start() because this is ran from hardirq
+ * context, and ->pmu_rotate_start() is called with irqs disabled (both are
+ * cpu affine, so there are no SMP races).
+ */
+static enum hrtimer_restart perf_event_context_tick(struct hrtimer *timer)
{
+ enum hrtimer_restart restart = HRTIMER_NORESTART;
struct perf_cpu_context *cpuctx;
- struct perf_event_context *ctx;
+ struct perf_event_context *ctx = NULL;
int rotate = 0;
- if (!atomic_read(&nr_events))
- return;
+ cpuctx = container_of(timer, struct perf_cpu_context, timer);
- cpuctx = &__get_cpu_var(perf_cpu_context);
- if (cpuctx->ctx.nr_events &&
- cpuctx->ctx.nr_events != cpuctx->ctx.nr_active)
- rotate = 1;
+ if (cpuctx->ctx.nr_events) {
+ restart = HRTIMER_RESTART;
+ if (cpuctx->ctx.nr_events != cpuctx->ctx.nr_active)
+ rotate = 1;
+ }
- ctx = curr->perf_event_ctxp;
- if (ctx && ctx->nr_events && ctx->nr_events != ctx->nr_active)
- rotate = 1;
+ ctx = cpuctx->task_ctx;
+ if (ctx && ctx->nr_events) {
+ restart = HRTIMER_RESTART;
+ if (ctx->nr_events != ctx->nr_active)
+ rotate = 1;
+ }
- perf_ctx_adjust_freq(&cpuctx->ctx);
+ perf_pmu_disable(cpuctx->ctx.pmu);
+ perf_ctx_adjust_freq(&cpuctx->ctx, cpuctx->timer_interval);
if (ctx)
- perf_ctx_adjust_freq(ctx);
+ perf_ctx_adjust_freq(ctx, cpuctx->timer_interval);
if (!rotate)
- return;
+ goto done;
- perf_disable();
cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
if (ctx)
task_ctx_sched_out(ctx, EVENT_FLEXIBLE);
@@ -1662,8 +1651,13 @@ void perf_event_task_tick(struct task_struct *curr)
cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
if (ctx)
- task_ctx_sched_in(curr, EVENT_FLEXIBLE);
- perf_enable();
+ task_ctx_sched_in(ctx, EVENT_FLEXIBLE);
+
+done:
+ perf_pmu_enable(cpuctx->ctx.pmu);
+ hrtimer_forward_now(timer, ns_to_ktime(cpuctx->timer_interval));
+
+ return restart;
}
static int event_enable_on_exec(struct perf_event *event,
@@ -1685,20 +1679,18 @@ static int event_enable_on_exec(struct perf_event *event,
* Enable all of a task's events that have been marked enable-on-exec.
* This expects task == current.
*/
-static void perf_event_enable_on_exec(struct task_struct *task)
+static void perf_event_enable_on_exec(struct perf_event_context *ctx)
{
- struct perf_event_context *ctx;
struct perf_event *event;
unsigned long flags;
int enabled = 0;
int ret;
local_irq_save(flags);
- ctx = task->perf_event_ctxp;
if (!ctx || !ctx->nr_events)
goto out;
- __perf_event_task_sched_out(ctx);
+ task_ctx_sched_out(ctx, EVENT_ALL);
raw_spin_lock(&ctx->lock);
@@ -1722,8 +1714,8 @@ static void perf_event_enable_on_exec(struct task_struct *task)
raw_spin_unlock(&ctx->lock);
- perf_event_task_sched_in(task);
- out:
+ perf_event_context_sched_in(ctx);
+out:
local_irq_restore(flags);
}
@@ -1732,9 +1724,9 @@ static void perf_event_enable_on_exec(struct task_struct *task)
*/
static void __perf_event_read(void *info)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_event *event = info;
struct perf_event_context *ctx = event->ctx;
+ struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
/*
* If this is a task context, we need to check whether it is
@@ -1782,11 +1774,219 @@ static u64 perf_event_read(struct perf_event *event)
}
/*
- * Initialize the perf_event context in a task_struct:
+ * Callchain support
*/
+
+struct callchain_cpus_entries {
+ struct rcu_head rcu_head;
+ struct perf_callchain_entry *cpu_entries[0];
+};
+
+static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]);
+static atomic_t nr_callchain_events;
+static DEFINE_MUTEX(callchain_mutex);
+struct callchain_cpus_entries *callchain_cpus_entries;
+
+
+__weak void perf_callchain_kernel(struct perf_callchain_entry *entry,
+ struct pt_regs *regs)
+{
+}
+
+__weak void perf_callchain_user(struct perf_callchain_entry *entry,
+ struct pt_regs *regs)
+{
+}
+
+static void release_callchain_buffers_rcu(struct rcu_head *head)
+{
+ struct callchain_cpus_entries *entries;
+ int cpu;
+
+ entries = container_of(head, struct callchain_cpus_entries, rcu_head);
+
+ for_each_possible_cpu(cpu)
+ kfree(entries->cpu_entries[cpu]);
+
+ kfree(entries);
+}
+
+static void release_callchain_buffers(void)
+{
+ struct callchain_cpus_entries *entries;
+
+ entries = callchain_cpus_entries;
+ rcu_assign_pointer(callchain_cpus_entries, NULL);
+ call_rcu(&entries->rcu_head, release_callchain_buffers_rcu);
+}
+
+static int alloc_callchain_buffers(void)
+{
+ int cpu;
+ int size;
+ struct callchain_cpus_entries *entries;
+
+ /*
+ * We can't use the percpu allocation API for data that can be
+ * accessed from NMI. Use a temporary manual per cpu allocation
+ * until that gets sorted out.
+ */
+ size = sizeof(*entries) + sizeof(struct perf_callchain_entry *) *
+ num_possible_cpus();
+
+ entries = kzalloc(size, GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ size = sizeof(struct perf_callchain_entry) * PERF_NR_CONTEXTS;
+
+ for_each_possible_cpu(cpu) {
+ entries->cpu_entries[cpu] = kmalloc_node(size, GFP_KERNEL,
+ cpu_to_node(cpu));
+ if (!entries->cpu_entries[cpu])
+ goto fail;
+ }
+
+ rcu_assign_pointer(callchain_cpus_entries, entries);
+
+ return 0;
+
+fail:
+ for_each_possible_cpu(cpu)
+ kfree(entries->cpu_entries[cpu]);
+ kfree(entries);
+
+ return -ENOMEM;
+}
+
+static int get_callchain_buffers(void)
+{
+ int err = 0;
+ int count;
+
+ mutex_lock(&callchain_mutex);
+
+ count = atomic_inc_return(&nr_callchain_events);
+ if (WARN_ON_ONCE(count < 1)) {
+ err = -EINVAL;
+ goto exit;
+ }
+
+ if (count > 1) {
+ /* If the allocation failed, give up */
+ if (!callchain_cpus_entries)
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ err = alloc_callchain_buffers();
+ if (err)
+ release_callchain_buffers();
+exit:
+ mutex_unlock(&callchain_mutex);
+
+ return err;
+}
+
+static void put_callchain_buffers(void)
+{
+ if (atomic_dec_and_mutex_lock(&nr_callchain_events, &callchain_mutex)) {
+ release_callchain_buffers();
+ mutex_unlock(&callchain_mutex);
+ }
+}
+
+static int get_recursion_context(int *recursion)
+{
+ int rctx;
+
+ if (in_nmi())
+ rctx = 3;
+ else if (in_irq())
+ rctx = 2;
+ else if (in_softirq())
+ rctx = 1;
+ else
+ rctx = 0;
+
+ if (recursion[rctx])
+ return -1;
+
+ recursion[rctx]++;
+ barrier();
+
+ return rctx;
+}
+
+static inline void put_recursion_context(int *recursion, int rctx)
+{
+ barrier();
+ recursion[rctx]--;
+}
+
+static struct perf_callchain_entry *get_callchain_entry(int *rctx)
+{
+ int cpu;
+ struct callchain_cpus_entries *entries;
+
+ *rctx = get_recursion_context(__get_cpu_var(callchain_recursion));
+ if (*rctx == -1)
+ return NULL;
+
+ entries = rcu_dereference(callchain_cpus_entries);
+ if (!entries)
+ return NULL;
+
+ cpu = smp_processor_id();
+
+ return &entries->cpu_entries[cpu][*rctx];
+}
+
static void
-__perf_event_init_context(struct perf_event_context *ctx,
- struct task_struct *task)
+put_callchain_entry(int rctx)
+{
+ put_recursion_context(__get_cpu_var(callchain_recursion), rctx);
+}
+
+static struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
+{
+ int rctx;
+ struct perf_callchain_entry *entry;
+
+
+ entry = get_callchain_entry(&rctx);
+ if (rctx == -1)
+ return NULL;
+
+ if (!entry)
+ goto exit_put;
+
+ entry->nr = 0;
+
+ if (!user_mode(regs)) {
+ perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
+ perf_callchain_kernel(entry, regs);
+ if (current->mm)
+ regs = task_pt_regs(current);
+ else
+ regs = NULL;
+ }
+
+ if (regs) {
+ perf_callchain_store(entry, PERF_CONTEXT_USER);
+ perf_callchain_user(entry, regs);
+ }
+
+exit_put:
+ put_callchain_entry(rctx);
+
+ return entry;
+}
+
+/*
+ * Initialize the perf_event context in a task_struct:
+ */
+static void __perf_event_init_context(struct perf_event_context *ctx)
{
raw_spin_lock_init(&ctx->lock);
mutex_init(&ctx->mutex);
@@ -1794,16 +1994,35 @@ __perf_event_init_context(struct perf_event_context *ctx,
INIT_LIST_HEAD(&ctx->flexible_groups);
INIT_LIST_HEAD(&ctx->event_list);
atomic_set(&ctx->refcount, 1);
- ctx->task = task;
}
-static struct perf_event_context *find_get_context(pid_t pid, int cpu)
+static struct perf_event_context *
+alloc_perf_context(struct pmu *pmu, struct task_struct *task)
+{
+ struct perf_event_context *ctx;
+
+ ctx = kzalloc(sizeof(struct perf_event_context), GFP_KERNEL);
+ if (!ctx)
+ return NULL;
+
+ __perf_event_init_context(ctx);
+ if (task) {
+ ctx->task = task;
+ get_task_struct(task);
+ }
+ ctx->pmu = pmu;
+
+ return ctx;
+}
+
+static struct perf_event_context *
+find_get_context(struct pmu *pmu, pid_t pid, int cpu)
{
struct perf_event_context *ctx;
struct perf_cpu_context *cpuctx;
struct task_struct *task;
unsigned long flags;
- int err;
+ int ctxn, err;
if (pid == -1 && cpu != -1) {
/* Must be root to operate on a CPU event: */
@@ -1821,7 +2040,7 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
if (!cpu_online(cpu))
return ERR_PTR(-ENODEV);
- cpuctx = &per_cpu(perf_cpu_context, cpu);
+ cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
ctx = &cpuctx->ctx;
get_ctx(ctx);
@@ -1852,35 +2071,41 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto errout;
- retry:
- ctx = perf_lock_task_context(task, &flags);
+ err = -EINVAL;
+ ctxn = pmu->task_ctx_nr;
+ if (ctxn < 0)
+ goto errout;
+
+retry:
+ ctx = perf_lock_task_context(task, ctxn, &flags);
if (ctx) {
unclone_ctx(ctx);
raw_spin_unlock_irqrestore(&ctx->lock, flags);
}
if (!ctx) {
- ctx = kzalloc(sizeof(struct perf_event_context), GFP_KERNEL);
+ ctx = alloc_perf_context(pmu, task);
err = -ENOMEM;
if (!ctx)
goto errout;
- __perf_event_init_context(ctx, task);
+
get_ctx(ctx);
- if (cmpxchg(&task->perf_event_ctxp, NULL, ctx)) {
+
+ if (cmpxchg(&task->perf_event_ctxp[ctxn], NULL, ctx)) {
/*
* We raced with some other task; use
* the context they set.
*/
+ put_task_struct(task);
kfree(ctx);
goto retry;
}
- get_task_struct(task);
}
put_task_struct(task);
return ctx;
- errout:
+errout:
put_task_struct(task);
return ERR_PTR(err);
}
@@ -1913,6 +2138,8 @@ static void free_event(struct perf_event *event)
atomic_dec(&nr_comm_events);
if (event->attr.task)
atomic_dec(&nr_task_events);
+ if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)
+ put_callchain_buffers();
}
if (event->buffer) {
@@ -1923,7 +2150,9 @@ static void free_event(struct perf_event *event)
if (event->destroy)
event->destroy(event);
- put_ctx(event->ctx);
+ if (event->ctx)
+ put_ctx(event->ctx);
+
call_rcu(&event->rcu_head, free_event_rcu);
}
@@ -2344,6 +2573,9 @@ int perf_event_task_disable(void)
static int perf_event_index(struct perf_event *event)
{
+ if (event->hw.state & PERF_HES_STOPPED)
+ return 0;
+
if (event->state != PERF_EVENT_STATE_ACTIVE)
return 0;
@@ -2956,16 +3188,6 @@ void perf_event_do_pending(void)
}
/*
- * Callchain support -- arch specific
- */
-
-__weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
-{
- return NULL;
-}
-
-
-/*
* We assume there is only KVM supporting the callbacks.
* Later on, we might change it to a list if there is
* another virtualization implementation supporting the callbacks.
@@ -3071,7 +3293,7 @@ again:
if (handle->wakeup != local_read(&buffer->wakeup))
perf_output_wakeup(handle);
- out:
+out:
preempt_enable();
}
@@ -3459,14 +3681,20 @@ static void perf_event_output(struct perf_event *event, int nmi,
struct perf_output_handle handle;
struct perf_event_header header;
+ /* protect the callchain buffers */
+ rcu_read_lock();
+
perf_prepare_sample(&header, data, event, regs);
if (perf_output_begin(&handle, event, header.size, nmi, 1))
- return;
+ goto exit;
perf_output_sample(&handle, &header, data, event);
perf_output_end(&handle);
+
+exit:
+ rcu_read_unlock();
}
/*
@@ -3580,16 +3808,25 @@ static void perf_event_task_ctx(struct perf_event_context *ctx,
static void perf_event_task_event(struct perf_task_event *task_event)
{
struct perf_cpu_context *cpuctx;
- struct perf_event_context *ctx = task_event->task_ctx;
+ struct perf_event_context *ctx;
+ struct pmu *pmu;
+ int ctxn;
rcu_read_lock();
- cpuctx = &get_cpu_var(perf_cpu_context);
- perf_event_task_ctx(&cpuctx->ctx, task_event);
- if (!ctx)
- ctx = rcu_dereference(current->perf_event_ctxp);
- if (ctx)
- perf_event_task_ctx(ctx, task_event);
- put_cpu_var(perf_cpu_context);
+ list_for_each_entry_rcu(pmu, &pmus, entry) {
+ cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ perf_event_task_ctx(&cpuctx->ctx, task_event);
+
+ ctx = task_event->task_ctx;
+ if (!ctx) {
+ ctxn = pmu->task_ctx_nr;
+ if (ctxn < 0)
+ continue;
+ ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
+ }
+ if (ctx)
+ perf_event_task_ctx(ctx, task_event);
+ }
rcu_read_unlock();
}
@@ -3694,8 +3931,10 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
{
struct perf_cpu_context *cpuctx;
struct perf_event_context *ctx;
- unsigned int size;
char comm[TASK_COMM_LEN];
+ unsigned int size;
+ struct pmu *pmu;
+ int ctxn;
memset(comm, 0, sizeof(comm));
strlcpy(comm, comm_event->task->comm, sizeof(comm));
@@ -3707,21 +3946,34 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
comm_event->event_id.header.size = sizeof(comm_event->event_id) + size;
rcu_read_lock();
- cpuctx = &get_cpu_var(perf_cpu_context);
- perf_event_comm_ctx(&cpuctx->ctx, comm_event);
- ctx = rcu_dereference(current->perf_event_ctxp);
- if (ctx)
- perf_event_comm_ctx(ctx, comm_event);
- put_cpu_var(perf_cpu_context);
+ list_for_each_entry_rcu(pmu, &pmus, entry) {
+ cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ perf_event_comm_ctx(&cpuctx->ctx, comm_event);
+
+ ctxn = pmu->task_ctx_nr;
+ if (ctxn < 0)
+ continue;
+
+ ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
+ if (ctx)
+ perf_event_comm_ctx(ctx, comm_event);
+ }
rcu_read_unlock();
}
void perf_event_comm(struct task_struct *task)
{
struct perf_comm_event comm_event;
+ struct perf_event_context *ctx;
+ int ctxn;
+
+ for_each_task_context_nr(ctxn) {
+ ctx = task->perf_event_ctxp[ctxn];
+ if (!ctx)
+ continue;
- if (task->perf_event_ctxp)
- perf_event_enable_on_exec(task);
+ perf_event_enable_on_exec(ctx);
+ }
if (!atomic_read(&nr_comm_events))
return;
@@ -3823,6 +4075,8 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
char tmp[16];
char *buf = NULL;
const char *name;
+ struct pmu *pmu;
+ int ctxn;
memset(tmp, 0, sizeof(tmp));
@@ -3875,12 +4129,21 @@ got_name:
mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
rcu_read_lock();
- cpuctx = &get_cpu_var(perf_cpu_context);
- perf_event_mmap_ctx(&cpuctx->ctx, mmap_event, vma->vm_flags & VM_EXEC);
- ctx = rcu_dereference(current->perf_event_ctxp);
- if (ctx)
- perf_event_mmap_ctx(ctx, mmap_event, vma->vm_flags & VM_EXEC);
- put_cpu_var(perf_cpu_context);
+ list_for_each_entry_rcu(pmu, &pmus, entry) {
+ cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ perf_event_mmap_ctx(&cpuctx->ctx, mmap_event,
+ vma->vm_flags & VM_EXEC);
+
+ ctxn = pmu->task_ctx_nr;
+ if (ctxn < 0)
+ continue;
+
+ ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
+ if (ctx) {
+ perf_event_mmap_ctx(ctx, mmap_event,
+ vma->vm_flags & VM_EXEC);
+ }
+ }
rcu_read_unlock();
kfree(buf);
@@ -3962,8 +4225,6 @@ static int __perf_event_overflow(struct perf_event *event, int nmi,
struct hw_perf_event *hwc = &event->hw;
int ret = 0;
- throttle = (throttle && event->pmu->unthrottle != NULL);
-
if (!throttle) {
hwc->interrupts++;
} else {
@@ -4031,6 +4292,17 @@ int perf_event_overflow(struct perf_event *event, int nmi,
* Generic software event infrastructure
*/
+struct swevent_htable {
+ struct swevent_hlist *swevent_hlist;
+ struct mutex hlist_mutex;
+ int hlist_refcount;
+
+ /* Recursion avoidance in each contexts */
+ int recursion[PERF_NR_CONTEXTS];
+};
+
+static DEFINE_PER_CPU(struct swevent_htable, swevent_htable);
+
/*
* We directly increment event->count and keep a second value in
* event->hw.period_left to count intervals. This period event
@@ -4088,7 +4360,7 @@ static void perf_swevent_overflow(struct perf_event *event, u64 overflow,
}
}
-static void perf_swevent_add(struct perf_event *event, u64 nr,
+static void perf_swevent_event(struct perf_event *event, u64 nr,
int nmi, struct perf_sample_data *data,
struct pt_regs *regs)
{
@@ -4114,6 +4386,9 @@ static void perf_swevent_add(struct perf_event *event, u64 nr,
static int perf_exclude_event(struct perf_event *event,
struct pt_regs *regs)
{
+ if (event->hw.state & PERF_HES_STOPPED)
+ return 0;
+
if (regs) {
if (event->attr.exclude_user && user_mode(regs))
return 1;
@@ -4160,11 +4435,11 @@ __find_swevent_head(struct swevent_hlist *hlist, u64 type, u32 event_id)
/* For the read side: events when they trigger */
static inline struct hlist_head *
-find_swevent_head_rcu(struct perf_cpu_context *ctx, u64 type, u32 event_id)
+find_swevent_head_rcu(struct swevent_htable *swhash, u64 type, u32 event_id)
{
struct swevent_hlist *hlist;
- hlist = rcu_dereference(ctx->swevent_hlist);
+ hlist = rcu_dereference(swhash->swevent_hlist);
if (!hlist)
return NULL;
@@ -4173,7 +4448,7 @@ find_swevent_head_rcu(struct perf_cpu_context *ctx, u64 type, u32 event_id)
/* For the event head insertion and removal in the hlist */
static inline struct hlist_head *
-find_swevent_head(struct perf_cpu_context *ctx, struct perf_event *event)
+find_swevent_head(struct swevent_htable *swhash, struct perf_event *event)
{
struct swevent_hlist *hlist;
u32 event_id = event->attr.config;
@@ -4184,7 +4459,7 @@ find_swevent_head(struct perf_cpu_context *ctx, struct perf_event *event)
* and release. Which makes the protected version suitable here.
* The context lock guarantees that.
*/
- hlist = rcu_dereference_protected(ctx->swevent_hlist,
+ hlist = rcu_dereference_protected(swhash->swevent_hlist,
lockdep_is_held(&event->ctx->lock));
if (!hlist)
return NULL;
@@ -4197,23 +4472,19 @@ static void do_perf_sw_event(enum perf_type_id type, u32 event_id,
struct perf_sample_data *data,
struct pt_regs *regs)
{
- struct perf_cpu_context *cpuctx;
+ struct swevent_htable *swhash = &__get_cpu_var(swevent_htable);
struct perf_event *event;
struct hlist_node *node;
struct hlist_head *head;
- cpuctx = &__get_cpu_var(perf_cpu_context);
-
rcu_read_lock();
-
- head = find_swevent_head_rcu(cpuctx, type, event_id);
-
+ head = find_swevent_head_rcu(swhash, type, event_id);
if (!head)
goto end;
hlist_for_each_entry_rcu(event, node, head, hlist_entry) {
if (perf_swevent_match(event, type, event_id, data, regs))
- perf_swevent_add(event, nr, nmi, data, regs);
+ perf_swevent_event(event, nr, nmi, data, regs);
}
end:
rcu_read_unlock();
@@ -4221,33 +4492,17 @@ end:
int perf_swevent_get_recursion_context(void)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- int rctx;
+ struct swevent_htable *swhash = &__get_cpu_var(swevent_htable);
- if (in_nmi())
- rctx = 3;
- else if (in_irq())
- rctx = 2;
- else if (in_softirq())
- rctx = 1;
- else
- rctx = 0;
-
- if (cpuctx->recursion[rctx])
- return -1;
-
- cpuctx->recursion[rctx]++;
- barrier();
-
- return rctx;
+ return get_recursion_context(swhash->recursion);
}
EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context);
void inline perf_swevent_put_recursion_context(int rctx)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- barrier();
- cpuctx->recursion[rctx]--;
+ struct swevent_htable *swhash = &__get_cpu_var(swevent_htable);
+
+ put_recursion_context(swhash->recursion, rctx);
}
void __perf_sw_event(u32 event_id, u64 nr, int nmi,
@@ -4273,20 +4528,20 @@ static void perf_swevent_read(struct perf_event *event)
{
}
-static int perf_swevent_enable(struct perf_event *event)
+static int perf_swevent_add(struct perf_event *event, int flags)
{
+ struct swevent_htable *swhash = &__get_cpu_var(swevent_htable);
struct hw_perf_event *hwc = &event->hw;
- struct perf_cpu_context *cpuctx;
struct hlist_head *head;
- cpuctx = &__get_cpu_var(perf_cpu_context);
-
if (hwc->sample_period) {
hwc->last_period = hwc->sample_period;
perf_swevent_set_period(event);
}
- head = find_swevent_head(cpuctx, event);
+ hwc->state = !(flags & PERF_EF_START);
+
+ head = find_swevent_head(swhash, event);
if (WARN_ON_ONCE(!head))
return -EINVAL;
@@ -4295,202 +4550,27 @@ static int perf_swevent_enable(struct perf_event *event)
return 0;
}
-static void perf_swevent_disable(struct perf_event *event)
+static void perf_swevent_del(struct perf_event *event, int flags)
{
hlist_del_rcu(&event->hlist_entry);
}
-static void perf_swevent_void(struct perf_event *event)
+static void perf_swevent_start(struct perf_event *event, int flags)
{
+ event->hw.state = 0;
}
-static int perf_swevent_int(struct perf_event *event)
+static void perf_swevent_stop(struct perf_event *event, int flags)
{
- return 0;
+ event->hw.state = PERF_HES_STOPPED;
}
-static const struct pmu perf_ops_generic = {
- .enable = perf_swevent_enable,
- .disable = perf_swevent_disable,
- .start = perf_swevent_int,
- .stop = perf_swevent_void,
- .read = perf_swevent_read,
- .unthrottle = perf_swevent_void, /* hwc->interrupts already reset */
-};
-
-/*
- * hrtimer based swevent callback
- */
-
-static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
-{
- enum hrtimer_restart ret = HRTIMER_RESTART;
- struct perf_sample_data data;
- struct pt_regs *regs;
- struct perf_event *event;
- u64 period;
-
- event = container_of(hrtimer, struct perf_event, hw.hrtimer);
- event->pmu->read(event);
-
- perf_sample_data_init(&data, 0);
- data.period = event->hw.last_period;
- regs = get_irq_regs();
-
- if (regs && !perf_exclude_event(event, regs)) {
- if (!(event->attr.exclude_idle && current->pid == 0))
- if (perf_event_overflow(event, 0, &data, regs))
- ret = HRTIMER_NORESTART;
- }
-
- period = max_t(u64, 10000, event->hw.sample_period);
- hrtimer_forward_now(hrtimer, ns_to_ktime(period));
-
- return ret;
-}
-
-static void perf_swevent_start_hrtimer(struct perf_event *event)
-{
- struct hw_perf_event *hwc = &event->hw;
-
- hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- hwc->hrtimer.function = perf_swevent_hrtimer;
- if (hwc->sample_period) {
- u64 period;
-
- if (hwc->remaining) {
- if (hwc->remaining < 0)
- period = 10000;
- else
- period = hwc->remaining;
- hwc->remaining = 0;
- } else {
- period = max_t(u64, 10000, hwc->sample_period);
- }
- __hrtimer_start_range_ns(&hwc->hrtimer,
- ns_to_ktime(period), 0,
- HRTIMER_MODE_REL, 0);
- }
-}
-
-static void perf_swevent_cancel_hrtimer(struct perf_event *event)
-{
- struct hw_perf_event *hwc = &event->hw;
-
- if (hwc->sample_period) {
- ktime_t remaining = hrtimer_get_remaining(&hwc->hrtimer);
- hwc->remaining = ktime_to_ns(remaining);
-
- hrtimer_cancel(&hwc->hrtimer);
- }
-}
-
-/*
- * Software event: cpu wall time clock
- */
-
-static void cpu_clock_perf_event_update(struct perf_event *event)
-{
- int cpu = raw_smp_processor_id();
- s64 prev;
- u64 now;
-
- now = cpu_clock(cpu);
- prev = local64_xchg(&event->hw.prev_count, now);
- local64_add(now - prev, &event->count);
-}
-
-static int cpu_clock_perf_event_enable(struct perf_event *event)
-{
- struct hw_perf_event *hwc = &event->hw;
- int cpu = raw_smp_processor_id();
-
- local64_set(&hwc->prev_count, cpu_clock(cpu));
- perf_swevent_start_hrtimer(event);
-
- return 0;
-}
-
-static void cpu_clock_perf_event_disable(struct perf_event *event)
-{
- perf_swevent_cancel_hrtimer(event);
- cpu_clock_perf_event_update(event);
-}
-
-static void cpu_clock_perf_event_read(struct perf_event *event)
-{
- cpu_clock_perf_event_update(event);
-}
-
-static const struct pmu perf_ops_cpu_clock = {
- .enable = cpu_clock_perf_event_enable,
- .disable = cpu_clock_perf_event_disable,
- .read = cpu_clock_perf_event_read,
-};
-
-/*
- * Software event: task time clock
- */
-
-static void task_clock_perf_event_update(struct perf_event *event, u64 now)
-{
- u64 prev;
- s64 delta;
-
- prev = local64_xchg(&event->hw.prev_count, now);
- delta = now - prev;
- local64_add(delta, &event->count);
-}
-
-static int task_clock_perf_event_enable(struct perf_event *event)
-{
- struct hw_perf_event *hwc = &event->hw;
- u64 now;
-
- now = event->ctx->time;
-
- local64_set(&hwc->prev_count, now);
-
- perf_swevent_start_hrtimer(event);
-
- return 0;
-}
-
-static void task_clock_perf_event_disable(struct perf_event *event)
-{
- perf_swevent_cancel_hrtimer(event);
- task_clock_perf_event_update(event, event->ctx->time);
-
-}
-
-static void task_clock_perf_event_read(struct perf_event *event)
-{
- u64 time;
-
- if (!in_nmi()) {
- update_context_time(event->ctx);
- time = event->ctx->time;
- } else {
- u64 now = perf_clock();
- u64 delta = now - event->ctx->timestamp;
- time = event->ctx->time + delta;
- }
-
- task_clock_perf_event_update(event, time);
-}
-
-static const struct pmu perf_ops_task_clock = {
- .enable = task_clock_perf_event_enable,
- .disable = task_clock_perf_event_disable,
- .read = task_clock_perf_event_read,
-};
-
/* Deref the hlist from the update side */
static inline struct swevent_hlist *
-swevent_hlist_deref(struct perf_cpu_context *cpuctx)
+swevent_hlist_deref(struct swevent_htable *swhash)
{
- return rcu_dereference_protected(cpuctx->swevent_hlist,
- lockdep_is_held(&cpuctx->hlist_mutex));
+ return rcu_dereference_protected(swhash->swevent_hlist,
+ lockdep_is_held(&swhash->hlist_mutex));
}
static void swevent_hlist_release_rcu(struct rcu_head *rcu_head)
@@ -4501,27 +4581,27 @@ static void swevent_hlist_release_rcu(struct rcu_head *rcu_head)
kfree(hlist);
}
-static void swevent_hlist_release(struct perf_cpu_context *cpuctx)
+static void swevent_hlist_release(struct swevent_htable *swhash)
{
- struct swevent_hlist *hlist = swevent_hlist_deref(cpuctx);
+ struct swevent_hlist *hlist = swevent_hlist_deref(swhash);
if (!hlist)
return;
- rcu_assign_pointer(cpuctx->swevent_hlist, NULL);
+ rcu_assign_pointer(swhash->swevent_hlist, NULL);
call_rcu(&hlist->rcu_head, swevent_hlist_release_rcu);
}
static void swevent_hlist_put_cpu(struct perf_event *event, int cpu)
{
- struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+ struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu);
- mutex_lock(&cpuctx->hlist_mutex);
+ mutex_lock(&swhash->hlist_mutex);
- if (!--cpuctx->hlist_refcount)
- swevent_hlist_release(cpuctx);
+ if (!--swhash->hlist_refcount)
+ swevent_hlist_release(swhash);
- mutex_unlock(&cpuctx->hlist_mutex);
+ mutex_unlock(&swhash->hlist_mutex);
}
static void swevent_hlist_put(struct perf_event *event)
@@ -4539,12 +4619,12 @@ static void swevent_hlist_put(struct perf_event *event)
static int swevent_hlist_get_cpu(struct perf_event *event, int cpu)
{
- struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+ struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu);
int err = 0;
- mutex_lock(&cpuctx->hlist_mutex);
+ mutex_lock(&swhash->hlist_mutex);
- if (!swevent_hlist_deref(cpuctx) && cpu_online(cpu)) {
+ if (!swevent_hlist_deref(swhash) && cpu_online(cpu)) {
struct swevent_hlist *hlist;
hlist = kzalloc(sizeof(*hlist), GFP_KERNEL);
@@ -4552,11 +4632,11 @@ static int swevent_hlist_get_cpu(struct perf_event *event, int cpu)
err = -ENOMEM;
goto exit;
}
- rcu_assign_pointer(cpuctx->swevent_hlist, hlist);
+ rcu_assign_pointer(swhash->swevent_hlist, hlist);
}
- cpuctx->hlist_refcount++;
- exit:
- mutex_unlock(&cpuctx->hlist_mutex);
+ swhash->hlist_refcount++;
+exit:
+ mutex_unlock(&swhash->hlist_mutex);
return err;
}
@@ -4580,7 +4660,7 @@ static int swevent_hlist_get(struct perf_event *event)
put_online_cpus();
return 0;
- fail:
+fail:
for_each_possible_cpu(cpu) {
if (cpu == failed_cpu)
break;
@@ -4591,17 +4671,64 @@ static int swevent_hlist_get(struct perf_event *event)
return err;
}
-#ifdef CONFIG_EVENT_TRACING
+atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
+
+static void sw_perf_event_destroy(struct perf_event *event)
+{
+ u64 event_id = event->attr.config;
+
+ WARN_ON(event->parent);
+
+ atomic_dec(&perf_swevent_enabled[event_id]);
+ swevent_hlist_put(event);
+}
+
+static int perf_swevent_init(struct perf_event *event)
+{
+ int event_id = event->attr.config;
+
+ if (event->attr.type != PERF_TYPE_SOFTWARE)
+ return -ENOENT;
+
+ switch (event_id) {
+ case PERF_COUNT_SW_CPU_CLOCK:
+ case PERF_COUNT_SW_TASK_CLOCK:
+ return -ENOENT;
+
+ default:
+ break;
+ }
+
+ if (event_id > PERF_COUNT_SW_MAX)
+ return -ENOENT;
+
+ if (!event->parent) {
+ int err;
+
+ err = swevent_hlist_get(event);
+ if (err)
+ return err;
-static const struct pmu perf_ops_tracepoint = {
- .enable = perf_trace_enable,
- .disable = perf_trace_disable,
- .start = perf_swevent_int,
- .stop = perf_swevent_void,
+ atomic_inc(&perf_swevent_enabled[event_id]);
+ event->destroy = sw_perf_event_destroy;
+ }
+
+ return 0;
+}
+
+static struct pmu perf_swevent = {
+ .task_ctx_nr = perf_sw_context,
+
+ .event_init = perf_swevent_init,
+ .add = perf_swevent_add,
+ .del = perf_swevent_del,
+ .start = perf_swevent_start,
+ .stop = perf_swevent_stop,
.read = perf_swevent_read,
- .unthrottle = perf_swevent_void,
};
+#ifdef CONFIG_EVENT_TRACING
+
static int perf_tp_filter_match(struct perf_event *event,
struct perf_sample_data *data)
{
@@ -4645,7 +4772,7 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
hlist_for_each_entry_rcu(event, node, head, hlist_entry) {
if (perf_tp_event_match(event, &data, regs))
- perf_swevent_add(event, count, 1, &data, regs);
+ perf_swevent_event(event, count, 1, &data, regs);
}
perf_swevent_put_recursion_context(rctx);
@@ -4657,10 +4784,13 @@ static void tp_perf_event_destroy(struct perf_event *event)
perf_trace_destroy(event);
}
-static const struct pmu *tp_perf_event_init(struct perf_event *event)
+static int perf_tp_event_init(struct perf_event *event)
{
int err;
+ if (event->attr.type != PERF_TYPE_TRACEPOINT)
+ return -ENOENT;
+
/*
* Raw tracepoint data is a severe data leak, only allow root to
* have these.
@@ -4668,15 +4798,31 @@ static const struct pmu *tp_perf_event_init(struct perf_event *event)
if ((event->attr.sample_type & PERF_SAMPLE_RAW) &&
perf_paranoid_tracepoint_raw() &&
!capable(CAP_SYS_ADMIN))
- return ERR_PTR(-EPERM);
+ return -EPERM;
err = perf_trace_init(event);
if (err)
- return NULL;
+ return err;
event->destroy = tp_perf_event_destroy;
- return &perf_ops_tracepoint;
+ return 0;
+}
+
+static struct pmu perf_tracepoint = {
+ .task_ctx_nr = perf_sw_context,
+
+ .event_init = perf_tp_event_init,
+ .add = perf_trace_add,
+ .del = perf_trace_del,
+ .start = perf_swevent_start,
+ .stop = perf_swevent_stop,
+ .read = perf_swevent_read,
+};
+
+static inline void perf_tp_register(void)
+{
+ perf_pmu_register(&perf_tracepoint);
}
static int perf_event_set_filter(struct perf_event *event, void __user *arg)
@@ -4704,9 +4850,8 @@ static void perf_event_free_filter(struct perf_event *event)
#else
-static const struct pmu *tp_perf_event_init(struct perf_event *event)
+static inline void perf_tp_register(void)
{
- return NULL;
}
static int perf_event_set_filter(struct perf_event *event, void __user *arg)
@@ -4721,105 +4866,389 @@ static void perf_event_free_filter(struct perf_event *event)
#endif /* CONFIG_EVENT_TRACING */
#ifdef CONFIG_HAVE_HW_BREAKPOINT
-static void bp_perf_event_destroy(struct perf_event *event)
+void perf_bp_event(struct perf_event *bp, void *data)
{
- release_bp_slot(event);
+ struct perf_sample_data sample;
+ struct pt_regs *regs = data;
+
+ perf_sample_data_init(&sample, bp->attr.bp_addr);
+
+ if (!bp->hw.state && !perf_exclude_event(bp, regs))
+ perf_swevent_event(bp, 1, 1, &sample, regs);
}
+#endif
+
+/*
+ * hrtimer based swevent callback
+ */
-static const struct pmu *bp_perf_event_init(struct perf_event *bp)
+static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
{
- int err;
+ enum hrtimer_restart ret = HRTIMER_RESTART;
+ struct perf_sample_data data;
+ struct pt_regs *regs;
+ struct perf_event *event;
+ u64 period;
- err = register_perf_hw_breakpoint(bp);
- if (err)
- return ERR_PTR(err);
+ event = container_of(hrtimer, struct perf_event, hw.hrtimer);
+ event->pmu->read(event);
+
+ perf_sample_data_init(&data, 0);
+ data.period = event->hw.last_period;
+ regs = get_irq_regs();
+
+ if (regs && !perf_exclude_event(event, regs)) {
+ if (!(event->attr.exclude_idle && current->pid == 0))
+ if (perf_event_overflow(event, 0, &data, regs))
+ ret = HRTIMER_NORESTART;
+ }
- bp->destroy = bp_perf_event_destroy;
+ period = max_t(u64, 10000, event->hw.sample_period);
+ hrtimer_forward_now(hrtimer, ns_to_ktime(period));
- return &perf_ops_bp;
+ return ret;
}
-void perf_bp_event(struct perf_event *bp, void *data)
+static void perf_swevent_start_hrtimer(struct perf_event *event)
{
- struct perf_sample_data sample;
- struct pt_regs *regs = data;
+ struct hw_perf_event *hwc = &event->hw;
- perf_sample_data_init(&sample, bp->attr.bp_addr);
+ hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hwc->hrtimer.function = perf_swevent_hrtimer;
+ if (hwc->sample_period) {
+ s64 period = local64_read(&hwc->period_left);
+
+ if (period) {
+ if (period < 0)
+ period = 10000;
- if (!perf_exclude_event(bp, regs))
- perf_swevent_add(bp, 1, 1, &sample, regs);
+ local64_set(&hwc->period_left, 0);
+ } else {
+ period = max_t(u64, 10000, hwc->sample_period);
+ }
+ __hrtimer_start_range_ns(&hwc->hrtimer,
+ ns_to_ktime(period), 0,
+ HRTIMER_MODE_REL_PINNED, 0);
+ }
}
-#else
-static const struct pmu *bp_perf_event_init(struct perf_event *bp)
+
+static void perf_swevent_cancel_hrtimer(struct perf_event *event)
{
- return NULL;
+ struct hw_perf_event *hwc = &event->hw;
+
+ if (hwc->sample_period) {
+ ktime_t remaining = hrtimer_get_remaining(&hwc->hrtimer);
+ local64_set(&hwc->period_left, ktime_to_ns(remaining));
+
+ hrtimer_cancel(&hwc->hrtimer);
+ }
}
-void perf_bp_event(struct perf_event *bp, void *regs)
+/*
+ * Software event: cpu wall time clock
+ */
+
+static void cpu_clock_event_update(struct perf_event *event)
{
+ s64 prev;
+ u64 now;
+
+ now = local_clock();
+ prev = local64_xchg(&event->hw.prev_count, now);
+ local64_add(now - prev, &event->count);
}
-#endif
-atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
+static void cpu_clock_event_start(struct perf_event *event, int flags)
+{
+ local64_set(&event->hw.prev_count, local_clock());
+ perf_swevent_start_hrtimer(event);
+}
-static void sw_perf_event_destroy(struct perf_event *event)
+static void cpu_clock_event_stop(struct perf_event *event, int flags)
{
- u64 event_id = event->attr.config;
+ perf_swevent_cancel_hrtimer(event);
+ cpu_clock_event_update(event);
+}
- WARN_ON(event->parent);
+static int cpu_clock_event_add(struct perf_event *event, int flags)
+{
+ if (flags & PERF_EF_START)
+ cpu_clock_event_start(event, flags);
- atomic_dec(&perf_swevent_enabled[event_id]);
- swevent_hlist_put(event);
+ return 0;
}
-static const struct pmu *sw_perf_event_init(struct perf_event *event)
+static void cpu_clock_event_del(struct perf_event *event, int flags)
{
- const struct pmu *pmu = NULL;
- u64 event_id = event->attr.config;
+ cpu_clock_event_stop(event, flags);
+}
+
+static void cpu_clock_event_read(struct perf_event *event)
+{
+ cpu_clock_event_update(event);
+}
+
+static int cpu_clock_event_init(struct perf_event *event)
+{
+ if (event->attr.type != PERF_TYPE_SOFTWARE)
+ return -ENOENT;
+
+ if (event->attr.config != PERF_COUNT_SW_CPU_CLOCK)
+ return -ENOENT;
+
+ return 0;
+}
+
+static struct pmu perf_cpu_clock = {
+ .task_ctx_nr = perf_sw_context,
+
+ .event_init = cpu_clock_event_init,
+ .add = cpu_clock_event_add,
+ .del = cpu_clock_event_del,
+ .start = cpu_clock_event_start,
+ .stop = cpu_clock_event_stop,
+ .read = cpu_clock_event_read,
+};
+
+/*
+ * Software event: task time clock
+ */
+static void task_clock_event_update(struct perf_event *event, u64 now)
+{
+ u64 prev;
+ s64 delta;
+
+ prev = local64_xchg(&event->hw.prev_count, now);
+ delta = now - prev;
+ local64_add(delta, &event->count);
+}
+
+static void task_clock_event_start(struct perf_event *event, int flags)
+{
+ local64_set(&event->hw.prev_count, event->ctx->time);
+ perf_swevent_start_hrtimer(event);
+}
+
+static void task_clock_event_stop(struct perf_event *event, int flags)
+{
+ perf_swevent_cancel_hrtimer(event);
+ task_clock_event_update(event, event->ctx->time);
+}
+
+static int task_clock_event_add(struct perf_event *event, int flags)
+{
+ if (flags & PERF_EF_START)
+ task_clock_event_start(event, flags);
+
+ return 0;
+}
+
+static void task_clock_event_del(struct perf_event *event, int flags)
+{
+ task_clock_event_stop(event, PERF_EF_UPDATE);
+}
+
+static void task_clock_event_read(struct perf_event *event)
+{
+ u64 time;
+
+ if (!in_nmi()) {
+ update_context_time(event->ctx);
+ time = event->ctx->time;
+ } else {
+ u64 now = perf_clock();
+ u64 delta = now - event->ctx->timestamp;
+ time = event->ctx->time + delta;
+ }
+
+ task_clock_event_update(event, time);
+}
+
+static int task_clock_event_init(struct perf_event *event)
+{
+ if (event->attr.type != PERF_TYPE_SOFTWARE)
+ return -ENOENT;
+
+ if (event->attr.config != PERF_COUNT_SW_TASK_CLOCK)
+ return -ENOENT;
+
+ return 0;
+}
+
+static struct pmu perf_task_clock = {
+ .task_ctx_nr = perf_sw_context,
+
+ .event_init = task_clock_event_init,
+ .add = task_clock_event_add,
+ .del = task_clock_event_del,
+ .start = task_clock_event_start,
+ .stop = task_clock_event_stop,
+ .read = task_clock_event_read,
+};
+
+static void perf_pmu_nop_void(struct pmu *pmu)
+{
+}
+
+static int perf_pmu_nop_int(struct pmu *pmu)
+{
+ return 0;
+}
+
+static void perf_pmu_start_txn(struct pmu *pmu)
+{
+ perf_pmu_disable(pmu);
+}
+
+static int perf_pmu_commit_txn(struct pmu *pmu)
+{
+ perf_pmu_enable(pmu);
+ return 0;
+}
+
+static void perf_pmu_cancel_txn(struct pmu *pmu)
+{
+ perf_pmu_enable(pmu);
+}
+
+/*
+ * Ensures all contexts with the same task_ctx_nr have the same
+ * pmu_cpu_context too.
+ */
+static void *find_pmu_context(int ctxn)
+{
+ struct pmu *pmu;
+
+ if (ctxn < 0)
+ return NULL;
+
+ list_for_each_entry(pmu, &pmus, entry) {
+ if (pmu->task_ctx_nr == ctxn)
+ return pmu->pmu_cpu_context;
+ }
+
+ return NULL;
+}
+
+static void free_pmu_context(void * __percpu cpu_context)
+{
+ struct pmu *pmu;
+
+ mutex_lock(&pmus_lock);
/*
- * Software events (currently) can't in general distinguish
- * between user, kernel and hypervisor events.
- * However, context switches and cpu migrations are considered
- * to be kernel events, and page faults are never hypervisor
- * events.
+ * Like a real lame refcount.
*/
- switch (event_id) {
- case PERF_COUNT_SW_CPU_CLOCK:
- pmu = &perf_ops_cpu_clock;
+ list_for_each_entry(pmu, &pmus, entry) {
+ if (pmu->pmu_cpu_context == cpu_context)
+ goto out;
+ }
- break;
- case PERF_COUNT_SW_TASK_CLOCK:
- /*
- * If the user instantiates this as a per-cpu event,
- * use the cpu_clock event instead.
- */
- if (event->ctx->task)
- pmu = &perf_ops_task_clock;
- else
- pmu = &perf_ops_cpu_clock;
+ free_percpu(cpu_context);
+out:
+ mutex_unlock(&pmus_lock);
+}
- break;
- case PERF_COUNT_SW_PAGE_FAULTS:
- case PERF_COUNT_SW_PAGE_FAULTS_MIN:
- case PERF_COUNT_SW_PAGE_FAULTS_MAJ:
- case PERF_COUNT_SW_CONTEXT_SWITCHES:
- case PERF_COUNT_SW_CPU_MIGRATIONS:
- case PERF_COUNT_SW_ALIGNMENT_FAULTS:
- case PERF_COUNT_SW_EMULATION_FAULTS:
- if (!event->parent) {
- int err;
-
- err = swevent_hlist_get(event);
- if (err)
- return ERR_PTR(err);
+int perf_pmu_register(struct pmu *pmu)
+{
+ int cpu, ret;
+
+ mutex_lock(&pmus_lock);
+ ret = -ENOMEM;
+ pmu->pmu_disable_count = alloc_percpu(int);
+ if (!pmu->pmu_disable_count)
+ goto unlock;
+
+ pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr);
+ if (pmu->pmu_cpu_context)
+ goto got_cpu_context;
+
+ pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
+ if (!pmu->pmu_cpu_context)
+ goto free_pdc;
+
+ for_each_possible_cpu(cpu) {
+ struct perf_cpu_context *cpuctx;
+
+ cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
+ __perf_event_init_context(&cpuctx->ctx);
+ cpuctx->ctx.pmu = pmu;
+ cpuctx->timer_interval = TICK_NSEC;
+ hrtimer_init(&cpuctx->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ cpuctx->timer.function = perf_event_context_tick;
+ }
- atomic_inc(&perf_swevent_enabled[event_id]);
- event->destroy = sw_perf_event_destroy;
+got_cpu_context:
+ if (!pmu->start_txn) {
+ if (pmu->pmu_enable) {
+ /*
+ * If we have pmu_enable/pmu_disable calls, install
+ * transaction stubs that use that to try and batch
+ * hardware accesses.
+ */
+ pmu->start_txn = perf_pmu_start_txn;
+ pmu->commit_txn = perf_pmu_commit_txn;
+ pmu->cancel_txn = perf_pmu_cancel_txn;
+ } else {
+ pmu->start_txn = perf_pmu_nop_void;
+ pmu->commit_txn = perf_pmu_nop_int;
+ pmu->cancel_txn = perf_pmu_nop_void;
+ }
+ }
+
+ if (!pmu->pmu_enable) {
+ pmu->pmu_enable = perf_pmu_nop_void;
+ pmu->pmu_disable = perf_pmu_nop_void;
+ }
+
+ list_add_rcu(&pmu->entry, &pmus);
+ ret = 0;
+unlock:
+ mutex_unlock(&pmus_lock);
+
+ return ret;
+
+free_pdc:
+ free_percpu(pmu->pmu_disable_count);
+ goto unlock;
+}
+
+void perf_pmu_unregister(struct pmu *pmu)
+{
+ mutex_lock(&pmus_lock);
+ list_del_rcu(&pmu->entry);
+ mutex_unlock(&pmus_lock);
+
+ /*
+ * We dereference the pmu list under both SRCU and regular RCU, so
+ * synchronize against both of those.
+ */
+ synchronize_srcu(&pmus_srcu);
+ synchronize_rcu();
+
+ free_percpu(pmu->pmu_disable_count);
+ free_pmu_context(pmu->pmu_cpu_context);
+}
+
+struct pmu *perf_init_event(struct perf_event *event)
+{
+ struct pmu *pmu = NULL;
+ int idx;
+
+ idx = srcu_read_lock(&pmus_srcu);
+ list_for_each_entry_rcu(pmu, &pmus, entry) {
+ int ret = pmu->event_init(event);
+ if (!ret)
+ goto unlock;
+
+ if (ret != -ENOENT) {
+ pmu = ERR_PTR(ret);
+ goto unlock;
}
- pmu = &perf_ops_generic;
- break;
}
+ pmu = ERR_PTR(-ENOENT);
+unlock:
+ srcu_read_unlock(&pmus_srcu, idx);
return pmu;
}
@@ -4828,20 +5257,17 @@ static const struct pmu *sw_perf_event_init(struct perf_event *event)
* Allocate and initialize a event structure
*/
static struct perf_event *
-perf_event_alloc(struct perf_event_attr *attr,
- int cpu,
- struct perf_event_context *ctx,
+perf_event_alloc(struct perf_event_attr *attr, int cpu,
struct perf_event *group_leader,
struct perf_event *parent_event,
- perf_overflow_handler_t overflow_handler,
- gfp_t gfpflags)
+ perf_overflow_handler_t overflow_handler)
{
- const struct pmu *pmu;
+ struct pmu *pmu;
struct perf_event *event;
struct hw_perf_event *hwc;
long err;
- event = kzalloc(sizeof(*event), gfpflags);
+ event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)
return ERR_PTR(-ENOMEM);
@@ -4866,7 +5292,6 @@ perf_event_alloc(struct perf_event_attr *attr,
event->attr = *attr;
event->group_leader = group_leader;
event->pmu = NULL;
- event->ctx = ctx;
event->oncpu = -1;
event->parent = parent_event;
@@ -4900,29 +5325,8 @@ perf_event_alloc(struct perf_event_attr *attr,
if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP))
goto done;
- switch (attr->type) {
- case PERF_TYPE_RAW:
- case PERF_TYPE_HARDWARE:
- case PERF_TYPE_HW_CACHE:
- pmu = hw_perf_event_init(event);
- break;
-
- case PERF_TYPE_SOFTWARE:
- pmu = sw_perf_event_init(event);
- break;
-
- case PERF_TYPE_TRACEPOINT:
- pmu = tp_perf_event_init(event);
- break;
-
- case PERF_TYPE_BREAKPOINT:
- pmu = bp_perf_event_init(event);
- break;
-
+ pmu = perf_init_event(event);
- default:
- break;
- }
done:
err = 0;
if (!pmu)
@@ -4947,6 +5351,13 @@ done:
atomic_inc(&nr_comm_events);
if (event->attr.task)
atomic_inc(&nr_task_events);
+ if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) {
+ err = get_callchain_buffers();
+ if (err) {
+ free_event(event);
+ return ERR_PTR(err);
+ }
+ }
}
return event;
@@ -5099,6 +5510,7 @@ SYSCALL_DEFINE5(perf_event_open,
struct perf_event_context *ctx;
struct file *event_file = NULL;
struct file *group_file = NULL;
+ struct pmu *pmu;
int event_fd;
int fput_needed = 0;
int err;
@@ -5125,12 +5537,9 @@ SYSCALL_DEFINE5(perf_event_open,
if (event_fd < 0)
return event_fd;
- /*
- * Get the target context (task or percpu):
- */
- ctx = find_get_context(pid, cpu);
- if (IS_ERR(ctx)) {
- err = PTR_ERR(ctx);
+ event = perf_event_alloc(&attr, cpu, group_leader, NULL, NULL);
+ if (IS_ERR(event)) {
+ err = PTR_ERR(event);
goto err_fd;
}
@@ -5138,7 +5547,7 @@ SYSCALL_DEFINE5(perf_event_open,
group_leader = perf_fget_light(group_fd, &fput_needed);
if (IS_ERR(group_leader)) {
err = PTR_ERR(group_leader);
- goto err_put_context;
+ goto err_alloc;
}
group_file = group_leader->filp;
if (flags & PERF_FLAG_FD_OUTPUT)
@@ -5148,6 +5557,23 @@ SYSCALL_DEFINE5(perf_event_open,
}
/*
+ * Special case software events and allow them to be part of
+ * any hardware group.
+ */
+ pmu = event->pmu;
+ if ((pmu->task_ctx_nr == perf_sw_context) && group_leader)
+ pmu = group_leader->pmu;
+
+ /*
+ * Get the target context (task or percpu):
+ */
+ ctx = find_get_context(pmu, pid, cpu);
+ if (IS_ERR(ctx)) {
+ err = PTR_ERR(ctx);
+ goto err_group_fd;
+ }
+
+ /*
* Look up the group leader (we will attach this event to it):
*/
if (group_leader) {
@@ -5158,37 +5584,30 @@ SYSCALL_DEFINE5(perf_event_open,
* becoming part of another group-sibling):
*/
if (group_leader->group_leader != group_leader)
- goto err_put_context;
+ goto err_context;
/*
* Do not allow to attach to a group in a different
* task or CPU context:
*/
if (group_leader->ctx != ctx)
- goto err_put_context;
+ goto err_context;
/*
* Only a group leader can be exclusive or pinned
*/
if (attr.exclusive || attr.pinned)
- goto err_put_context;
- }
-
- event = perf_event_alloc(&attr, cpu, ctx, group_leader,
- NULL, NULL, GFP_KERNEL);
- if (IS_ERR(event)) {
- err = PTR_ERR(event);
- goto err_put_context;
+ goto err_context;
}
if (output_event) {
err = perf_event_set_output(event, output_event);
if (err)
- goto err_free_put_context;
+ goto err_context;
}
event_file = anon_inode_getfile("[perf_event]", &perf_fops, event, O_RDWR);
if (IS_ERR(event_file)) {
err = PTR_ERR(event_file);
- goto err_free_put_context;
+ goto err_context;
}
event->filp = event_file;
@@ -5214,11 +5633,12 @@ SYSCALL_DEFINE5(perf_event_open,
fd_install(event_fd, event_file);
return event_fd;
-err_free_put_context:
- free_event(event);
-err_put_context:
- fput_light(group_file, fput_needed);
+err_context:
put_ctx(ctx);
+err_group_fd:
+ fput_light(group_file, fput_needed);
+err_alloc:
+ free_event(event);
err_fd:
put_unused_fd(event_fd);
return err;
@@ -5236,25 +5656,24 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
pid_t pid,
perf_overflow_handler_t overflow_handler)
{
- struct perf_event *event;
struct perf_event_context *ctx;
+ struct perf_event *event;
int err;
/*
* Get the target context (task or percpu):
*/
- ctx = find_get_context(pid, cpu);
- if (IS_ERR(ctx)) {
- err = PTR_ERR(ctx);
- goto err_exit;
- }
-
- event = perf_event_alloc(attr, cpu, ctx, NULL,
- NULL, overflow_handler, GFP_KERNEL);
+ event = perf_event_alloc(attr, cpu, NULL, NULL, overflow_handler);
if (IS_ERR(event)) {
err = PTR_ERR(event);
- goto err_put_context;
+ goto err;
+ }
+
+ ctx = find_get_context(event->pmu, pid, cpu);
+ if (IS_ERR(ctx)) {
+ err = PTR_ERR(ctx);
+ goto err_free;
}
event->filp = NULL;
@@ -5272,112 +5691,13 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
return event;
- err_put_context:
- put_ctx(ctx);
- err_exit:
+err_free:
+ free_event(event);
+err:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(perf_event_create_kernel_counter);
-/*
- * inherit a event from parent task to child task:
- */
-static struct perf_event *
-inherit_event(struct perf_event *parent_event,
- struct task_struct *parent,
- struct perf_event_context *parent_ctx,
- struct task_struct *child,
- struct perf_event *group_leader,
- struct perf_event_context *child_ctx)
-{
- struct perf_event *child_event;
-
- /*
- * Instead of creating recursive hierarchies of events,
- * we link inherited events back to the original parent,
- * which has a filp for sure, which we use as the reference
- * count:
- */
- if (parent_event->parent)
- parent_event = parent_event->parent;
-
- child_event = perf_event_alloc(&parent_event->attr,
- parent_event->cpu, child_ctx,
- group_leader, parent_event,
- NULL, GFP_KERNEL);
- if (IS_ERR(child_event))
- return child_event;
- get_ctx(child_ctx);
-
- /*
- * Make the child state follow the state of the parent event,
- * not its attr.disabled bit. We hold the parent's mutex,
- * so we won't race with perf_event_{en, dis}able_family.
- */
- if (parent_event->state >= PERF_EVENT_STATE_INACTIVE)
- child_event->state = PERF_EVENT_STATE_INACTIVE;
- else
- child_event->state = PERF_EVENT_STATE_OFF;
-
- if (parent_event->attr.freq) {
- u64 sample_period = parent_event->hw.sample_period;
- struct hw_perf_event *hwc = &child_event->hw;
-
- hwc->sample_period = sample_period;
- hwc->last_period = sample_period;
-
- local64_set(&hwc->period_left, sample_period);
- }
-
- child_event->overflow_handler = parent_event->overflow_handler;
-
- /*
- * Link it up in the child's context:
- */
- add_event_to_ctx(child_event, child_ctx);
-
- /*
- * Get a reference to the parent filp - we will fput it
- * when the child event exits. This is safe to do because
- * we are in the parent and we know that the filp still
- * exists and has a nonzero count:
- */
- atomic_long_inc(&parent_event->filp->f_count);
-
- /*
- * Link this into the parent event's child list
- */
- WARN_ON_ONCE(parent_event->ctx->parent_ctx);
- mutex_lock(&parent_event->child_mutex);
- list_add_tail(&child_event->child_list, &parent_event->child_list);
- mutex_unlock(&parent_event->child_mutex);
-
- return child_event;
-}
-
-static int inherit_group(struct perf_event *parent_event,
- struct task_struct *parent,
- struct perf_event_context *parent_ctx,
- struct task_struct *child,
- struct perf_event_context *child_ctx)
-{
- struct perf_event *leader;
- struct perf_event *sub;
- struct perf_event *child_ctr;
-
- leader = inherit_event(parent_event, parent, parent_ctx,
- child, NULL, child_ctx);
- if (IS_ERR(leader))
- return PTR_ERR(leader);
- list_for_each_entry(sub, &parent_event->sibling_list, group_entry) {
- child_ctr = inherit_event(sub, parent, parent_ctx,
- child, leader, child_ctx);
- if (IS_ERR(child_ctr))
- return PTR_ERR(child_ctr);
- }
- return 0;
-}
-
static void sync_child_event(struct perf_event *child_event,
struct task_struct *child)
{
@@ -5434,16 +5754,13 @@ __perf_event_exit_task(struct perf_event *child_event,
}
}
-/*
- * When a child task exits, feed back event values to parent events.
- */
-void perf_event_exit_task(struct task_struct *child)
+static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
{
struct perf_event *child_event, *tmp;
struct perf_event_context *child_ctx;
unsigned long flags;
- if (likely(!child->perf_event_ctxp)) {
+ if (likely(!child->perf_event_ctxp[ctxn])) {
perf_event_task(child, NULL, 0);
return;
}
@@ -5455,7 +5772,7 @@ void perf_event_exit_task(struct task_struct *child)
* scheduled, so we are now safe from rescheduling changing
* our context.
*/
- child_ctx = child->perf_event_ctxp;
+ child_ctx = child->perf_event_ctxp[ctxn];
__perf_event_task_sched_out(child_ctx);
/*
@@ -5464,7 +5781,7 @@ void perf_event_exit_task(struct task_struct *child)
* incremented the context's refcount before we do put_ctx below.
*/
raw_spin_lock(&child_ctx->lock);
- child->perf_event_ctxp = NULL;
+ child->perf_event_ctxp[ctxn] = NULL;
/*
* If this context is a clone; unclone it so it can't get
* swapped to another process while we're removing all
@@ -5517,6 +5834,17 @@ again:
put_ctx(child_ctx);
}
+/*
+ * When a child task exits, feed back event values to parent events.
+ */
+void perf_event_exit_task(struct task_struct *child)
+{
+ int ctxn;
+
+ for_each_task_context_nr(ctxn)
+ perf_event_exit_task_context(child, ctxn);
+}
+
static void perf_free_event(struct perf_event *event,
struct perf_event_context *ctx)
{
@@ -5538,48 +5866,165 @@ static void perf_free_event(struct perf_event *event,
/*
* free an unexposed, unused context as created by inheritance by
- * init_task below, used by fork() in case of fail.
+ * perf_event_init_task below, used by fork() in case of fail.
*/
void perf_event_free_task(struct task_struct *task)
{
- struct perf_event_context *ctx = task->perf_event_ctxp;
+ struct perf_event_context *ctx;
struct perf_event *event, *tmp;
+ int ctxn;
- if (!ctx)
- return;
+ for_each_task_context_nr(ctxn) {
+ ctx = task->perf_event_ctxp[ctxn];
+ if (!ctx)
+ continue;
- mutex_lock(&ctx->mutex);
+ mutex_lock(&ctx->mutex);
again:
- list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
- perf_free_event(event, ctx);
+ list_for_each_entry_safe(event, tmp, &ctx->pinned_groups,
+ group_entry)
+ perf_free_event(event, ctx);
- list_for_each_entry_safe(event, tmp, &ctx->flexible_groups,
- group_entry)
- perf_free_event(event, ctx);
+ list_for_each_entry_safe(event, tmp, &ctx->flexible_groups,
+ group_entry)
+ perf_free_event(event, ctx);
- if (!list_empty(&ctx->pinned_groups) ||
- !list_empty(&ctx->flexible_groups))
- goto again;
+ if (!list_empty(&ctx->pinned_groups) ||
+ !list_empty(&ctx->flexible_groups))
+ goto again;
- mutex_unlock(&ctx->mutex);
+ mutex_unlock(&ctx->mutex);
- put_ctx(ctx);
+ put_ctx(ctx);
+ }
+}
+
+void perf_event_delayed_put(struct task_struct *task)
+{
+ int ctxn;
+
+ for_each_task_context_nr(ctxn)
+ WARN_ON_ONCE(task->perf_event_ctxp[ctxn]);
+}
+
+/*
+ * inherit a event from parent task to child task:
+ */
+static struct perf_event *
+inherit_event(struct perf_event *parent_event,
+ struct task_struct *parent,
+ struct perf_event_context *parent_ctx,
+ struct task_struct *child,
+ struct perf_event *group_leader,
+ struct perf_event_context *child_ctx)
+{
+ struct perf_event *child_event;
+ unsigned long flags;
+
+ /*
+ * Instead of creating recursive hierarchies of events,
+ * we link inherited events back to the original parent,
+ * which has a filp for sure, which we use as the reference
+ * count:
+ */
+ if (parent_event->parent)
+ parent_event = parent_event->parent;
+
+ child_event = perf_event_alloc(&parent_event->attr,
+ parent_event->cpu,
+ group_leader, parent_event,
+ NULL);
+ if (IS_ERR(child_event))
+ return child_event;
+ get_ctx(child_ctx);
+
+ /*
+ * Make the child state follow the state of the parent event,
+ * not its attr.disabled bit. We hold the parent's mutex,
+ * so we won't race with perf_event_{en, dis}able_family.
+ */
+ if (parent_event->state >= PERF_EVENT_STATE_INACTIVE)
+ child_event->state = PERF_EVENT_STATE_INACTIVE;
+ else
+ child_event->state = PERF_EVENT_STATE_OFF;
+
+ if (parent_event->attr.freq) {
+ u64 sample_period = parent_event->hw.sample_period;
+ struct hw_perf_event *hwc = &child_event->hw;
+
+ hwc->sample_period = sample_period;
+ hwc->last_period = sample_period;
+
+ local64_set(&hwc->period_left, sample_period);
+ }
+
+ child_event->ctx = child_ctx;
+ child_event->overflow_handler = parent_event->overflow_handler;
+
+ /*
+ * Link it up in the child's context:
+ */
+ raw_spin_lock_irqsave(&child_ctx->lock, flags);
+ add_event_to_ctx(child_event, child_ctx);
+ raw_spin_unlock_irqrestore(&child_ctx->lock, flags);
+
+ /*
+ * Get a reference to the parent filp - we will fput it
+ * when the child event exits. This is safe to do because
+ * we are in the parent and we know that the filp still
+ * exists and has a nonzero count:
+ */
+ atomic_long_inc(&parent_event->filp->f_count);
+
+ /*
+ * Link this into the parent event's child list
+ */
+ WARN_ON_ONCE(parent_event->ctx->parent_ctx);
+ mutex_lock(&parent_event->child_mutex);
+ list_add_tail(&child_event->child_list, &parent_event->child_list);
+ mutex_unlock(&parent_event->child_mutex);
+
+ return child_event;
+}
+
+static int inherit_group(struct perf_event *parent_event,
+ struct task_struct *parent,
+ struct perf_event_context *parent_ctx,
+ struct task_struct *child,
+ struct perf_event_context *child_ctx)
+{
+ struct perf_event *leader;
+ struct perf_event *sub;
+ struct perf_event *child_ctr;
+
+ leader = inherit_event(parent_event, parent, parent_ctx,
+ child, NULL, child_ctx);
+ if (IS_ERR(leader))
+ return PTR_ERR(leader);
+ list_for_each_entry(sub, &parent_event->sibling_list, group_entry) {
+ child_ctr = inherit_event(sub, parent, parent_ctx,
+ child, leader, child_ctx);
+ if (IS_ERR(child_ctr))
+ return PTR_ERR(child_ctr);
+ }
+ return 0;
}
static int
inherit_task_group(struct perf_event *event, struct task_struct *parent,
struct perf_event_context *parent_ctx,
- struct task_struct *child,
+ struct task_struct *child, int ctxn,
int *inherited_all)
{
int ret;
- struct perf_event_context *child_ctx = child->perf_event_ctxp;
+ struct perf_event_context *child_ctx;
if (!event->attr.inherit) {
*inherited_all = 0;
return 0;
}
+ child_ctx = child->perf_event_ctxp[ctxn];
if (!child_ctx) {
/*
* This is executed from the parent task context, so
@@ -5588,14 +6033,11 @@ inherit_task_group(struct perf_event *event, struct task_struct *parent,
* child.
*/
- child_ctx = kzalloc(sizeof(struct perf_event_context),
- GFP_KERNEL);
+ child_ctx = alloc_perf_context(event->pmu, child);
if (!child_ctx)
return -ENOMEM;
- __perf_event_init_context(child_ctx, child);
- child->perf_event_ctxp = child_ctx;
- get_task_struct(child);
+ child->perf_event_ctxp[ctxn] = child_ctx;
}
ret = inherit_group(event, parent, parent_ctx,
@@ -5607,11 +6049,10 @@ inherit_task_group(struct perf_event *event, struct task_struct *parent,
return ret;
}
-
/*
* Initialize the perf_event context in task_struct
*/
-int perf_event_init_task(struct task_struct *child)
+int perf_event_init_context(struct task_struct *child, int ctxn)
{
struct perf_event_context *child_ctx, *parent_ctx;
struct perf_event_context *cloned_ctx;
@@ -5620,19 +6061,19 @@ int perf_event_init_task(struct task_struct *child)
int inherited_all = 1;
int ret = 0;
- child->perf_event_ctxp = NULL;
+ child->perf_event_ctxp[ctxn] = NULL;
mutex_init(&child->perf_event_mutex);
INIT_LIST_HEAD(&child->perf_event_list);
- if (likely(!parent->perf_event_ctxp))
+ if (likely(!parent->perf_event_ctxp[ctxn]))
return 0;
/*
* If the parent's context is a clone, pin it so it won't get
* swapped under us.
*/
- parent_ctx = perf_pin_task_context(parent);
+ parent_ctx = perf_pin_task_context(parent, ctxn);
/*
* No need to check if parent_ctx != NULL here; since we saw
@@ -5652,20 +6093,20 @@ int perf_event_init_task(struct task_struct *child)
* the list, not manipulating it:
*/
list_for_each_entry(event, &parent_ctx->pinned_groups, group_entry) {
- ret = inherit_task_group(event, parent, parent_ctx, child,
- &inherited_all);
+ ret = inherit_task_group(event, parent, parent_ctx,
+ child, ctxn, &inherited_all);
if (ret)
break;
}
list_for_each_entry(event, &parent_ctx->flexible_groups, group_entry) {
- ret = inherit_task_group(event, parent, parent_ctx, child,
- &inherited_all);
+ ret = inherit_task_group(event, parent, parent_ctx,
+ child, ctxn, &inherited_all);
if (ret)
break;
}
- child_ctx = child->perf_event_ctxp;
+ child_ctx = child->perf_event_ctxp[ctxn];
if (child_ctx && inherited_all) {
/*
@@ -5694,63 +6135,89 @@ int perf_event_init_task(struct task_struct *child)
return ret;
}
+/*
+ * Initialize the perf_event context in task_struct
+ */
+int perf_event_init_task(struct task_struct *child)
+{
+ int ctxn, ret;
+
+ for_each_task_context_nr(ctxn) {
+ ret = perf_event_init_context(child, ctxn);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
static void __init perf_event_init_all_cpus(void)
{
+ struct swevent_htable *swhash;
int cpu;
- struct perf_cpu_context *cpuctx;
for_each_possible_cpu(cpu) {
- cpuctx = &per_cpu(perf_cpu_context, cpu);
- mutex_init(&cpuctx->hlist_mutex);
- __perf_event_init_context(&cpuctx->ctx, NULL);
+ swhash = &per_cpu(swevent_htable, cpu);
+ mutex_init(&swhash->hlist_mutex);
}
}
static void __cpuinit perf_event_init_cpu(int cpu)
{
- struct perf_cpu_context *cpuctx;
-
- cpuctx = &per_cpu(perf_cpu_context, cpu);
-
- spin_lock(&perf_resource_lock);
- cpuctx->max_pertask = perf_max_events - perf_reserved_percpu;
- spin_unlock(&perf_resource_lock);
+ struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu);
- mutex_lock(&cpuctx->hlist_mutex);
- if (cpuctx->hlist_refcount > 0) {
+ mutex_lock(&swhash->hlist_mutex);
+ if (swhash->hlist_refcount > 0) {
struct swevent_hlist *hlist;
- hlist = kzalloc(sizeof(*hlist), GFP_KERNEL);
- WARN_ON_ONCE(!hlist);
- rcu_assign_pointer(cpuctx->swevent_hlist, hlist);
+ hlist = kzalloc_node(sizeof(*hlist), GFP_KERNEL, cpu_to_node(cpu));
+ WARN_ON(!hlist);
+ rcu_assign_pointer(swhash->swevent_hlist, hlist);
}
- mutex_unlock(&cpuctx->hlist_mutex);
+ mutex_unlock(&swhash->hlist_mutex);
}
#ifdef CONFIG_HOTPLUG_CPU
-static void __perf_event_exit_cpu(void *info)
+static void __perf_event_exit_context(void *__info)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- struct perf_event_context *ctx = &cpuctx->ctx;
+ struct perf_event_context *ctx = __info;
struct perf_event *event, *tmp;
+ perf_pmu_rotate_stop(ctx->pmu);
+
list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
__perf_event_remove_from_context(event);
list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, group_entry)
__perf_event_remove_from_context(event);
}
+
+static void perf_event_exit_cpu_context(int cpu)
+{
+ struct perf_event_context *ctx;
+ struct pmu *pmu;
+ int idx;
+
+ idx = srcu_read_lock(&pmus_srcu);
+ list_for_each_entry_rcu(pmu, &pmus, entry) {
+ ctx = &this_cpu_ptr(pmu->pmu_cpu_context)->ctx;
+
+ mutex_lock(&ctx->mutex);
+ smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1);
+ mutex_unlock(&ctx->mutex);
+ }
+ srcu_read_unlock(&pmus_srcu, idx);
+
+}
+
static void perf_event_exit_cpu(int cpu)
{
- struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
- struct perf_event_context *ctx = &cpuctx->ctx;
+ struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu);
- mutex_lock(&cpuctx->hlist_mutex);
- swevent_hlist_release(cpuctx);
- mutex_unlock(&cpuctx->hlist_mutex);
+ mutex_lock(&swhash->hlist_mutex);
+ swevent_hlist_release(swhash);
+ mutex_unlock(&swhash->hlist_mutex);
- mutex_lock(&ctx->mutex);
- smp_call_function_single(cpu, __perf_event_exit_cpu, NULL, 1);
- mutex_unlock(&ctx->mutex);
+ perf_event_exit_cpu_context(cpu);
}
#else
static inline void perf_event_exit_cpu(int cpu) { }
@@ -5780,118 +6247,13 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
return NOTIFY_OK;
}
-/*
- * This has to have a higher priority than migration_notifier in sched.c.
- */
-static struct notifier_block __cpuinitdata perf_cpu_nb = {
- .notifier_call = perf_cpu_notify,
- .priority = 20,
-};
-
void __init perf_event_init(void)
{
perf_event_init_all_cpus();
- perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
- (void *)(long)smp_processor_id());
- perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_ONLINE,
- (void *)(long)smp_processor_id());
- register_cpu_notifier(&perf_cpu_nb);
-}
-
-static ssize_t perf_show_reserve_percpu(struct sysdev_class *class,
- struct sysdev_class_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%d\n", perf_reserved_percpu);
-}
-
-static ssize_t
-perf_set_reserve_percpu(struct sysdev_class *class,
- struct sysdev_class_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct perf_cpu_context *cpuctx;
- unsigned long val;
- int err, cpu, mpt;
-
- err = strict_strtoul(buf, 10, &val);
- if (err)
- return err;
- if (val > perf_max_events)
- return -EINVAL;
-
- spin_lock(&perf_resource_lock);
- perf_reserved_percpu = val;
- for_each_online_cpu(cpu) {
- cpuctx = &per_cpu(perf_cpu_context, cpu);
- raw_spin_lock_irq(&cpuctx->ctx.lock);
- mpt = min(perf_max_events - cpuctx->ctx.nr_events,
- perf_max_events - perf_reserved_percpu);
- cpuctx->max_pertask = mpt;
- raw_spin_unlock_irq(&cpuctx->ctx.lock);
- }
- spin_unlock(&perf_resource_lock);
-
- return count;
-}
-
-static ssize_t perf_show_overcommit(struct sysdev_class *class,
- struct sysdev_class_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%d\n", perf_overcommit);
-}
-
-static ssize_t
-perf_set_overcommit(struct sysdev_class *class,
- struct sysdev_class_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long val;
- int err;
-
- err = strict_strtoul(buf, 10, &val);
- if (err)
- return err;
- if (val > 1)
- return -EINVAL;
-
- spin_lock(&perf_resource_lock);
- perf_overcommit = val;
- spin_unlock(&perf_resource_lock);
-
- return count;
-}
-
-static SYSDEV_CLASS_ATTR(
- reserve_percpu,
- 0644,
- perf_show_reserve_percpu,
- perf_set_reserve_percpu
- );
-
-static SYSDEV_CLASS_ATTR(
- overcommit,
- 0644,
- perf_show_overcommit,
- perf_set_overcommit
- );
-
-static struct attribute *perfclass_attrs[] = {
- &attr_reserve_percpu.attr,
- &attr_overcommit.attr,
- NULL
-};
-
-static struct attribute_group perfclass_attr_group = {
- .attrs = perfclass_attrs,
- .name = "perf_events",
-};
-
-static int __init perf_event_sysfs_init(void)
-{
- return sysfs_create_group(&cpu_sysdev_class.kset.kobj,
- &perfclass_attr_group);
+ init_srcu_struct(&pmus_srcu);
+ perf_pmu_register(&perf_swevent);
+ perf_pmu_register(&perf_cpu_clock);
+ perf_pmu_register(&perf_task_clock);
+ perf_tp_register();
+ perf_cpu_notifier(perf_cpu_notify);
}
-device_initcall(perf_event_sysfs_init);
diff --git a/kernel/sched.c b/kernel/sched.c
index ed09d4f2a69c..1c3ea7a55b7b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3584,8 +3584,6 @@ void scheduler_tick(void)
curr->sched_class->task_tick(rq, curr, 0);
raw_spin_unlock(&rq->lock);
- perf_event_task_tick(curr);
-
#ifdef CONFIG_SMP
rq->idle_at_tick = idle_cpu(cpu);
trigger_load_balance(rq, cpu);
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1884cf5bc110..65fb077ea79c 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -884,10 +884,8 @@ enum {
FTRACE_ENABLE_CALLS = (1 << 0),
FTRACE_DISABLE_CALLS = (1 << 1),
FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
- FTRACE_ENABLE_MCOUNT = (1 << 3),
- FTRACE_DISABLE_MCOUNT = (1 << 4),
- FTRACE_START_FUNC_RET = (1 << 5),
- FTRACE_STOP_FUNC_RET = (1 << 6),
+ FTRACE_START_FUNC_RET = (1 << 3),
+ FTRACE_STOP_FUNC_RET = (1 << 4),
};
static int ftrace_filtered;
@@ -1226,8 +1224,6 @@ static void ftrace_shutdown(int command)
static void ftrace_startup_sysctl(void)
{
- int command = FTRACE_ENABLE_MCOUNT;
-
if (unlikely(ftrace_disabled))
return;
@@ -1235,23 +1231,17 @@ static void ftrace_startup_sysctl(void)
saved_ftrace_func = NULL;
/* ftrace_start_up is true if we want ftrace running */
if (ftrace_start_up)
- command |= FTRACE_ENABLE_CALLS;
-
- ftrace_run_update_code(command);
+ ftrace_run_update_code(FTRACE_ENABLE_CALLS);
}
static void ftrace_shutdown_sysctl(void)
{
- int command = FTRACE_DISABLE_MCOUNT;
-
if (unlikely(ftrace_disabled))
return;
/* ftrace_start_up is true if ftrace is running */
if (ftrace_start_up)
- command |= FTRACE_DISABLE_CALLS;
-
- ftrace_run_update_code(command);
+ ftrace_run_update_code(FTRACE_DISABLE_CALLS);
}
static cycle_t ftrace_update_time;
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 492197e2f86c..4e2f03410377 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2606,6 +2606,19 @@ void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
}
EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
+/*
+ * The total entries in the ring buffer is the running counter
+ * of entries entered into the ring buffer, minus the sum of
+ * the entries read from the ring buffer and the number of
+ * entries that were overwritten.
+ */
+static inline unsigned long
+rb_num_of_entries(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ return local_read(&cpu_buffer->entries) -
+ (local_read(&cpu_buffer->overrun) + cpu_buffer->read);
+}
+
/**
* ring_buffer_entries_cpu - get the number of entries in a cpu buffer
* @buffer: The ring buffer
@@ -2614,16 +2627,13 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
{
struct ring_buffer_per_cpu *cpu_buffer;
- unsigned long ret;
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 0;
cpu_buffer = buffer->buffers[cpu];
- ret = (local_read(&cpu_buffer->entries) - local_read(&cpu_buffer->overrun))
- - cpu_buffer->read;
- return ret;
+ return rb_num_of_entries(cpu_buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
@@ -2684,8 +2694,7 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)
/* if you care about this being correct, lock the buffer */
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
- entries += (local_read(&cpu_buffer->entries) -
- local_read(&cpu_buffer->overrun)) - cpu_buffer->read;
+ entries += rb_num_of_entries(cpu_buffer);
}
return entries;
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 31cc4cb0dbf2..39c059ca670e 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -9,7 +9,7 @@
#include <linux/kprobes.h>
#include "trace.h"
-static char *perf_trace_buf[4];
+static char __percpu *perf_trace_buf[PERF_NR_CONTEXTS];
/*
* Force it to be aligned to unsigned long to avoid misaligned accesses
@@ -24,7 +24,7 @@ static int total_ref_count;
static int perf_trace_event_init(struct ftrace_event_call *tp_event,
struct perf_event *p_event)
{
- struct hlist_head *list;
+ struct hlist_head __percpu *list;
int ret = -ENOMEM;
int cpu;
@@ -42,11 +42,11 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
tp_event->perf_events = list;
if (!total_ref_count) {
- char *buf;
+ char __percpu *buf;
int i;
- for (i = 0; i < 4; i++) {
- buf = (char *)alloc_percpu(perf_trace_t);
+ for (i = 0; i < PERF_NR_CONTEXTS; i++) {
+ buf = (char __percpu *)alloc_percpu(perf_trace_t);
if (!buf)
goto fail;
@@ -65,7 +65,7 @@ fail:
if (!total_ref_count) {
int i;
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < PERF_NR_CONTEXTS; i++) {
free_percpu(perf_trace_buf[i]);
perf_trace_buf[i] = NULL;
}
@@ -101,22 +101,26 @@ int perf_trace_init(struct perf_event *p_event)
return ret;
}
-int perf_trace_enable(struct perf_event *p_event)
+int perf_trace_add(struct perf_event *p_event, int flags)
{
struct ftrace_event_call *tp_event = p_event->tp_event;
+ struct hlist_head __percpu *pcpu_list;
struct hlist_head *list;
- list = tp_event->perf_events;
- if (WARN_ON_ONCE(!list))
+ pcpu_list = tp_event->perf_events;
+ if (WARN_ON_ONCE(!pcpu_list))
return -EINVAL;
- list = this_cpu_ptr(list);
+ if (!(flags & PERF_EF_START))
+ p_event->hw.state = PERF_HES_STOPPED;
+
+ list = this_cpu_ptr(pcpu_list);
hlist_add_head_rcu(&p_event->hlist_entry, list);
return 0;
}
-void perf_trace_disable(struct perf_event *p_event)
+void perf_trace_del(struct perf_event *p_event, int flags)
{
hlist_del_rcu(&p_event->hlist_entry);
}
@@ -142,7 +146,7 @@ void perf_trace_destroy(struct perf_event *p_event)
tp_event->perf_events = NULL;
if (!--total_ref_count) {
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < PERF_NR_CONTEXTS; i++) {
free_percpu(perf_trace_buf[i]);
perf_trace_buf[i] = NULL;
}
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 4c758f146328..398c0e8b332c 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -600,21 +600,29 @@ out:
enum {
FORMAT_HEADER = 1,
- FORMAT_PRINTFMT = 2,
+ FORMAT_FIELD_SEPERATOR = 2,
+ FORMAT_PRINTFMT = 3,
};
static void *f_next(struct seq_file *m, void *v, loff_t *pos)
{
struct ftrace_event_call *call = m->private;
struct ftrace_event_field *field;
- struct list_head *head;
+ struct list_head *common_head = &ftrace_common_fields;
+ struct list_head *head = trace_get_fields(call);
(*pos)++;
switch ((unsigned long)v) {
case FORMAT_HEADER:
- head = &ftrace_common_fields;
+ if (unlikely(list_empty(common_head)))
+ return NULL;
+
+ field = list_entry(common_head->prev,
+ struct ftrace_event_field, link);
+ return field;
+ case FORMAT_FIELD_SEPERATOR:
if (unlikely(list_empty(head)))
return NULL;
@@ -626,31 +634,10 @@ static void *f_next(struct seq_file *m, void *v, loff_t *pos)
return NULL;
}
- head = trace_get_fields(call);
-
- /*
- * To separate common fields from event fields, the
- * LSB is set on the first event field. Clear it in case.
- */
- v = (void *)((unsigned long)v & ~1L);
-
field = v;
- /*
- * If this is a common field, and at the end of the list, then
- * continue with main list.
- */
- if (field->link.prev == &ftrace_common_fields) {
- if (unlikely(list_empty(head)))
- return NULL;
- field = list_entry(head->prev, struct ftrace_event_field, link);
- /* Set the LSB to notify f_show to print an extra newline */
- field = (struct ftrace_event_field *)
- ((unsigned long)field | 1);
- return field;
- }
-
- /* If we are done tell f_show to print the format */
- if (field->link.prev == head)
+ if (field->link.prev == common_head)
+ return (void *)FORMAT_FIELD_SEPERATOR;
+ else if (field->link.prev == head)
return (void *)FORMAT_PRINTFMT;
field = list_entry(field->link.prev, struct ftrace_event_field, link);
@@ -688,22 +675,16 @@ static int f_show(struct seq_file *m, void *v)
seq_printf(m, "format:\n");
return 0;
+ case FORMAT_FIELD_SEPERATOR:
+ seq_putc(m, '\n');
+ return 0;
+
case FORMAT_PRINTFMT:
seq_printf(m, "\nprint fmt: %s\n",
call->print_fmt);
return 0;
}
- /*
- * To separate common fields from event fields, the
- * LSB is set on the first event field. Clear it and
- * print a newline if it is set.
- */
- if ((unsigned long)v & 1) {
- seq_putc(m, '\n');
- v = (void *)((unsigned long)v & ~1L);
- }
-
field = v;
/*
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 6f233698518e..02c708ae0d42 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -15,15 +15,19 @@
#include "trace.h"
#include "trace_output.h"
+/* When set, irq functions will be ignored */
+static int ftrace_graph_skip_irqs;
+
struct fgraph_cpu_data {
pid_t last_pid;
int depth;
+ int depth_irq;
int ignore;
unsigned long enter_funcs[FTRACE_RETFUNC_DEPTH];
};
struct fgraph_data {
- struct fgraph_cpu_data *cpu_data;
+ struct fgraph_cpu_data __percpu *cpu_data;
/* Place to preserve last processed entry. */
struct ftrace_graph_ent_entry ent;
@@ -41,6 +45,7 @@ struct fgraph_data {
#define TRACE_GRAPH_PRINT_PROC 0x8
#define TRACE_GRAPH_PRINT_DURATION 0x10
#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
+#define TRACE_GRAPH_PRINT_IRQS 0x40
static struct tracer_opt trace_opts[] = {
/* Display overruns? (for self-debug purpose) */
@@ -55,13 +60,15 @@ static struct tracer_opt trace_opts[] = {
{ TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
/* Display absolute time of an entry */
{ TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
+ /* Display interrupts */
+ { TRACER_OPT(funcgraph-irqs, TRACE_GRAPH_PRINT_IRQS) },
{ } /* Empty entry */
};
static struct tracer_flags tracer_flags = {
/* Don't display overruns and proc by default */
.val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
- TRACE_GRAPH_PRINT_DURATION,
+ TRACE_GRAPH_PRINT_DURATION | TRACE_GRAPH_PRINT_IRQS,
.opts = trace_opts
};
@@ -204,6 +211,14 @@ int __trace_graph_entry(struct trace_array *tr,
return 1;
}
+static inline int ftrace_graph_ignore_irqs(void)
+{
+ if (!ftrace_graph_skip_irqs)
+ return 0;
+
+ return in_irq();
+}
+
int trace_graph_entry(struct ftrace_graph_ent *trace)
{
struct trace_array *tr = graph_array;
@@ -218,7 +233,8 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
return 0;
/* trace it when it is-nested-in or is a function enabled. */
- if (!(trace->depth || ftrace_graph_addr(trace->func)))
+ if (!(trace->depth || ftrace_graph_addr(trace->func)) ||
+ ftrace_graph_ignore_irqs())
return 0;
local_irq_save(flags);
@@ -855,6 +871,92 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
return 0;
}
+/*
+ * Entry check for irq code
+ *
+ * returns 1 if
+ * - we are inside irq code
+ * - we just extered irq code
+ *
+ * retunns 0 if
+ * - funcgraph-interrupts option is set
+ * - we are not inside irq code
+ */
+static int
+check_irq_entry(struct trace_iterator *iter, u32 flags,
+ unsigned long addr, int depth)
+{
+ int cpu = iter->cpu;
+ struct fgraph_data *data = iter->private;
+ int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
+
+ if (flags & TRACE_GRAPH_PRINT_IRQS)
+ return 0;
+
+ /*
+ * We are inside the irq code
+ */
+ if (*depth_irq >= 0)
+ return 1;
+
+ if ((addr < (unsigned long)__irqentry_text_start) ||
+ (addr >= (unsigned long)__irqentry_text_end))
+ return 0;
+
+ /*
+ * We are entering irq code.
+ */
+ *depth_irq = depth;
+ return 1;
+}
+
+/*
+ * Return check for irq code
+ *
+ * returns 1 if
+ * - we are inside irq code
+ * - we just left irq code
+ *
+ * returns 0 if
+ * - funcgraph-interrupts option is set
+ * - we are not inside irq code
+ */
+static int
+check_irq_return(struct trace_iterator *iter, u32 flags, int depth)
+{
+ int cpu = iter->cpu;
+ struct fgraph_data *data = iter->private;
+ int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
+
+ if (flags & TRACE_GRAPH_PRINT_IRQS)
+ return 0;
+
+ /*
+ * We are not inside the irq code.
+ */
+ if (*depth_irq == -1)
+ return 0;
+
+ /*
+ * We are inside the irq code, and this is returning entry.
+ * Let's not trace it and clear the entry depth, since
+ * we are out of irq code.
+ *
+ * This condition ensures that we 'leave the irq code' once
+ * we are out of the entry depth. Thus protecting us from
+ * the RETURN entry loss.
+ */
+ if (*depth_irq >= depth) {
+ *depth_irq = -1;
+ return 1;
+ }
+
+ /*
+ * We are inside the irq code, and this is not the entry.
+ */
+ return 1;
+}
+
static enum print_line_t
print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
struct trace_iterator *iter, u32 flags)
@@ -865,6 +967,9 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
static enum print_line_t ret;
int cpu = iter->cpu;
+ if (check_irq_entry(iter, flags, call->func, call->depth))
+ return TRACE_TYPE_HANDLED;
+
if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func, flags))
return TRACE_TYPE_PARTIAL_LINE;
@@ -902,6 +1007,9 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
int ret;
int i;
+ if (check_irq_return(iter, flags, trace->depth))
+ return TRACE_TYPE_HANDLED;
+
if (data) {
struct fgraph_cpu_data *cpu_data;
int cpu = iter->cpu;
@@ -1210,9 +1318,12 @@ void graph_trace_open(struct trace_iterator *iter)
pid_t *pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid);
int *depth = &(per_cpu_ptr(data->cpu_data, cpu)->depth);
int *ignore = &(per_cpu_ptr(data->cpu_data, cpu)->ignore);
+ int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
+
*pid = -1;
*depth = 0;
*ignore = 0;
+ *depth_irq = -1;
}
iter->private = data;
@@ -1235,6 +1346,14 @@ void graph_trace_close(struct trace_iterator *iter)
}
}
+static int func_graph_set_flag(u32 old_flags, u32 bit, int set)
+{
+ if (bit == TRACE_GRAPH_PRINT_IRQS)
+ ftrace_graph_skip_irqs = !set;
+
+ return 0;
+}
+
static struct trace_event_functions graph_functions = {
.trace = print_graph_function_event,
};
@@ -1261,6 +1380,7 @@ static struct tracer graph_trace __read_mostly = {
.print_line = print_graph_function,
.print_header = print_graph_headers,
.flags = &tracer_flags,
+ .set_flag = func_graph_set_flag,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_function_graph,
#endif
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 7f9c3c52ecc1..fa71aebda4ff 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -43,7 +43,6 @@ static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
#endif
-static int __read_mostly did_panic;
static int __initdata no_watchdog;
@@ -187,18 +186,6 @@ static int is_softlockup(unsigned long touch_ts)
return 0;
}
-static int
-watchdog_panic(struct notifier_block *this, unsigned long event, void *ptr)
-{
- did_panic = 1;
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block panic_block = {
- .notifier_call = watchdog_panic,
-};
-
#ifdef CONFIG_HARDLOCKUP_DETECTOR
static struct perf_event_attr wd_hw_attr = {
.type = PERF_TYPE_HARDWARE,
@@ -378,7 +365,7 @@ static int watchdog_nmi_enable(int cpu)
}
printk(KERN_ERR "NMI watchdog failed to create perf event on cpu%i: %p\n", cpu, event);
- return -1;
+ return PTR_ERR(event);
/* success path */
out_save:
@@ -422,17 +409,19 @@ static int watchdog_prepare_cpu(int cpu)
static int watchdog_enable(int cpu)
{
struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+ int err;
/* enable the perf event */
- if (watchdog_nmi_enable(cpu) != 0)
- return -1;
+ err = watchdog_nmi_enable(cpu);
+ if (err)
+ return err;
/* create the watchdog thread */
if (!p) {
p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
if (IS_ERR(p)) {
printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
- return -1;
+ return PTR_ERR(p);
}
kthread_bind(p, cpu);
per_cpu(watchdog_touch_ts, cpu) = 0;
@@ -526,17 +515,16 @@ static int __cpuinit
cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
int hotcpu = (unsigned long)hcpu;
+ int err = 0;
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
- if (watchdog_prepare_cpu(hotcpu))
- return NOTIFY_BAD;
+ err = watchdog_prepare_cpu(hotcpu);
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
- if (watchdog_enable(hotcpu))
- return NOTIFY_BAD;
+ err = watchdog_enable(hotcpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_UP_CANCELED:
@@ -549,7 +537,7 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
break;
#endif /* CONFIG_HOTPLUG_CPU */
}
- return NOTIFY_OK;
+ return notifier_from_errno(err);
}
static struct notifier_block __cpuinitdata cpu_nfb = {
@@ -565,13 +553,11 @@ static int __init spawn_watchdog_task(void)
return 0;
err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
- WARN_ON(err == NOTIFY_BAD);
+ WARN_ON(notifier_to_errno(err));
cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
register_cpu_notifier(&cpu_nfb);
- atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
-
return 0;
}
early_initcall(spawn_watchdog_task);