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-rw-r--r--kernel/trace/trace.c453
1 files changed, 295 insertions, 158 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ed7b5d1e12f4..48ef4960ec90 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -87,18 +87,6 @@ static int tracing_disabled = 1;
DEFINE_PER_CPU(int, ftrace_cpu_disabled);
-static inline void ftrace_disable_cpu(void)
-{
- preempt_disable();
- __this_cpu_inc(ftrace_cpu_disabled);
-}
-
-static inline void ftrace_enable_cpu(void)
-{
- __this_cpu_dec(ftrace_cpu_disabled);
- preempt_enable();
-}
-
cpumask_var_t __read_mostly tracing_buffer_mask;
/*
@@ -629,7 +617,6 @@ ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
{
int len;
- void *ret;
if (s->len <= s->readpos)
return -EBUSY;
@@ -637,9 +624,7 @@ static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
len = s->len - s->readpos;
if (cnt > len)
cnt = len;
- ret = memcpy(buf, s->buffer + s->readpos, cnt);
- if (!ret)
- return -EFAULT;
+ memcpy(buf, s->buffer + s->readpos, cnt);
s->readpos += cnt;
return cnt;
@@ -751,8 +736,6 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
arch_spin_lock(&ftrace_max_lock);
- ftrace_disable_cpu();
-
ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu);
if (ret == -EBUSY) {
@@ -766,8 +749,6 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
"Failed to swap buffers due to commit in progress\n");
}
- ftrace_enable_cpu();
-
WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY);
__update_max_tr(tr, tsk, cpu);
@@ -841,7 +822,8 @@ __acquires(kernel_lock)
/* If we expanded the buffers, make sure the max is expanded too */
if (ring_buffer_expanded && type->use_max_tr)
- ring_buffer_resize(max_tr.buffer, trace_buf_size);
+ ring_buffer_resize(max_tr.buffer, trace_buf_size,
+ RING_BUFFER_ALL_CPUS);
/* the test is responsible for initializing and enabling */
pr_info("Testing tracer %s: ", type->name);
@@ -857,7 +839,8 @@ __acquires(kernel_lock)
/* Shrink the max buffer again */
if (ring_buffer_expanded && type->use_max_tr)
- ring_buffer_resize(max_tr.buffer, 1);
+ ring_buffer_resize(max_tr.buffer, 1,
+ RING_BUFFER_ALL_CPUS);
printk(KERN_CONT "PASSED\n");
}
@@ -917,13 +900,6 @@ out:
mutex_unlock(&trace_types_lock);
}
-static void __tracing_reset(struct ring_buffer *buffer, int cpu)
-{
- ftrace_disable_cpu();
- ring_buffer_reset_cpu(buffer, cpu);
- ftrace_enable_cpu();
-}
-
void tracing_reset(struct trace_array *tr, int cpu)
{
struct ring_buffer *buffer = tr->buffer;
@@ -932,7 +908,7 @@ void tracing_reset(struct trace_array *tr, int cpu)
/* Make sure all commits have finished */
synchronize_sched();
- __tracing_reset(buffer, cpu);
+ ring_buffer_reset_cpu(buffer, cpu);
ring_buffer_record_enable(buffer);
}
@@ -950,7 +926,7 @@ void tracing_reset_online_cpus(struct trace_array *tr)
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
- __tracing_reset(buffer, cpu);
+ ring_buffer_reset_cpu(buffer, cpu);
ring_buffer_record_enable(buffer);
}
@@ -1498,25 +1474,119 @@ static void __trace_userstack(struct trace_array *tr, unsigned long flags)
#endif /* CONFIG_STACKTRACE */
+/* created for use with alloc_percpu */
+struct trace_buffer_struct {
+ char buffer[TRACE_BUF_SIZE];
+};
+
+static struct trace_buffer_struct *trace_percpu_buffer;
+static struct trace_buffer_struct *trace_percpu_sirq_buffer;
+static struct trace_buffer_struct *trace_percpu_irq_buffer;
+static struct trace_buffer_struct *trace_percpu_nmi_buffer;
+
+/*
+ * The buffer used is dependent on the context. There is a per cpu
+ * buffer for normal context, softirq contex, hard irq context and
+ * for NMI context. Thise allows for lockless recording.
+ *
+ * Note, if the buffers failed to be allocated, then this returns NULL
+ */
+static char *get_trace_buf(void)
+{
+ struct trace_buffer_struct *percpu_buffer;
+ struct trace_buffer_struct *buffer;
+
+ /*
+ * If we have allocated per cpu buffers, then we do not
+ * need to do any locking.
+ */
+ if (in_nmi())
+ percpu_buffer = trace_percpu_nmi_buffer;
+ else if (in_irq())
+ percpu_buffer = trace_percpu_irq_buffer;
+ else if (in_softirq())
+ percpu_buffer = trace_percpu_sirq_buffer;
+ else
+ percpu_buffer = trace_percpu_buffer;
+
+ if (!percpu_buffer)
+ return NULL;
+
+ buffer = per_cpu_ptr(percpu_buffer, smp_processor_id());
+
+ return buffer->buffer;
+}
+
+static int alloc_percpu_trace_buffer(void)
+{
+ struct trace_buffer_struct *buffers;
+ struct trace_buffer_struct *sirq_buffers;
+ struct trace_buffer_struct *irq_buffers;
+ struct trace_buffer_struct *nmi_buffers;
+
+ buffers = alloc_percpu(struct trace_buffer_struct);
+ if (!buffers)
+ goto err_warn;
+
+ sirq_buffers = alloc_percpu(struct trace_buffer_struct);
+ if (!sirq_buffers)
+ goto err_sirq;
+
+ irq_buffers = alloc_percpu(struct trace_buffer_struct);
+ if (!irq_buffers)
+ goto err_irq;
+
+ nmi_buffers = alloc_percpu(struct trace_buffer_struct);
+ if (!nmi_buffers)
+ goto err_nmi;
+
+ trace_percpu_buffer = buffers;
+ trace_percpu_sirq_buffer = sirq_buffers;
+ trace_percpu_irq_buffer = irq_buffers;
+ trace_percpu_nmi_buffer = nmi_buffers;
+
+ return 0;
+
+ err_nmi:
+ free_percpu(irq_buffers);
+ err_irq:
+ free_percpu(sirq_buffers);
+ err_sirq:
+ free_percpu(buffers);
+ err_warn:
+ WARN(1, "Could not allocate percpu trace_printk buffer");
+ return -ENOMEM;
+}
+
+void trace_printk_init_buffers(void)
+{
+ static int buffers_allocated;
+
+ if (buffers_allocated)
+ return;
+
+ if (alloc_percpu_trace_buffer())
+ return;
+
+ pr_info("ftrace: Allocated trace_printk buffers\n");
+
+ buffers_allocated = 1;
+}
+
/**
* trace_vbprintk - write binary msg to tracing buffer
*
*/
int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
{
- static arch_spinlock_t trace_buf_lock =
- (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
- static u32 trace_buf[TRACE_BUF_SIZE];
-
struct ftrace_event_call *call = &event_bprint;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
struct trace_array *tr = &global_trace;
- struct trace_array_cpu *data;
struct bprint_entry *entry;
unsigned long flags;
- int disable;
- int cpu, len = 0, size, pc;
+ char *tbuffer;
+ int len = 0, size, pc;
if (unlikely(tracing_selftest_running || tracing_disabled))
return 0;
@@ -1526,43 +1596,36 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
pc = preempt_count();
preempt_disable_notrace();
- cpu = raw_smp_processor_id();
- data = tr->data[cpu];
- disable = atomic_inc_return(&data->disabled);
- if (unlikely(disable != 1))
+ tbuffer = get_trace_buf();
+ if (!tbuffer) {
+ len = 0;
goto out;
+ }
- /* Lockdep uses trace_printk for lock tracing */
- local_irq_save(flags);
- arch_spin_lock(&trace_buf_lock);
- len = vbin_printf(trace_buf, TRACE_BUF_SIZE, fmt, args);
+ len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args);
- if (len > TRACE_BUF_SIZE || len < 0)
- goto out_unlock;
+ if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0)
+ goto out;
+ local_save_flags(flags);
size = sizeof(*entry) + sizeof(u32) * len;
buffer = tr->buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size,
flags, pc);
if (!event)
- goto out_unlock;
+ goto out;
entry = ring_buffer_event_data(event);
entry->ip = ip;
entry->fmt = fmt;
- memcpy(entry->buf, trace_buf, sizeof(u32) * len);
+ memcpy(entry->buf, tbuffer, sizeof(u32) * len);
if (!filter_check_discard(call, entry, buffer, event)) {
ring_buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc);
}
-out_unlock:
- arch_spin_unlock(&trace_buf_lock);
- local_irq_restore(flags);
-
out:
- atomic_dec_return(&data->disabled);
preempt_enable_notrace();
unpause_graph_tracing();
@@ -1588,58 +1651,53 @@ int trace_array_printk(struct trace_array *tr,
int trace_array_vprintk(struct trace_array *tr,
unsigned long ip, const char *fmt, va_list args)
{
- static arch_spinlock_t trace_buf_lock = __ARCH_SPIN_LOCK_UNLOCKED;
- static char trace_buf[TRACE_BUF_SIZE];
-
struct ftrace_event_call *call = &event_print;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
- struct trace_array_cpu *data;
- int cpu, len = 0, size, pc;
+ int len = 0, size, pc;
struct print_entry *entry;
- unsigned long irq_flags;
- int disable;
+ unsigned long flags;
+ char *tbuffer;
if (tracing_disabled || tracing_selftest_running)
return 0;
+ /* Don't pollute graph traces with trace_vprintk internals */
+ pause_graph_tracing();
+
pc = preempt_count();
preempt_disable_notrace();
- cpu = raw_smp_processor_id();
- data = tr->data[cpu];
- disable = atomic_inc_return(&data->disabled);
- if (unlikely(disable != 1))
+
+ tbuffer = get_trace_buf();
+ if (!tbuffer) {
+ len = 0;
goto out;
+ }
- pause_graph_tracing();
- raw_local_irq_save(irq_flags);
- arch_spin_lock(&trace_buf_lock);
- len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
+ len = vsnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args);
+ if (len > TRACE_BUF_SIZE)
+ goto out;
+ local_save_flags(flags);
size = sizeof(*entry) + len + 1;
buffer = tr->buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
- irq_flags, pc);
+ flags, pc);
if (!event)
- goto out_unlock;
+ goto out;
entry = ring_buffer_event_data(event);
entry->ip = ip;
- memcpy(&entry->buf, trace_buf, len);
+ memcpy(&entry->buf, tbuffer, len);
entry->buf[len] = '\0';
if (!filter_check_discard(call, entry, buffer, event)) {
ring_buffer_unlock_commit(buffer, event);
- ftrace_trace_stack(buffer, irq_flags, 6, pc);
+ ftrace_trace_stack(buffer, flags, 6, pc);
}
-
- out_unlock:
- arch_spin_unlock(&trace_buf_lock);
- raw_local_irq_restore(irq_flags);
- unpause_graph_tracing();
out:
- atomic_dec_return(&data->disabled);
preempt_enable_notrace();
+ unpause_graph_tracing();
return len;
}
@@ -1652,14 +1710,9 @@ EXPORT_SYMBOL_GPL(trace_vprintk);
static void trace_iterator_increment(struct trace_iterator *iter)
{
- /* Don't allow ftrace to trace into the ring buffers */
- ftrace_disable_cpu();
-
iter->idx++;
if (iter->buffer_iter[iter->cpu])
ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
-
- ftrace_enable_cpu();
}
static struct trace_entry *
@@ -1669,17 +1722,12 @@ peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts,
struct ring_buffer_event *event;
struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu];
- /* Don't allow ftrace to trace into the ring buffers */
- ftrace_disable_cpu();
-
if (buf_iter)
event = ring_buffer_iter_peek(buf_iter, ts);
else
event = ring_buffer_peek(iter->tr->buffer, cpu, ts,
lost_events);
- ftrace_enable_cpu();
-
if (event) {
iter->ent_size = ring_buffer_event_length(event);
return ring_buffer_event_data(event);
@@ -1769,11 +1817,8 @@ void *trace_find_next_entry_inc(struct trace_iterator *iter)
static void trace_consume(struct trace_iterator *iter)
{
- /* Don't allow ftrace to trace into the ring buffers */
- ftrace_disable_cpu();
ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts,
&iter->lost_events);
- ftrace_enable_cpu();
}
static void *s_next(struct seq_file *m, void *v, loff_t *pos)
@@ -1862,16 +1907,12 @@ static void *s_start(struct seq_file *m, loff_t *pos)
iter->cpu = 0;
iter->idx = -1;
- ftrace_disable_cpu();
-
if (cpu_file == TRACE_PIPE_ALL_CPU) {
for_each_tracing_cpu(cpu)
tracing_iter_reset(iter, cpu);
} else
tracing_iter_reset(iter, cpu_file);
- ftrace_enable_cpu();
-
iter->leftover = 0;
for (p = iter; p && l < *pos; p = s_next(m, p, &l))
;
@@ -2332,15 +2373,13 @@ static struct trace_iterator *
__tracing_open(struct inode *inode, struct file *file)
{
long cpu_file = (long) inode->i_private;
- void *fail_ret = ERR_PTR(-ENOMEM);
struct trace_iterator *iter;
- struct seq_file *m;
- int cpu, ret;
+ int cpu;
if (tracing_disabled)
return ERR_PTR(-ENODEV);
- iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+ iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter));
if (!iter)
return ERR_PTR(-ENOMEM);
@@ -2397,32 +2436,15 @@ __tracing_open(struct inode *inode, struct file *file)
tracing_iter_reset(iter, cpu);
}
- ret = seq_open(file, &tracer_seq_ops);
- if (ret < 0) {
- fail_ret = ERR_PTR(ret);
- goto fail_buffer;
- }
-
- m = file->private_data;
- m->private = iter;
-
mutex_unlock(&trace_types_lock);
return iter;
- fail_buffer:
- for_each_tracing_cpu(cpu) {
- if (iter->buffer_iter[cpu])
- ring_buffer_read_finish(iter->buffer_iter[cpu]);
- }
- free_cpumask_var(iter->started);
- tracing_start();
fail:
mutex_unlock(&trace_types_lock);
kfree(iter->trace);
- kfree(iter);
-
- return fail_ret;
+ seq_release_private(inode, file);
+ return ERR_PTR(-ENOMEM);
}
int tracing_open_generic(struct inode *inode, struct file *filp)
@@ -2458,11 +2480,10 @@ static int tracing_release(struct inode *inode, struct file *file)
tracing_start();
mutex_unlock(&trace_types_lock);
- seq_release(inode, file);
mutex_destroy(&iter->mutex);
free_cpumask_var(iter->started);
kfree(iter->trace);
- kfree(iter);
+ seq_release_private(inode, file);
return 0;
}
@@ -2974,7 +2995,14 @@ int tracer_init(struct tracer *t, struct trace_array *tr)
return t->init(tr);
}
-static int __tracing_resize_ring_buffer(unsigned long size)
+static void set_buffer_entries(struct trace_array *tr, unsigned long val)
+{
+ int cpu;
+ for_each_tracing_cpu(cpu)
+ tr->data[cpu]->entries = val;
+}
+
+static int __tracing_resize_ring_buffer(unsigned long size, int cpu)
{
int ret;
@@ -2985,19 +3013,32 @@ static int __tracing_resize_ring_buffer(unsigned long size)
*/
ring_buffer_expanded = 1;
- ret = ring_buffer_resize(global_trace.buffer, size);
+ ret = ring_buffer_resize(global_trace.buffer, size, cpu);
if (ret < 0)
return ret;
if (!current_trace->use_max_tr)
goto out;
- ret = ring_buffer_resize(max_tr.buffer, size);
+ ret = ring_buffer_resize(max_tr.buffer, size, cpu);
if (ret < 0) {
- int r;
+ int r = 0;
+
+ if (cpu == RING_BUFFER_ALL_CPUS) {
+ int i;
+ for_each_tracing_cpu(i) {
+ r = ring_buffer_resize(global_trace.buffer,
+ global_trace.data[i]->entries,
+ i);
+ if (r < 0)
+ break;
+ }
+ } else {
+ r = ring_buffer_resize(global_trace.buffer,
+ global_trace.data[cpu]->entries,
+ cpu);
+ }
- r = ring_buffer_resize(global_trace.buffer,
- global_trace.entries);
if (r < 0) {
/*
* AARGH! We are left with different
@@ -3019,14 +3060,21 @@ static int __tracing_resize_ring_buffer(unsigned long size)
return ret;
}
- max_tr.entries = size;
+ if (cpu == RING_BUFFER_ALL_CPUS)
+ set_buffer_entries(&max_tr, size);
+ else
+ max_tr.data[cpu]->entries = size;
+
out:
- global_trace.entries = size;
+ if (cpu == RING_BUFFER_ALL_CPUS)
+ set_buffer_entries(&global_trace, size);
+ else
+ global_trace.data[cpu]->entries = size;
return ret;
}
-static ssize_t tracing_resize_ring_buffer(unsigned long size)
+static ssize_t tracing_resize_ring_buffer(unsigned long size, int cpu_id)
{
int cpu, ret = size;
@@ -3042,12 +3090,19 @@ static ssize_t tracing_resize_ring_buffer(unsigned long size)
atomic_inc(&max_tr.data[cpu]->disabled);
}
- if (size != global_trace.entries)
- ret = __tracing_resize_ring_buffer(size);
+ if (cpu_id != RING_BUFFER_ALL_CPUS) {
+ /* make sure, this cpu is enabled in the mask */
+ if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ ret = __tracing_resize_ring_buffer(size, cpu_id);
if (ret < 0)
ret = -ENOMEM;
+out:
for_each_tracing_cpu(cpu) {
if (global_trace.data[cpu])
atomic_dec(&global_trace.data[cpu]->disabled);
@@ -3078,7 +3133,8 @@ int tracing_update_buffers(void)
mutex_lock(&trace_types_lock);
if (!ring_buffer_expanded)
- ret = __tracing_resize_ring_buffer(trace_buf_size);
+ ret = __tracing_resize_ring_buffer(trace_buf_size,
+ RING_BUFFER_ALL_CPUS);
mutex_unlock(&trace_types_lock);
return ret;
@@ -3102,7 +3158,8 @@ static int tracing_set_tracer(const char *buf)
mutex_lock(&trace_types_lock);
if (!ring_buffer_expanded) {
- ret = __tracing_resize_ring_buffer(trace_buf_size);
+ ret = __tracing_resize_ring_buffer(trace_buf_size,
+ RING_BUFFER_ALL_CPUS);
if (ret < 0)
goto out;
ret = 0;
@@ -3128,8 +3185,8 @@ static int tracing_set_tracer(const char *buf)
* The max_tr ring buffer has some state (e.g. ring->clock) and
* we want preserve it.
*/
- ring_buffer_resize(max_tr.buffer, 1);
- max_tr.entries = 1;
+ ring_buffer_resize(max_tr.buffer, 1, RING_BUFFER_ALL_CPUS);
+ set_buffer_entries(&max_tr, 1);
}
destroy_trace_option_files(topts);
@@ -3137,10 +3194,17 @@ static int tracing_set_tracer(const char *buf)
topts = create_trace_option_files(current_trace);
if (current_trace->use_max_tr) {
- ret = ring_buffer_resize(max_tr.buffer, global_trace.entries);
- if (ret < 0)
- goto out;
- max_tr.entries = global_trace.entries;
+ int cpu;
+ /* we need to make per cpu buffer sizes equivalent */
+ for_each_tracing_cpu(cpu) {
+ ret = ring_buffer_resize(max_tr.buffer,
+ global_trace.data[cpu]->entries,
+ cpu);
+ if (ret < 0)
+ goto out;
+ max_tr.data[cpu]->entries =
+ global_trace.data[cpu]->entries;
+ }
}
if (t->init) {
@@ -3642,30 +3706,82 @@ out_err:
goto out;
}
+struct ftrace_entries_info {
+ struct trace_array *tr;
+ int cpu;
+};
+
+static int tracing_entries_open(struct inode *inode, struct file *filp)
+{
+ struct ftrace_entries_info *info;
+
+ if (tracing_disabled)
+ return -ENODEV;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->tr = &global_trace;
+ info->cpu = (unsigned long)inode->i_private;
+
+ filp->private_data = info;
+
+ return 0;
+}
+
static ssize_t
tracing_entries_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
- struct trace_array *tr = filp->private_data;
- char buf[96];
- int r;
+ struct ftrace_entries_info *info = filp->private_data;
+ struct trace_array *tr = info->tr;
+ char buf[64];
+ int r = 0;
+ ssize_t ret;
mutex_lock(&trace_types_lock);
- if (!ring_buffer_expanded)
- r = sprintf(buf, "%lu (expanded: %lu)\n",
- tr->entries >> 10,
- trace_buf_size >> 10);
- else
- r = sprintf(buf, "%lu\n", tr->entries >> 10);
+
+ if (info->cpu == RING_BUFFER_ALL_CPUS) {
+ int cpu, buf_size_same;
+ unsigned long size;
+
+ size = 0;
+ buf_size_same = 1;
+ /* check if all cpu sizes are same */
+ for_each_tracing_cpu(cpu) {
+ /* fill in the size from first enabled cpu */
+ if (size == 0)
+ size = tr->data[cpu]->entries;
+ if (size != tr->data[cpu]->entries) {
+ buf_size_same = 0;
+ break;
+ }
+ }
+
+ if (buf_size_same) {
+ if (!ring_buffer_expanded)
+ r = sprintf(buf, "%lu (expanded: %lu)\n",
+ size >> 10,
+ trace_buf_size >> 10);
+ else
+ r = sprintf(buf, "%lu\n", size >> 10);
+ } else
+ r = sprintf(buf, "X\n");
+ } else
+ r = sprintf(buf, "%lu\n", tr->data[info->cpu]->entries >> 10);
+
mutex_unlock(&trace_types_lock);
- return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+ ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+ return ret;
}
static ssize_t
tracing_entries_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
+ struct ftrace_entries_info *info = filp->private_data;
unsigned long val;
int ret;
@@ -3680,7 +3796,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
/* value is in KB */
val <<= 10;
- ret = tracing_resize_ring_buffer(val);
+ ret = tracing_resize_ring_buffer(val, info->cpu);
if (ret < 0)
return ret;
@@ -3689,6 +3805,16 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
return cnt;
}
+static int
+tracing_entries_release(struct inode *inode, struct file *filp)
+{
+ struct ftrace_entries_info *info = filp->private_data;
+
+ kfree(info);
+
+ return 0;
+}
+
static ssize_t
tracing_total_entries_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -3700,7 +3826,7 @@ tracing_total_entries_read(struct file *filp, char __user *ubuf,
mutex_lock(&trace_types_lock);
for_each_tracing_cpu(cpu) {
- size += tr->entries >> 10;
+ size += tr->data[cpu]->entries >> 10;
if (!ring_buffer_expanded)
expanded_size += trace_buf_size >> 10;
}
@@ -3734,7 +3860,7 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
if (trace_flags & TRACE_ITER_STOP_ON_FREE)
tracing_off();
/* resize the ring buffer to 0 */
- tracing_resize_ring_buffer(0);
+ tracing_resize_ring_buffer(0, RING_BUFFER_ALL_CPUS);
return 0;
}
@@ -3933,9 +4059,10 @@ static const struct file_operations tracing_pipe_fops = {
};
static const struct file_operations tracing_entries_fops = {
- .open = tracing_open_generic,
+ .open = tracing_entries_open,
.read = tracing_entries_read,
.write = tracing_entries_write,
+ .release = tracing_entries_release,
.llseek = generic_file_llseek,
};
@@ -4387,6 +4514,9 @@ static void tracing_init_debugfs_percpu(long cpu)
trace_create_file("stats", 0444, d_cpu,
(void *) cpu, &tracing_stats_fops);
+
+ trace_create_file("buffer_size_kb", 0444, d_cpu,
+ (void *) cpu, &tracing_entries_fops);
}
#ifdef CONFIG_FTRACE_SELFTEST
@@ -4716,7 +4846,7 @@ static __init int tracer_init_debugfs(void)
(void *) TRACE_PIPE_ALL_CPU, &tracing_pipe_fops);
trace_create_file("buffer_size_kb", 0644, d_tracer,
- &global_trace, &tracing_entries_fops);
+ (void *) RING_BUFFER_ALL_CPUS, &tracing_entries_fops);
trace_create_file("buffer_total_size_kb", 0444, d_tracer,
&global_trace, &tracing_total_entries_fops);
@@ -4955,6 +5085,10 @@ __init static int tracer_alloc_buffers(void)
if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL))
goto out_free_buffer_mask;
+ /* Only allocate trace_printk buffers if a trace_printk exists */
+ if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt)
+ trace_printk_init_buffers();
+
/* To save memory, keep the ring buffer size to its minimum */
if (ring_buffer_expanded)
ring_buf_size = trace_buf_size;
@@ -4973,7 +5107,6 @@ __init static int tracer_alloc_buffers(void)
WARN_ON(1);
goto out_free_cpumask;
}
- global_trace.entries = ring_buffer_size(global_trace.buffer);
if (global_trace.buffer_disabled)
tracing_off();
@@ -4986,7 +5119,6 @@ __init static int tracer_alloc_buffers(void)
ring_buffer_free(global_trace.buffer);
goto out_free_cpumask;
}
- max_tr.entries = 1;
#endif
/* Allocate the first page for all buffers */
@@ -4995,6 +5127,11 @@ __init static int tracer_alloc_buffers(void)
max_tr.data[i] = &per_cpu(max_tr_data, i);
}
+ set_buffer_entries(&global_trace, ring_buf_size);
+#ifdef CONFIG_TRACER_MAX_TRACE
+ set_buffer_entries(&max_tr, 1);
+#endif
+
trace_init_cmdlines();
register_tracer(&nop_trace);