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| author | Tejun Heo <tj@kernel.org> | 2010-04-05 04:37:28 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2010-04-05 04:37:28 +0200 |
| commit | 336f5899d287f06d8329e208fc14ce50f7ec9698 (patch) | |
| tree | 9b762d450d5eb248a6ff8317badb7e223d93ed58 /kernel/perf_event.c | |
| parent | staging/otus: include slab.h from usbdrv.h (diff) | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 (diff) | |
| download | linux-336f5899d287f06d8329e208fc14ce50f7ec9698.tar.xz linux-336f5899d287f06d8329e208fc14ce50f7ec9698.zip | |
Merge branch 'master' into export-slabh
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index a77266e3e3e1..2f3fbf84215a 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -1165,11 +1165,9 @@ void perf_event_task_sched_out(struct task_struct *task, struct perf_event_context *ctx = task->perf_event_ctxp; struct perf_event_context *next_ctx; struct perf_event_context *parent; - struct pt_regs *regs; int do_switch = 1; - regs = task_pt_regs(task); - perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, regs, 0); + perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0); if (likely(!ctx || !cpuctx->task_ctx)) return; @@ -2787,12 +2785,11 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) return NULL; } -#ifdef CONFIG_EVENT_TRACING __weak void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip) { } -#endif + /* * Output @@ -3379,15 +3376,23 @@ static void perf_event_task_output(struct perf_event *event, struct perf_task_event *task_event) { struct perf_output_handle handle; - int size; struct task_struct *task = task_event->task; - int ret; + unsigned long flags; + int size, ret; + + /* + * If this CPU attempts to acquire an rq lock held by a CPU spinning + * in perf_output_lock() from interrupt context, it's game over. + */ + local_irq_save(flags); size = task_event->event_id.header.size; ret = perf_output_begin(&handle, event, size, 0, 0); - if (ret) + if (ret) { + local_irq_restore(flags); return; + } task_event->event_id.pid = perf_event_pid(event, task); task_event->event_id.ppid = perf_event_pid(event, current); @@ -3398,6 +3403,7 @@ static void perf_event_task_output(struct perf_event *event, perf_output_put(&handle, task_event->event_id); perf_output_end(&handle); + local_irq_restore(flags); } static int perf_event_task_match(struct perf_event *event) |