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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-19 09:43:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-19 09:43:19 -0700 |
| commit | d46c7d9ab8289f23a5e161060b84fd7e63de7921 (patch) | |
| tree | 347f049f3c3c9dcd0c8e9edd459d7d6b9bbacfaf /kernel | |
| parent | c124891f50f11e33acdfa276864ea089bab726b6 (diff) | |
| parent | b395cd8a74b4a8d943dd4b5585e676f62f7350b3 (diff) | |
| download | lwn-d46c7d9ab8289f23a5e161060b84fd7e63de7921.tar.gz lwn-d46c7d9ab8289f23a5e161060b84fd7e63de7921.zip | |
Merge branch 'perfcounters-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perfcounters-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
perf tools: Make 'make html' work
perf annotate: Fix segmentation fault
perf_counter: Fix the PARISC build
perf_counter: Check task on counter read IPI
perf: Rename perf-examples.txt to examples.txt
perf record: Fix typo in pid_synthesize_comm_event
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/perf_counter.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 534e20d14d63..36f65e2b8b57 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1503,10 +1503,21 @@ static void perf_counter_enable_on_exec(struct task_struct *task) */ static void __perf_counter_read(void *info) { + struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context); struct perf_counter *counter = info; struct perf_counter_context *ctx = counter->ctx; unsigned long flags; + /* + * If this is a task context, we need to check whether it is + * the current task context of this cpu. If not it has been + * scheduled out before the smp call arrived. In that case + * counter->count would have been updated to a recent sample + * when the counter was scheduled out. + */ + if (ctx->task && cpuctx->task_ctx != ctx) + return; + local_irq_save(flags); if (ctx->is_active) update_context_time(ctx); @@ -2008,6 +2019,10 @@ int perf_counter_task_disable(void) return 0; } +#ifndef PERF_COUNTER_INDEX_OFFSET +# define PERF_COUNTER_INDEX_OFFSET 0 +#endif + static int perf_counter_index(struct perf_counter *counter) { if (counter->state != PERF_COUNTER_STATE_ACTIVE) |