Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH] perf: Make clock software events consistent with general exclusion rules | Date | Fri, 9 Apr 2010 14:02:47 +0200 |
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The cpu/task clock events implement their own version of exclusion on top of exclude_user and exclude_kernel.
The result is that when the event triggered in the kernel but we have exclude_kernel set, we try to rewind using task_pt_regs. There are two side effects of this:
- we call task_pt_regs even on kernel threads, which doesn't give us the desired result. - if the event occured in the kernel, we shouldn't rewind to the user context. We want to actually ignore the event.
get_irq_regs() will always give us the right interrupted context, so use its result and submit it to perf_exclude_context() that knows when an event must be ignored.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> --- kernel/perf_event.c | 9 +-------- 1 files changed, 1 insertions(+), 8 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index c953cfb..2d8b67c 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -4163,15 +4163,8 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer) perf_sample_data_init(&data, 0); data.period = event->hw.last_period; regs = get_irq_regs(); - /* - * In case we exclude kernel IPs or are somehow not in interrupt - * context, provide the next best thing, the user IP. - */ - if ((event->attr.exclude_kernel || !regs) && - !event->attr.exclude_user) - regs = task_pt_regs(current); - if (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; -- 1.6.2.3
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