From: Frederic Weisbecker Date: Thu, 8 Apr 2010 22:28:14 +0000 (+0200) Subject: perf: Make clock software events consistent with general exclusion rules X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=df8290bf7ea6b3051e2f315579a6e829309ec1ed;p=openwrt%2Fstaging%2Fblogic.git perf: Make clock software events consistent with general exclusion rules 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 Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Paul Mackerras Cc: Ingo Molnar --- diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 9efdfe5b8d3b..095101d685bc 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -4164,15 +4164,8 @@ 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;