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Message-Id: <20201106212935.28943-2-kan.liang@linux.intel.com>
Date: Fri, 6 Nov 2020 13:29:34 -0800
From: kan.liang@...ux.intel.com
To: peterz@...radead.org, mingo@...nel.org,
linux-kernel@...r.kernel.org
Cc: namhyung@...nel.org, eranian@...gle.com, irogers@...gle.com,
gmx@...gle.com, acme@...nel.org, jolsa@...hat.com,
ak@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 2/3] perf/x86/intel: Set PERF_ATTACH_SCHED_CB for large PEBS
From: Kan Liang <kan.liang@...ux.intel.com>
To supply a PID/TID for large PEBS, it requires flushing the PEBS buffer
in a context switch.
Set PERF_ATTACH_SCHED_CB for the event with large PEBS.
Fixes: 9c964efa4330 ("perf/x86/intel: Drain the PEBS buffer during context switches")
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
arch/x86/events/intel/core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index c79748f6921d..fe922be94b6d 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3565,8 +3565,10 @@ static int intel_pmu_hw_config(struct perf_event *event)
if (!(event->attr.freq || (event->attr.wakeup_events && !event->attr.watermark))) {
event->hw.flags |= PERF_X86_EVENT_AUTO_RELOAD;
if (!(event->attr.sample_type &
- ~intel_pmu_large_pebs_flags(event)))
+ ~intel_pmu_large_pebs_flags(event))) {
event->hw.flags |= PERF_X86_EVENT_LARGE_PEBS;
+ event->attach_state |= PERF_ATTACH_SCHED_CB;
+ }
}
if (x86_pmu.pebs_aliases)
x86_pmu.pebs_aliases(event);
--
2.17.1
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