linux-kernel - [PATCH 2/3] perf/x86/intel: Set PERF_ATTACH_SCHED

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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