linux-kernel - [PATCH v2 1/4] perf: Simplify group_sched

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Date:   Thu, 29 Oct 2020 17:27:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org
Cc:     linux-kernel@...r.kernel.org, eranian@...gle.com,
        ak@...ux.intel.com, peterz@...radead.org
Subject: [PATCH v2 1/4] perf: Simplify group_sched_out()

Since event_sched_out() clears cpuctx->exclusive upon removal of an
exclusive event (and only group leaders can be exclusive), there is no
point in group_sched_out() trying to do it too. It is impossible for
cpuctx->exclusive to still be set here.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/events/core.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2312,9 +2312,6 @@ group_sched_out(struct perf_event *group
 		event_sched_out(event, cpuctx, ctx);
 
 	perf_pmu_enable(ctx->pmu);
-
-	if (group_event->attr.exclusive)
-		cpuctx->exclusive = 0;
 }
 
 #define DETACH_GROUP	0x01UL