linux-kernel - [tip: perf/urgent] perf: Simplify group_sched

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Date:   Tue, 10 Nov 2020 12:45:19 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/urgent] perf: Simplify group_sched_out()

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     8c7855d82933bab7fa5e96f0e568fc125c2e1ab4
Gitweb:        https://git.kernel.org/tip/8c7855d82933bab7fa5e96f0e568fc125c2e1ab4
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Thu, 29 Oct 2020 16:28:25 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 09 Nov 2020 18:12:35 +01:00

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>
Link: https://lkml.kernel.org/r/20201029162901.904060564@infradead.org
---
 kernel/events/core.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index d67c9cb..9a57366 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2312,9 +2312,6 @@ group_sched_out(struct perf_event *group_event,
 		event_sched_out(event, cpuctx, ctx);
 
 	perf_pmu_enable(ctx->pmu);
-
-	if (group_event->attr.exclusive)
-		cpuctx->exclusive = 0;
 }
 
 #define DETACH_GROUP	0x01UL