linux-kernel - [tip:perf/urgent] perf: Only update context time when active

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Message-ID: <tip-6f932e5be1503ab0783699e843db325d44c2fabb@git.kernel.org>
Date:	Thu, 25 Feb 2016 00:04:58 -0800
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, peterz@...radead.org,
	tglx@...utronix.de, mingo@...nel.org,
	alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
	acme@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf: Only update context time when active

Commit-ID:  6f932e5be1503ab0783699e843db325d44c2fabb
Gitweb:     http://git.kernel.org/tip/6f932e5be1503ab0783699e843db325d44c2fabb
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 24 Feb 2016 18:45:43 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 25 Feb 2016 08:42:33 +0100

perf: Only update context time when active

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: dvyukov@...gle.com
Cc: eranian@...gle.com
Cc: oleg@...hat.com
Cc: panand@...hat.com
Cc: sasha.levin@...cle.com
Cc: vince@...ter.net
Link: http://lkml.kernel.org/r/20160224174947.860690919@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index d5299e2..64698fb 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2170,12 +2170,12 @@ perf_install_in_context(struct perf_event_context *ctx,
 		raw_spin_unlock_irq(&ctx->lock);
 		return;
 	}
-	update_context_time(ctx);
-	/*
-	 * Update cgrp time only if current cgrp matches event->cgrp.
-	 * Must be done before calling add_event_to_ctx().
-	 */
-	update_cgrp_time_from_event(event);
+
+	if (ctx->is_active) {
+		update_context_time(ctx);
+		update_cgrp_time_from_event(event);
+	}
+
 	add_event_to_ctx(event, ctx);
 	raw_spin_unlock_irq(&ctx->lock);