linux-kernel - [tip:perfcounters/urgent] perf_counter: Complete counter swap

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Message-ID: <tip-19d2e755436054dfc2be640bffc32e427c37ac3d@git.kernel.org>
Date:	Fri, 26 Jun 2009 15:52:14 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perfcounters/urgent] perf_counter: Complete counter swap

Commit-ID:  19d2e755436054dfc2be640bffc32e427c37ac3d
Gitweb:     http://git.kernel.org/tip/19d2e755436054dfc2be640bffc32e427c37ac3d
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 26 Jun 2009 13:10:23 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 26 Jun 2009 17:48:54 +0200

perf_counter: Complete counter swap

Complete the counter swap by indeed switching the times too and
updating the userpage after modifying the counter values.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
LKML-Reference: <1246014623.31755.195.camel@...ns>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/perf_counter.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index f2f2326..66ab1e9 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1048,9 +1048,14 @@ static void __perf_counter_sync_stat(struct perf_counter *counter,
 	value = atomic64_xchg(&counter->count, value);
 	atomic64_set(&next_counter->count, value);
 
+	swap(counter->total_time_enabled, next_counter->total_time_enabled);
+	swap(counter->total_time_running, next_counter->total_time_running);
+
 	/*
-	 * XXX also sync time_enabled and time_running ?
+	 * Since we swizzled the values, update the user visible data too.
 	 */
+	perf_counter_update_userpage(counter);
+	perf_counter_update_userpage(next_counter);
 }
 
 #define list_next_entry(pos, member) \
--
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