linux-kernel - [tip:perf/core] perf_event: Make software events work again

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Message-ID: <tip-6e85158cf5a2385264316870256fb6ad681156a0@git.kernel.org>
Date:	Sat, 8 May 2010 11:18:37 GMT
From:	tip-bot for Paul Mackerras <paulus@...ba.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, peterz@...radead.org, fweisbec@...il.com,
	ming.m.lin@...el.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] perf_event: Make software events work again

Commit-ID:  6e85158cf5a2385264316870256fb6ad681156a0
Gitweb:     http://git.kernel.org/tip/6e85158cf5a2385264316870256fb6ad681156a0
Author:     Paul Mackerras <paulus@...ba.org>
AuthorDate: Sat, 8 May 2010 20:58:00 +1000
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 8 May 2010 13:16:55 +0200

perf_event: Make software events work again

Commit 6bde9b6ce0127e2a56228a2071536d422be31336 ("perf: Add
group scheduling transactional APIs") added code to allow a
group to be scheduled in a single transaction.  However, it
introduced a bug in handling events whose pmu does not implement
transactions -- at the end of scheduling in the events in the
group, in the non-transactional case the code now falls through
to the group_error label, and proceeds to unschedule all the
events in the group and return failure.

This fixes it by returning 0 (success) in the non-transactional
case.

Signed-off-by: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Lin Ming <ming.m.lin@...el.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: eranian@...il.com
LKML-Reference: <20100508105800.GB10650@...ck.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/perf_event.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index bb06382..180151f 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -664,13 +664,13 @@ group_sched_in(struct perf_event *group_event,
 		}
 	}
 
-	if (txn) {
-		ret = pmu->commit_txn(pmu);
-		if (!ret) {
-			pmu->cancel_txn(pmu);
+	if (!txn)
+		return 0;
 
-			return 0;
-		}
+	ret = pmu->commit_txn(pmu);
+	if (!ret) {
+		pmu->cancel_txn(pmu);
+		return 0;
 	}
 
 group_error:
--
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