linux-kernel - [tip:perf/core] Revert 'perf evlist: Fix creation of cpu map'

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Message-ID: <tip-879d77d0cbe20ad1d6099a1e16f03b72c0649828@git.kernel.org>
Date:	Mon, 21 May 2012 00:38:19 -0700
From:	tip-bot for Namhyung Kim <namhyung.kim@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	mingo@...hat.com, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	namhyung.kim@....com, namhyung@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] Revert 'perf evlist: Fix creation of cpu map'

Commit-ID:  879d77d0cbe20ad1d6099a1e16f03b72c0649828
Gitweb:     http://git.kernel.org/tip/879d77d0cbe20ad1d6099a1e16f03b72c0649828
Author:     Namhyung Kim <namhyung.kim@....com>
AuthorDate: Wed, 16 May 2012 18:45:48 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 16 May 2012 12:12:05 -0300

Revert 'perf evlist: Fix creation of cpu map'

The commit 55261f46702c ("perf evlist: Fix creation of cpu map") changed
to create a per-task event when no cpu target is specified. However it
caused a problem since perf-task do not allow event inheritance due to
scalability issues so that the result will contain samples only from
parent, not from its children.

So we should use perf-task-per-cpu events anyway to get the right
result. Revert it.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Analysed-by: Ingo Molnar <mingo@...nel.org>
Acked-and-tested-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Namhyung Kim <namhyung.kim@....com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1337161549-9870-2-git-send-email-namhyung.kim@lge.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 80bef28..87889f3 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -609,10 +609,10 @@ int perf_evlist__create_maps(struct perf_evlist *evlist,
 	if (evlist->threads == NULL)
 		return -1;
 
-	if (perf_target__has_cpu(target))
-		evlist->cpus = cpu_map__new(target->cpu_list);
-	else
+	if (perf_target__has_task(target))
 		evlist->cpus = cpu_map__dummy_new();
+	else
+		evlist->cpus = cpu_map__new(target->cpu_list);
 
 	if (evlist->cpus == NULL)
 		goto out_delete_threads;
--
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