linux-kernel - [PATCH 2/6] Revert 'perf evlist: Fix creation of cpu map'

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Date:	Sat, 19 May 2012 23:16:32 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung.kim@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 2/6] Revert 'perf evlist: Fix creation of cpu map'

From: Namhyung Kim <namhyung.kim@....com>

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 file 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;
-- 
1.7.9.2.358.g22243

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