linux-kernel - [PATCH 3/4] perf tools: Unify swapper tasks naming

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Message-Id: <1251693921-6579-3-git-send-email-fweisbec@gmail.com>
Date:	Mon, 31 Aug 2009 06:45:20 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 3/4] perf tools: Unify swapper tasks naming

In perf tools, we hardcode the pid 0 cmdline resolving to "idle"
because the init task is not included in the COMM events.

But the idle tasks secondary cpus are resolved into their "init"
name through the COMM events.
We have then such strange result in perf report (ditto with trace):

    19.66%       init    [kernel]          [k] acpi_idle_enter_c1
    17.32%       [idle]  [kernel]          [k] acpi_idle_enter_c1

It's then better to unify the swapper tasks into a single init name.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/thread.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 3acd37f..7635928 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -85,7 +85,7 @@ register_idle_thread(struct rb_root *threads, struct thread **last_match)
 {
 	struct thread *thread = threads__findnew(0, threads, last_match);
 
-	if (!thread || thread__set_comm(thread, "[idle]")) {
+	if (!thread || thread__set_comm(thread, "[init]")) {
 		fprintf(stderr, "problem inserting idle task.\n");
 		exit(-1);
 	}
-- 
1.6.2.3

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