linux-kernel - [tip:perfcounters/core] perf_counter: Add a comm hook for pure fork()s

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Message-ID: <tip-226f62fdd53d5b2c74e242aa11f6ad43d0285d3f@git.kernel.org>
Date:	Wed, 3 Jun 2009 13:06:33 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, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, jkacur@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, mtosatti@...hat.com,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: Add a comm hook for pure fork()s

Commit-ID:  226f62fdd53d5b2c74e242aa11f6ad43d0285d3f
Gitweb:     http://git.kernel.org/tip/226f62fdd53d5b2c74e242aa11f6ad43d0285d3f
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 3 Jun 2009 11:23:56 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 3 Jun 2009 14:14:30 +0200

perf_counter: Add a comm hook for pure fork()s

I noticed missing COMM events and found that we missed
reporting them for pure forks.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: John Kacur <jkacur@...hat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/fork.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 23bf757..b7d7a9f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1412,6 +1412,12 @@ long do_fork(unsigned long clone_flags,
 		if (clone_flags & CLONE_VFORK) {
 			p->vfork_done = &vfork;
 			init_completion(&vfork);
+		} else {
+			/*
+			 * vfork will do an exec which will call
+			 * set_task_comm()
+			 */
+			perf_counter_comm(p);
 		}
 
 		audit_finish_fork(p);
--
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