linux-kernel - [tip:tracing/ftrace] init,cpuset: fix initialize order

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Message-ID: <tip-759ee0915dd713361e72facb78b66600b5712d65@git.kernel.org>
Date:	Wed, 25 Mar 2009 17:33:53 GMT
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	lizf@...fujitsu.com, menage@...gle.com, fweisbec@...il.com,
	akpm@...ux-foundation.org, srostedt@...hat.com, tglx@...utronix.de,
	miaox@...fujitsu.com, laijs@...fujitsu.com, mingo@...e.hu
Subject: [tip:tracing/ftrace] init,cpuset: fix initialize order

Commit-ID:  759ee0915dd713361e72facb78b66600b5712d65
Gitweb:     http://git.kernel.org/tip/759ee0915dd713361e72facb78b66600b5712d65
Author:     Lai Jiangshan <laijs@...fujitsu.com>
AuthorDate: Wed, 25 Mar 2009 17:06:30 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 25 Mar 2009 18:32:35 +0100

init,cpuset: fix initialize order

Impact: cpuset_wq should be initialized after init_workqueues()

When I read /debugfs/tracing/trace_stat/workqueues,
I got this:

 # CPU  INSERTED  EXECUTED   NAME
 # |      |         |          |

   0      0          0       cpuset
   0    285        285       events/0
   0      2          2       work_on_cpu/0
   0   1115       1115       khelper
   0    325        325       kblockd/0
   0      0          0       kacpid
   0      0          0       kacpi_notify
   0      0          0       ata/0
   0      0          0       ata_aux
   0      0          0       ksuspend_usbd
   0      0          0       aio/0
   0      0          0       nfsiod
   0      0          0       kpsmoused
   0      0          0       kstriped
   0      0          0       kondemand/0
   0      1          1       hid_compat
   0      0          0       rpciod/0

   1     64         64       events/1
   1      2          2       work_on_cpu/1
   1      5          5       kblockd/1
   1      0          0       ata/1
   1      0          0       aio/1
   1      0          0       kondemand/1
   1      0          0       rpciod/1

I found "cpuset" is at the earliest.

I found a create_singlethread_workqueue() is earlier than
init_workqueues():

kernel_init()
->cpuset_init_smp()
  ->create_singlethread_workqueue()
->do_basic_setup()
  ->init_workqueues()

I think it's better that create_singlethread_workqueue() is called
after workqueue subsystem has been initialized.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Acked-by: Steven Rostedt <srostedt@...hat.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Paul Menage <menage@...gle.com>
Cc: miaoxie <miaox@...fujitsu.com>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
LKML-Reference: <49C9F416.1050707@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 init/main.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/init/main.c b/init/main.c
index 20d784a..b0097d2 100644
--- a/init/main.c
+++ b/init/main.c
@@ -772,6 +772,7 @@ static void __init do_basic_setup(void)
 {
 	rcu_init_sched(); /* needed by module_init stage. */
 	init_workqueues();
+	cpuset_init_smp();
 	usermodehelper_init();
 	driver_init();
 	init_irq_proc();
@@ -865,8 +866,6 @@ static int __init kernel_init(void * unused)
 	smp_init();
 	sched_init_smp();
 
-	cpuset_init_smp();
-
 	do_basic_setup();
 
 	/*
--
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