linux-kernel - Re: [PATCH -mm 2/3] cgroup: simplify init

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Message-ID: <47F46436.3060607@cn.fujitsu.com>
Date:	Thu, 03 Apr 2008 12:59:34 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	containers@...ts.linux-foundation.org
Subject: Re: [PATCH -mm 2/3] cgroup: simplify init_subsys()

Paul Menage wrote:
> On Tue, Apr 1, 2008 at 7:16 PM, Li Zefan <lizf@...fujitsu.com> wrote:
>>  -
>>  -       /* If this subsystem requested that it be notified with fork
>>  -        * events, we should send it one now for every process in the
>>  -        * system */
>>  -       if (ss->fork) {
>>  -               struct task_struct *g, *p;
>>  -
>>  -               read_lock(&tasklist_lock);
>>  -               do_each_thread(g, p) {
>>  -                       ss->fork(ss, p);
>>  -               } while_each_thread(g, p);
>>  -               read_unlock(&tasklist_lock);
>>  -       }
> 
> Should we maybe call ss->fork(ss, &init_task) ? Or just document that
> ss->fork() explicitly doesn't get called for init.
> 
> Maybe also add some BUG()s to confirm that no other tasks have in fact
> been forked by this point?
> 

At system boot, before all the subsystems have been registered, no processes
including init has been forked, am I right? So the fork callback will be
invoked when the init process is forked, so we don't need to call
ss->fork(ss, &init_task).

I'll add a BUG_ON(), and update the document about the fork callback.

Regards,
Li Zefan
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