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Date: Wed, 2 Jun 2010 13:31:41 -0700 From: Paul Menage <menage@...gle.com> To: Oleg Nesterov <oleg@...hat.com> Cc: Ben Blum <bblum@...rew.cmu.edu>, linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org, akpm@...ux-foundation.org, ebiederm@...ssion.com, lizf@...fujitsu.com, matthltc@...ibm.com Subject: Re: [RFC] [PATCH 2/2] cgroups: make procs file writable On Wed, Jun 2, 2010 at 1:20 PM, Oleg Nesterov <oleg@...hat.com> wrote: > > Yes sure. The main thread can exit via sys_exit(), this doesn't affect > the thread group. Of course, I am not saying this is common practice, > perhaps no "important" app does this. This check has been in cgroups for quite a while and no-one's complained so far... > But I still can't understand why we can't just remove it. Both > cgroup_attach_task() and cgroup_attach_proc() should handle the > possible races correctly anyway. The "it" that you're proposing to remove is in fact the code that handles those races. Anyway, I think this issue is orthogonal to the movability of entire processes - with Ben's patch, an exited-but-not-reaped group leader is immovable either via "tasks" or "cgroup.procs". Changing the race condition handling to allow such movement would be a separate issue. Paul Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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