linux-kernel - Re: [PATCH] cgroup(fix critical bug): new handling for tasks file

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Message-ID: <48B69582.4000208@cn.fujitsu.com>
Date:	Thu, 28 Aug 2008 20:09:38 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH] cgroup(fix critical bug): new handling for tasks file

Paul Menage wrote:
> On Tue, Aug 26, 2008 at 9:29 PM, Lai Jiangshan <laijs@...fujitsu.com> wrote:
>> And vmalloc can malloc larger memory than kmalloc, is vmalloc() enough?
>> If not, I think using an array of pages is the best choice.
> 
> vmalloc would be simpler, certainly, but it has a higher overhead. And
> since we're dealing with arrays of integers here, it's not too hard to
> manage multiple arrays. Oh, except for sorting them, which would be
> more of a pain. So yes, maybe vmalloc() would be a better choice at
> first.
> 
Yep, these are hard. Which method is your favorite?

My original purpose was to fix a bug as I described. 
This bug and the problem that offering big enough array for a huge
cgroup are orthogonal!

Could you consider/test that is it a bug as I described(and is it as
critical as I described, maybe I was too nervous)?
And this is also a problem: opening a cgroup.tasks twice or will waste
a lot of _physical_ memory.

    Thanks! Lai

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