linux-kernel - Re: [PATCH v5 13/14] protect architectures where THREAD_SIZE >= PAGE

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Message-Id: <20121017151245.f11c4d18.akpm@linux-foundation.org>
Date:	Wed, 17 Oct 2012 15:12:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	<linux-mm@...ck.org>, <cgroups@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Tejun Heo <tj@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	<kamezawa.hiroyu@...fujitsu.com>, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>, <devel@...nvz.org>,
	<linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH v5 13/14] protect architectures where THREAD_SIZE >=
 PAGE_SIZE against fork bombs

On Tue, 16 Oct 2012 14:16:50 +0400
Glauber Costa <glommer@...allels.com> wrote:

> @@ -146,7 +146,7 @@ void __weak arch_release_thread_info(struct thread_info *ti)
>  static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
>  						  int node)
>  {
> -	struct page *page = alloc_pages_node(node, THREADINFO_GFP,
> +	struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,
>  					     THREAD_SIZE_ORDER);

yay, we actually used all this code for something ;)

I don't think we really saw a comprehensive list of what else the kmem
controller will be used for, but I believe that all other envisaged
applications will require slab accounting, yes?


So it appears that all we have at present is a
yet-another-fork-bomb-preventer, but one which requires that the
culprit be in a container?  That's reasonable, given your
hosted-environment scenario.  It's unclear (to me) that we should merge
all this code for only this feature.  Again, it would be good to have a
clear listing of and plan for other applications of this code.
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