linux-kernel - Re: [patch 2/3] mm, oom: remove unnecessary check for NULL zonelist

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Message-ID: <20140801133444.GH9952@cmpxchg.org>
Date:	Fri, 1 Aug 2014 09:34:44 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 2/3] mm, oom: remove unnecessary check for NULL zonelist

On Fri, Aug 01, 2014 at 02:10:37AM -0700, David Rientjes wrote:
> On Thu, 31 Jul 2014, Johannes Weiner wrote:
> 
> > out_of_memory() wants the zonelist that was used during allocation,
> > not just the random first node's zonelist that's simply picked to
> > serialize page fault OOM kills system-wide.
> > 
> > This would even change how panic_on_oom behaves for page fault OOMs
> > (in a completely unpredictable way) if we get CONSTRAINED_CPUSET.
> > 
> > This change makes no sense to me.
> > 
> 
> Allocations during fault will be constrained by the cpuset's mems, if we 
> are oom then why would we panic when panic_on_oom == 1?

Can you please address the concerns I raised?

And please describe user-visible changes in the changelog.
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