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

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Message-ID: <alpine.DEB.2.02.1408010159500.4061@chino.kir.corp.google.com>
Date:	Fri, 1 Aug 2014 02:10:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Johannes Weiner <hannes@...xchg.org>
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 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?
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