linux-kernel - Re: [PATCH 0/20] mmu: arch/mm: Port OOM changes to arch page fault handlers.

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Date:	Tue, 20 Mar 2012 14:30:49 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Kautuk Consul <consul.kautuk@...il.com>
Cc:	linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux@...ts.openrisc.net, linux-am33-list@...hat.com,
	microblaze-uclinux@...e.uq.edu.au, linux-m68k@...ts.linux-m68k.org,
	linux-m32r-ja@...linux-m32r.org, linux-ia64@...r.kernel.org,
	linux-hexagon@...r.kernel.org, linux-cris-kernel@...s.com,
	linux-sh@...r.kernel.org, linux-parisc@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/20] mmu: arch/mm: Port OOM changes to arch page fault handlers.

On Tue, Mar 20, 2012 at 2:18 PM, Kautuk Consul <consul.kautuk@...il.com> wrote:
> Commit d065bd810b6deb67d4897a14bfe21f8eb526ba99
> (mm: retry page fault when blocking on disk transfer) and
> commit 37b23e0525d393d48a7d59f870b3bc061a30ccdb
> (x86,mm: make pagefault killable)
>
> The above commits introduced changes into the x86 pagefault handler
> for making the page fault handler retryable as well as killable.
>
> These changes reduce the mmap_sem hold time, which is crucial
> during OOM killer invocation.
>
> I was facing hang and livelock problems on my ARM and MIPS boards when
> I invoked OOM by running the stress_32k.c test-case attached to this email.
>
> Since both the ARM and MIPS porting chainges were accepted, me and my
> co-worker decided to take the initiative to port these changes to all other
> MMU based architectures.
>
> Please review and do write back if there is any way I need to
> improve/rewrite any
> of these patches.
>

What about arch/um/?
Does UML not need this change?

-- 
Thanks,
//richard
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