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

[richard -rw- weinberger <richard.weinberger@xxxxxxxxx>]

On Tue, Mar 20, 2012 at 2:18 PM, Kautuk Consul <consul.kautuk@xxxxxxxxx> 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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