linux-kernel - Re: [PATCH 01/19 v2] avr32/mm/fault.c: Port OOM changes to do_page

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Date:	Sun, 1 Apr 2012 19:08:20 -0700
From:	Håvard Skinnemoen <hskinnemoen@...il.com>
To:	Kautuk Consul <consul.kautuk@...il.com>
Cc:	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	linux-kernel@...r.kernel.org,
	"Mohd. Faris" <mohdfarisq2010@...il.com>
Subject: Re: [PATCH 01/19 v2] avr32/mm/fault.c: Port OOM changes to do_page_fault

On Sat, Mar 31, 2012 at 4:58 AM, 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.
>
> Port these changes to AVR32.
>
> Signed-off-by: Mohd. Faris <mohdfarisq2010@...il.com>
> Signed-off-by: Kautuk Consul <consul.kautuk@...il.com>

Looks very good, thanks.

> @@ -122,6 +124,7 @@ good_area:
>                if (!(vma->vm_flags & VM_WRITE))
>                        goto bad_area;
>                writeaccess = 1;
> +               flags |= FAULT_FLAG_WRITE;

Could you remove the 'writeaccess' variable as well? It looks unused
after applying your patch.

Ug...the avr32 arch is in a terrible state. Someone appears to have
removed the atmel_nand driver...

Havard
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