linux-kernel - Re: [PATCH 2/3] Retry page fault when blocking on disk transfer.

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Date:	Tue, 5 Oct 2010 10:33:37 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, Ying Han <yinghan@...gle.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Nick Piggin <npiggin@...nel.dk>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/3] Retry page fault when blocking on disk transfer.

On Tue, Oct 5, 2010 at 12:53 AM, Michel Lespinasse <walken@...gle.com> wrote:
>
> This change reduces mmap_sem hold times that are caused by waiting for
> disk transfers when accessing file mapped VMAs.

Ok, this series looks much better. The new mm/filemap.c diff looks
much better with the lock_page_or_retry() helper function, and on the
whole I think I can Ack this (although obviously not actually apply it
- but please do get it into linux-next).

The do_page_fault() part of the patch still looks ugly, but I don't
see any obvious way to improve on it.

                        Linus
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