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

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Message-ID: <AANLkTi=cm8jQ5hY5qVA0bUvVemUGJvx-_B7-1sexGkvB@mail.gmail.com>
Date:	Mon, 11 Oct 2010 15:43:56 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, Ying Han <yinghan@...gle.com>,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...nel.dk>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/3] Retry page fault when blocking on disk transfer.

On Mon, Oct 11, 2010 at 3:25 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> Replacement patches are a bit cruel to people who've already reviewed
> the previous version.  I always turn them into deltas so I can see what
> was changed.  It is below.

Thanks Andrew. Sorry for the trouble, I'll know to avoid this next time.

> How well was the new swapin path tested?

Not as well as the file backed path - it's not gotten real production
use yet. However the plan is that this change will be in google's next
kernel update, so it will get a lot more more testing soon (starting
in ~1 week).

I did basic testing by dirtying an anon VMA larger that memory, then
accessing it in random order while another thread runs a mmap/munmap
loop, and checking that things behave as expected there (i.e. the
patch allows the mmap/munmap thread to progress without waiting for
the other thread swap-ins).

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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