linux-kernel - Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory

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Date:	Thu, 31 Jan 2008 11:15:08 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, hugh@...itas.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, npiggin@...e.de,
	riel@...hat.com, mztabzr@...inter.de, mpm@...enic.com
Subject: Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory

Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:
>
> Ah, that is Lennarts Pulse Audio thing, he has samples in memory which
> might not have been used for a while, and he wants to be able to
> pre-fetch those when he suspects they might need to be played. So that
> once the audio thread comes along and stuffs them down /dev/dsp its all
> nice in memory.

The real problem that seems to make swapping so slow is that the data
tends to be badly fragmented on the swap partition. I suspect if that
problem was attached the need for such prefetching would be far less
because swap in would be much faster.

-Andi
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