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

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Date:	Thu, 31 Jan 2008 09:44:00 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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


On Wed, 2008-01-30 at 14:40 -0800, Andrew Morton wrote:
> On Wed, 30 Jan 2008 18:28:59 +0100
> Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > Implement MADV_WILLNEED for anonymous pages by walking the page tables and
> > starting asynchonous swap cache reads for all encountered swap pages.
> 
> Why cannot this use (a perhaps suitably-modified) make_pages_present()?

Because make_pages_present() relies on page faults to bring data in and
will thus wait for all data to be present before returning.

This solution is async; it will just issue a read for the requested
pages and moves on.


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