From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: hugh@veritas.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, npiggin@suse.de, riel@redhat.com,
mztabzr@0pointer.de, mpm@selenic.com
Subject: Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory
Date: Thu, 31 Jan 2008 09:44:00 +0100 [thread overview]
Message-ID: <1201769040.28547.245.camel@lappy> (raw)
In-Reply-To: <20080130144049.73596898.akpm@linux-foundation.org>
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@chello.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.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: hugh@veritas.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, npiggin@suse.de, riel@redhat.com,
mztabzr@0pointer.de, mpm@selenic.com
Subject: Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory
Date: Thu, 31 Jan 2008 09:44:00 +0100 [thread overview]
Message-ID: <1201769040.28547.245.camel@lappy> (raw)
In-Reply-To: <20080130144049.73596898.akpm@linux-foundation.org>
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@chello.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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next prev parent reply other threads:[~2008-01-31 8:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-30 17:28 [PATCH] mm: MADV_WILLNEED implementation for anonymous memory Peter Zijlstra
2008-01-30 17:28 ` [PATCH] mm: MADV_WILLNEED implementation for anonymous memory, " Peter Zijlstra
2008-01-30 18:15 ` [PATCH] " Matt Mackall
2008-01-30 18:15 ` Matt Mackall
2008-01-30 22:40 ` Andrew Morton
2008-01-30 22:40 ` Andrew Morton
2008-01-31 8:44 ` Peter Zijlstra [this message]
2008-01-31 8:44 ` Peter Zijlstra
2008-01-31 9:12 ` Andrew Morton
2008-01-31 9:12 ` Andrew Morton
2008-01-31 9:35 ` Peter Zijlstra
2008-01-31 9:35 ` Peter Zijlstra
2008-01-31 9:47 ` Andrew Morton
2008-01-31 9:47 ` Andrew Morton
2008-01-31 9:53 ` Peter Zijlstra
2008-01-31 9:53 ` Peter Zijlstra
2008-01-31 10:05 ` Andrew Morton
2008-01-31 10:05 ` Andrew Morton
2008-01-31 10:10 ` Peter Zijlstra
2008-01-31 10:10 ` Peter Zijlstra
2008-01-31 10:18 ` Andrew Morton
2008-01-31 10:18 ` Andrew Morton
2008-01-31 10:15 ` Andi Kleen
2008-01-31 10:15 ` Andi Kleen
2008-01-31 10:19 ` Andrew Morton
2008-01-31 10:19 ` Andrew Morton
2008-01-31 11:06 ` Andi Kleen
2008-01-31 11:06 ` Andi Kleen
2008-01-31 10:52 ` Rik van Riel
2008-01-31 10:52 ` Rik van Riel
2008-01-31 11:32 ` Andi Kleen
2008-01-31 11:32 ` Andi Kleen
2008-01-31 11:09 ` Rik van Riel
2008-01-31 11:09 ` Rik van Riel
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