From: ebiederm@xmission.com (Eric W. Biederman)
To: Andrea Arcangeli <andrea@suse.de>
Cc: Suleiman Souhlal <ssouhlal@FreeBSD.org>,
Badari Pulavarty <pbadari@us.ibm.com>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, hugh@veritas.com,
dvhltc@us.ibm.com, linux-mm@kvack.org, blaisorblade@yahoo.it,
jdike@addtoit.com
Subject: Re: differences between MADV_FREE and MADV_DONTNEED
Date: Mon, 16 Jan 2006 14:43:47 -0700 [thread overview]
Message-ID: <m1r777rgq4.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <20060116172449.GL15897@opteron.random> (Andrea Arcangeli's message of "Mon, 16 Jan 2006 18:24:49 +0100")
Andrea Arcangeli <andrea@suse.de> writes:
> On Mon, Jan 16, 2006 at 09:03:00AM -0800, Suleiman Souhlal wrote:
>> Andrea Arcangeli wrote:
>>
>> >We can also use it for the same purpose, we could add the pages to
>> >swapcache mark them dirty and zap the ptes _after_ that.
>>
>> Wouldn't that cause the pages to get swapped out immediately?
>
> Not really, it would be a non blocking operation. But they could be
> swapped out shortly later (that's the whole point of DONTNEED, right?),
> once there is more memory pressure. Otherwise if they're used again, a
> minor fault will happen and it will find the swapcache uptodate in ram.
As I recall the logic with DONTNEED was to mark the mapping of
the page clean so the page didn't need to be swapped out, it could
just be dropped.
That is why they anonymous and the file backed cases differ.
Part of the point is to avoid the case of swapping the pages out if
the application doesn't care what is on them anymore.
Eric
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next prev parent reply other threads:[~2006-01-16 21:43 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-26 22:49 [RFC] madvise(MADV_TRUNCATE) Badari Pulavarty
2005-10-27 8:38 ` Andi Kleen
2005-10-27 13:17 ` Andrea Arcangeli
2005-10-27 15:00 ` Badari Pulavarty
2005-10-27 15:11 ` Andrea Arcangeli
2005-10-27 18:20 ` Andrew Morton
2005-10-27 18:35 ` Badari Pulavarty
2005-10-27 18:50 ` Andrew Morton
2005-10-27 19:40 ` Gerrit Huizenga
2005-10-27 19:56 ` Andi Kleen
2005-10-27 23:21 ` Darren Hart
2005-10-27 20:05 ` Theodore Ts'o
2005-10-27 20:16 ` Andrea Arcangeli
2005-10-28 1:42 ` Badari Pulavarty
2005-10-28 16:33 ` Theodore Ts'o
2005-10-27 20:22 ` Jeff Dike
2005-10-27 20:04 ` Andrea Arcangeli
2005-10-27 20:50 ` Andrew Morton
2005-10-27 21:37 ` Andrea Arcangeli
2005-10-27 22:23 ` Andrew Morton
2005-10-27 23:05 ` Badari Pulavarty
2005-10-27 23:16 ` Andrew Morton
2005-10-27 23:33 ` Peter Chubb
2005-10-28 0:22 ` Andrea Arcangeli
2005-10-28 0:32 ` Andrew Morton
2005-10-28 1:10 ` Andrea Arcangeli
2005-10-28 1:27 ` Badari Pulavarty
2005-10-28 2:00 ` Andrew Morton
2005-10-27 22:32 ` Badari Pulavarty
2005-10-27 23:28 ` Peter Chubb
2005-10-27 23:49 ` Andrew Morton
2005-10-27 23:56 ` Nathan Scott
2005-10-28 0:15 ` Andrea Arcangeli
2005-10-27 23:59 ` Peter Chubb
2005-10-28 3:46 ` Jeff Dike
2005-10-28 11:03 ` Blaisorblade
2005-10-28 13:29 ` Andrea Arcangeli
2005-10-28 16:56 ` Blaisorblade
2005-10-28 16:16 ` Badari Pulavarty
2005-10-28 18:40 ` Blaisorblade
2005-10-28 18:56 ` Badari Pulavarty
2005-10-29 0:35 ` Badari Pulavarty
2005-10-28 16:19 ` Badari Pulavarty
2005-10-28 17:10 ` Blaisorblade
2005-10-28 18:28 ` Jeff Dike
2005-10-28 18:44 ` Blaisorblade
2005-10-28 18:42 ` Jeff Dike
2005-10-28 18:54 ` Badari Pulavarty
2005-10-29 0:03 ` Badari Pulavarty
2005-10-29 2:51 ` Jeff Dike
2005-10-31 16:34 ` Badari Pulavarty
2005-10-31 19:15 ` Badari Pulavarty
2005-10-31 19:49 ` [RFC][PATCH] madvise(MADV_TRUNCATE) Badari Pulavarty
2005-11-01 0:05 ` Jeff Dike
2005-11-02 1:15 ` [PATCH] 2.6.14 patch for supporting madvise(MADV_FREE) Badari Pulavarty
2005-11-02 1:43 ` Andrea Arcangeli
2005-11-02 15:49 ` Badari Pulavarty
2005-11-02 16:12 ` [PATCH] 2.6.14 patch for supporting madvise(MADV_REMOVE) Badari Pulavarty
2005-11-02 19:54 ` New bug in patch and existing Linux code - race with install_page() (was: Re: [PATCH] 2.6.14 patch for supporting madvise(MADV_REMOVE)) Blaisorblade
2005-11-02 20:12 ` Hugh Dickins
2005-11-02 20:45 ` Hugh Dickins
2005-11-02 21:36 ` Badari Pulavarty
2005-11-02 21:55 ` Hugh Dickins
2005-11-02 22:02 ` Badari Pulavarty
2005-11-12 0:25 ` [PATCH] 2.6.14 patch for supporting madvise(MADV_REMOVE) Andrew Morton
2005-11-12 0:34 ` Badari Pulavarty
2005-11-12 1:43 ` Andrew Morton
2005-11-12 4:41 ` Badari Pulavarty
2006-01-16 13:06 ` differences between MADV_FREE and MADV_DONTNEED Andrea Arcangeli
2006-01-16 16:02 ` Suleiman Souhlal
2006-01-16 16:28 ` Andrea Arcangeli
2006-01-16 17:03 ` Suleiman Souhlal
2006-01-16 17:24 ` Andrea Arcangeli
2006-01-16 21:43 ` Eric W. Biederman [this message]
2006-01-17 0:24 ` Suleiman Souhlal
2006-01-17 1:04 ` Nicholas Miell
2006-01-17 12:43 ` Christoph Hellwig
2006-01-17 18:23 ` Eric W. Biederman
2006-01-17 22:55 ` Nicholas Miell
2007-03-01 18:11 ` Samuel Thibault
2006-01-17 19:06 ` Badari Pulavarty
2006-01-17 1:06 ` Blaisorblade
2006-01-17 1:33 ` Andrea Arcangeli
2005-11-12 0:34 ` [PATCH] 2.6.14 patch for supporting madvise(MADV_REMOVE) Andrew Morton
2005-10-28 17:55 ` [RFC] madvise(MADV_TRUNCATE) Blaisorblade
2005-10-28 21:23 ` Theodore Ts'o
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