From: Suleiman Souhlal <ssouhlal@FreeBSD.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrea Arcangeli <andrea@suse.de>,
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 16:24:02 -0800 [thread overview]
Message-ID: <43CC3922.2070205@FreeBSD.org> (raw)
In-Reply-To: <m1r777rgq4.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
> 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.
Well, imho, MADV_DONTNEED should mean "I won't need this anytime soon",
and MADV_FREE "I will never need this again".
-- Suleiman
WARNING: multiple messages have this Message-ID (diff)
From: Suleiman Souhlal <ssouhlal@FreeBSD.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrea Arcangeli <andrea@suse.de>,
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 16:24:02 -0800 [thread overview]
Message-ID: <43CC3922.2070205@FreeBSD.org> (raw)
In-Reply-To: <m1r777rgq4.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
> 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.
Well, imho, MADV_DONTNEED should mean "I won't need this anytime soon",
and MADV_FREE "I will never need this again".
-- Suleiman
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next prev parent reply other threads:[~2006-01-17 0:24 UTC|newest]
Thread overview: 114+ 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 1:43 ` Andrea Arcangeli
2005-11-02 15:49 ` Badari Pulavarty
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 19:54 ` Blaisorblade
2005-11-02 20:12 ` Hugh Dickins
2005-11-02 20:12 ` Hugh Dickins
2005-11-02 20:45 ` Hugh Dickins
2005-11-02 20:45 ` Hugh Dickins
2005-11-02 21:36 ` Badari Pulavarty
2005-11-02 21:36 ` Badari Pulavarty
2005-11-02 21:55 ` Hugh Dickins
2005-11-02 21:55 ` Hugh Dickins
2005-11-02 22:02 ` Badari Pulavarty
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 0:25 ` Andrew Morton
2005-11-12 0:34 ` Badari Pulavarty
2005-11-12 0:34 ` Badari Pulavarty
2005-11-12 1:43 ` Andrew Morton
2005-11-12 1:43 ` Andrew Morton
2005-11-12 4:41 ` Badari Pulavarty
2005-11-12 4:41 ` Badari Pulavarty
2006-01-16 13:06 ` differences between MADV_FREE and MADV_DONTNEED Andrea Arcangeli
2006-01-16 13:06 ` Andrea Arcangeli
2006-01-16 16:02 ` Suleiman Souhlal
2006-01-16 16:02 ` Suleiman Souhlal
2006-01-16 16:28 ` Andrea Arcangeli
2006-01-16 16:28 ` Andrea Arcangeli
2006-01-16 17:03 ` Suleiman Souhlal
2006-01-16 17:03 ` Suleiman Souhlal
2006-01-16 17:24 ` Andrea Arcangeli
2006-01-16 17:24 ` Andrea Arcangeli
2006-01-16 21:43 ` Eric W. Biederman
2006-01-16 21:43 ` Eric W. Biederman
2006-01-17 0:24 ` Suleiman Souhlal [this message]
2006-01-17 0:24 ` Suleiman Souhlal
2006-01-17 1:04 ` Nicholas Miell
2006-01-17 1:04 ` Nicholas Miell
2006-01-17 12:43 ` Christoph Hellwig
2006-01-17 12:43 ` Christoph Hellwig
2006-01-17 18:23 ` Eric W. Biederman
2006-01-17 18:23 ` Eric W. Biederman
2006-01-17 22:55 ` Nicholas Miell
2006-01-17 22:55 ` Nicholas Miell
2007-03-01 18:11 ` Samuel Thibault
2007-03-01 18:11 ` Samuel Thibault
2006-01-17 19:06 ` Badari Pulavarty
2006-01-17 19:06 ` Badari Pulavarty
2006-01-17 1:06 ` Blaisorblade
2006-01-17 1:06 ` Blaisorblade
2006-01-17 1:33 ` Andrea Arcangeli
2006-01-17 1:33 ` Andrea Arcangeli
2005-11-12 0:34 ` [PATCH] 2.6.14 patch for supporting madvise(MADV_REMOVE) Andrew Morton
2005-11-12 0:34 ` Andrew Morton
2005-10-28 17:55 ` [RFC] madvise(MADV_TRUNCATE) Blaisorblade
2005-10-28 21:23 ` Theodore Ts'o
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