From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Wu Fengguang <fengguang.wu@intel.com>,
hannes@cmpxchg.org, riel@redhat.com,
linux-kernel@vger.kernel.org, tytso@mit.edu, linux-mm@kvack.org,
elladan@eskimo.com, npiggin@suse.de, cl@linux-foundation.org,
minchan.kim@gmail.com
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen
Date: Sun, 10 May 2009 14:45:33 +0100 [thread overview]
Message-ID: <20090510144533.167010a9@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <2f11576a0905100236u15d45f7fm32d470776659cfec@mail.gmail.com>
On Sun, 10 May 2009 18:36:19 +0900
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> I don't oppose this policy. PROT_EXEC seems good viewpoint.
I don't think it is that simple
Not only can it be abused but some systems such as java have large
PROT_EXEC mapped environments, as do many other JIT based languages.
Secondly it moves the pressure from the storage volume holding the system
binaries and libraries to the swap device which already has to deal with
a lot of random (and thus expensive) I/O, as well as the users filestore
for mapped objects there - which may even be on a USB thumbdrive.
I still think the focus is on the wrong thing. We shouldn't be trying to
micro-optimise page replacement guesswork - we should be macro-optimising
the resulting I/O performance. My disks each do 50MBytes/second and even with the
Gnome developers finest creations that ought to be enough if the rest of
the system was working properly.
WARNING: multiple messages have this Message-ID (diff)
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Wu Fengguang <fengguang.wu@intel.com>,
hannes@cmpxchg.org, riel@redhat.com,
linux-kernel@vger.kernel.org, tytso@mit.edu, linux-mm@kvack.org,
elladan@eskimo.com, npiggin@suse.de, cl@linux-foundation.org,
minchan.kim@gmail.com
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen
Date: Sun, 10 May 2009 14:45:33 +0100 [thread overview]
Message-ID: <20090510144533.167010a9@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <2f11576a0905100236u15d45f7fm32d470776659cfec@mail.gmail.com>
On Sun, 10 May 2009 18:36:19 +0900
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> I don't oppose this policy. PROT_EXEC seems good viewpoint.
I don't think it is that simple
Not only can it be abused but some systems such as java have large
PROT_EXEC mapped environments, as do many other JIT based languages.
Secondly it moves the pressure from the storage volume holding the system
binaries and libraries to the swap device which already has to deal with
a lot of random (and thus expensive) I/O, as well as the users filestore
for mapped objects there - which may even be on a USB thumbdrive.
I still think the focus is on the wrong thing. We shouldn't be trying to
micro-optimise page replacement guesswork - we should be macro-optimising
the resulting I/O performance. My disks each do 50MBytes/second and even with the
Gnome developers finest creations that ought to be enough if the rest of
the system was working properly.
--
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next prev parent reply other threads:[~2009-05-10 13:47 UTC|newest]
Thread overview: 336+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-28 4:44 Swappiness vs. mmap() and interactive response Elladan
2009-04-28 5:35 ` KOSAKI Motohiro
2009-04-28 5:35 ` KOSAKI Motohiro
2009-04-28 6:36 ` Elladan
2009-04-28 6:36 ` Elladan
2009-04-28 6:52 ` KOSAKI Motohiro
2009-04-28 6:52 ` KOSAKI Motohiro
2009-04-28 7:26 ` Elladan
2009-04-28 7:26 ` Elladan
2009-04-28 7:44 ` KOSAKI Motohiro
2009-04-28 7:44 ` KOSAKI Motohiro
2009-04-28 7:48 ` Peter Zijlstra
2009-04-28 7:48 ` Peter Zijlstra
2009-04-28 7:58 ` Balbir Singh
2009-04-28 7:58 ` Balbir Singh
2009-04-28 8:11 ` Peter Zijlstra
2009-04-28 8:11 ` Peter Zijlstra
2009-04-28 8:23 ` KAMEZAWA Hiroyuki
2009-04-28 8:23 ` KAMEZAWA Hiroyuki
2009-04-28 8:25 ` Balbir Singh
2009-04-28 8:25 ` Balbir Singh
2009-04-28 8:03 ` KOSAKI Motohiro
2009-04-28 8:03 ` KOSAKI Motohiro
2009-04-28 9:09 ` Wu Fengguang
2009-04-28 9:09 ` Wu Fengguang
2009-04-28 9:26 ` Wu Fengguang
2009-04-28 9:26 ` Wu Fengguang
2009-04-28 12:08 ` Theodore Tso
2009-04-28 12:08 ` Theodore Tso
2009-04-29 5:51 ` KOSAKI Motohiro
2009-04-29 5:51 ` KOSAKI Motohiro
2009-04-29 6:34 ` Andrew Morton
2009-04-29 6:34 ` Andrew Morton
2009-04-29 7:47 ` KOSAKI Motohiro
2009-04-29 7:47 ` KOSAKI Motohiro
2009-04-30 4:14 ` Elladan
2009-04-30 4:14 ` Elladan
2009-04-30 4:43 ` Andrew Morton
2009-04-30 4:43 ` Andrew Morton
2009-04-30 4:55 ` KOSAKI Motohiro
2009-04-30 4:55 ` KOSAKI Motohiro
2009-04-30 4:55 ` Elladan
2009-04-30 4:55 ` Elladan
2009-04-29 7:48 ` KOSAKI Motohiro
2009-04-29 7:48 ` KOSAKI Motohiro
2009-04-30 11:59 ` KOSAKI Motohiro
2009-04-30 11:59 ` KOSAKI Motohiro
2009-04-30 13:46 ` Elladan
2009-04-30 13:46 ` Elladan
2009-05-06 11:04 ` KOSAKI Motohiro
2009-05-06 11:04 ` KOSAKI Motohiro
2009-04-28 15:28 ` Rik van Riel
2009-04-28 23:29 ` [PATCH] vmscan: evict use-once pages first Rik van Riel
2009-04-28 23:29 ` Rik van Riel
2009-04-29 3:36 ` Elladan
2009-04-29 3:36 ` Elladan
2009-04-29 17:06 ` Christoph Hellwig
2009-04-29 17:06 ` Christoph Hellwig
2009-04-29 6:42 ` Peter Zijlstra
2009-04-29 6:42 ` Peter Zijlstra
2009-04-29 13:30 ` Rik van Riel
2009-04-29 13:30 ` Rik van Riel
2009-04-29 15:47 ` [PATCH] vmscan: evict use-once pages first (v2) Rik van Riel
2009-04-29 15:47 ` Rik van Riel
2009-04-29 16:07 ` KOSAKI Motohiro
2009-04-29 16:07 ` KOSAKI Motohiro
2009-04-29 16:18 ` Rik van Riel
2009-04-29 16:18 ` Rik van Riel
2009-04-29 17:14 ` [PATCH] vmscan: evict use-once pages first (v3) Rik van Riel
2009-04-29 17:14 ` Rik van Riel
2009-04-30 0:39 ` KOSAKI Motohiro
2009-04-30 0:39 ` KOSAKI Motohiro
2009-04-30 8:10 ` Johannes Weiner
2009-04-30 8:10 ` Johannes Weiner
2009-05-01 22:32 ` Andrew Morton
2009-05-01 22:32 ` Andrew Morton
2009-05-01 23:05 ` Rik van Riel
2009-05-01 23:05 ` Rik van Riel
2009-05-01 23:25 ` Andrew Morton
2009-05-01 23:25 ` Andrew Morton
2009-05-03 1:28 ` Wu Fengguang
2009-05-03 1:28 ` Wu Fengguang
2009-05-03 1:15 ` Wu Fengguang
2009-05-03 1:15 ` Wu Fengguang
2009-05-03 1:33 ` Rik van Riel
2009-05-03 1:33 ` Rik van Riel
2009-05-03 1:46 ` Wu Fengguang
2009-05-03 1:46 ` Wu Fengguang
2009-04-29 16:10 ` [PATCH] vmscan: evict use-once pages first (v2) Peter Zijlstra
2009-04-29 16:10 ` Peter Zijlstra
2009-04-30 7:20 ` Elladan
2009-04-30 7:20 ` Elladan
2009-04-30 13:08 ` Rik van Riel
2009-04-30 13:08 ` Rik van Riel
2009-04-30 14:00 ` Elladan
2009-04-30 14:00 ` Elladan
2009-05-01 0:45 ` Andrew Morton
2009-05-01 0:45 ` Andrew Morton
2009-05-01 0:59 ` Rik van Riel
2009-05-01 0:59 ` Rik van Riel
2009-05-01 1:13 ` Andrew Morton
2009-05-01 1:13 ` Andrew Morton
2009-05-01 1:50 ` Rik van Riel
2009-05-01 1:50 ` Rik van Riel
2009-05-01 2:54 ` Andrew Morton
2009-05-01 2:54 ` Andrew Morton
2009-05-01 14:05 ` Rik van Riel
2009-05-01 14:05 ` Rik van Riel
2009-05-01 18:04 ` Ray Lee
2009-05-01 18:04 ` Ray Lee
2009-05-01 19:34 ` Rik van Riel
2009-05-01 19:34 ` Rik van Riel
2009-05-01 19:44 ` Ray Lee
2009-05-01 19:44 ` Ray Lee
2009-05-01 20:08 ` Rik van Riel
2009-05-01 20:08 ` Rik van Riel
2009-05-01 20:17 ` Elladan
2009-05-01 20:17 ` Elladan
2009-05-01 19:35 ` Andrew Morton
2009-05-01 19:35 ` Andrew Morton
2009-05-01 20:05 ` Rik van Riel
2009-05-01 20:05 ` Rik van Riel
2009-05-01 20:45 ` Andrew Morton
2009-05-01 20:45 ` Andrew Morton
2009-05-01 21:46 ` Rik van Riel
2009-05-01 21:46 ` Rik van Riel
2009-05-03 3:15 ` Wu Fengguang
2009-05-03 3:15 ` Wu Fengguang
2009-05-03 3:24 ` Rik van Riel
2009-05-03 3:24 ` Rik van Riel
2009-05-03 3:43 ` Wu Fengguang
2009-05-03 3:43 ` Wu Fengguang
2009-05-04 10:23 ` Peter Zijlstra
2009-05-04 10:23 ` Peter Zijlstra
2009-05-07 12:11 ` [PATCH -mm] vmscan: make mapped executable pages the first class citizen Wu Fengguang
2009-05-07 12:11 ` Wu Fengguang
2009-05-07 13:39 ` Christoph Lameter
2009-05-07 13:39 ` Christoph Lameter
2009-05-07 14:15 ` Peter Zijlstra
2009-05-07 14:15 ` Peter Zijlstra
2009-05-07 14:18 ` Christoph Lameter
2009-05-07 14:18 ` Christoph Lameter
2009-05-07 14:38 ` Peter Zijlstra
2009-05-07 14:38 ` Peter Zijlstra
2009-05-07 15:36 ` Christoph Lameter
2009-05-07 15:36 ` Christoph Lameter
2009-05-07 15:59 ` Rik van Riel
2009-05-07 15:59 ` Rik van Riel
2009-05-07 15:06 ` Rik van Riel
2009-05-07 15:06 ` Rik van Riel
2009-05-07 16:00 ` Lee Schermerhorn
2009-05-07 16:00 ` Lee Schermerhorn
2009-05-07 16:32 ` Christoph Lameter
2009-05-07 16:32 ` Christoph Lameter
2009-05-07 17:11 ` Rik van Riel
2009-05-07 17:11 ` Rik van Riel
2009-05-08 3:40 ` Elladan
2009-05-08 3:40 ` Elladan
2009-05-08 16:04 ` Rik van Riel
2009-05-08 16:04 ` Rik van Riel
2009-05-09 4:04 ` Elladan
2009-05-09 4:04 ` Elladan
2009-05-08 17:18 ` Christoph Lameter
2009-05-08 17:18 ` Christoph Lameter
2009-05-09 10:20 ` KOSAKI Motohiro
2009-05-09 10:20 ` KOSAKI Motohiro
2009-05-08 17:37 ` Alan Cox
2009-05-08 17:37 ` Alan Cox
2009-05-07 15:10 ` Johannes Weiner
2009-05-07 15:10 ` Johannes Weiner
2009-05-07 15:17 ` Peter Zijlstra
2009-05-07 15:17 ` Peter Zijlstra
2009-05-07 15:21 ` Rik van Riel
2009-05-07 15:21 ` Rik van Riel
2009-05-08 3:30 ` Wu Fengguang
2009-05-08 3:30 ` Wu Fengguang
2009-05-08 4:17 ` [RFC][PATCH] vmscan: report vm_flags in page_referenced() Wu Fengguang
2009-05-08 4:17 ` Wu Fengguang
2009-05-08 12:09 ` Minchan Kim
2009-05-08 12:09 ` Minchan Kim
2009-05-08 12:15 ` Wu Fengguang
2009-05-08 12:15 ` Wu Fengguang
2009-05-08 14:01 ` Minchan Kim
2009-05-08 14:01 ` Minchan Kim
2009-05-09 6:56 ` Wu Fengguang
2009-05-09 6:56 ` Wu Fengguang
2009-05-10 23:45 ` Minchan Kim
2009-05-10 23:45 ` Minchan Kim
2009-05-17 11:25 ` Wu Fengguang
2009-05-17 11:25 ` Wu Fengguang
2009-05-07 20:44 ` [PATCH -mm] vmscan: make mapped executable pages the first class citizen Andrew Morton
2009-05-07 20:44 ` Andrew Morton
2009-05-08 8:16 ` Wu Fengguang
2009-05-08 8:16 ` Wu Fengguang
2009-05-08 8:28 ` Wu Fengguang
2009-05-08 8:28 ` Wu Fengguang
2009-05-08 19:58 ` Andrew Morton
2009-05-08 19:58 ` Andrew Morton
2009-05-08 22:00 ` Alan Cox
2009-05-08 22:00 ` Alan Cox
2009-05-08 22:15 ` Andrew Morton
2009-05-08 22:15 ` Andrew Morton
2009-05-08 22:53 ` Elladan
2009-05-08 22:53 ` Elladan
2009-05-08 22:20 ` Rik van Riel
2009-05-08 22:20 ` Rik van Riel
2009-05-10 8:59 ` KOSAKI Motohiro
2009-05-10 8:59 ` KOSAKI Motohiro
2009-05-10 9:07 ` Peter Zijlstra
2009-05-10 9:07 ` Peter Zijlstra
2009-05-10 9:35 ` Wu Fengguang
2009-05-10 9:35 ` Wu Fengguang
2009-05-10 10:06 ` KOSAKI Motohiro
2009-05-10 10:06 ` KOSAKI Motohiro
2009-05-10 9:36 ` KOSAKI Motohiro
2009-05-10 9:36 ` KOSAKI Motohiro
2009-05-10 13:45 ` Alan Cox [this message]
2009-05-10 13:45 ` Alan Cox
2009-05-10 13:56 ` KOSAKI Motohiro
2009-05-10 13:56 ` KOSAKI Motohiro
2009-05-10 14:51 ` Rik van Riel
2009-05-10 14:51 ` Rik van Riel
2009-05-10 14:59 ` KOSAKI Motohiro
2009-05-10 14:59 ` KOSAKI Motohiro
2009-05-10 20:13 ` Alan Cox
2009-05-10 20:13 ` Alan Cox
2009-05-10 20:37 ` Rik van Riel
2009-05-10 20:37 ` Rik van Riel
2009-05-10 21:23 ` Arjan van de Ven
2009-05-10 21:23 ` Arjan van de Ven
2009-05-11 10:03 ` Johannes Weiner
2009-05-11 10:03 ` Johannes Weiner
2009-05-10 21:29 ` Alan Cox
2009-05-10 21:29 ` Alan Cox
2009-05-10 9:20 ` Wu Fengguang
2009-05-10 9:20 ` Wu Fengguang
2009-05-10 9:29 ` KOSAKI Motohiro
2009-05-10 9:29 ` KOSAKI Motohiro
2009-05-10 10:03 ` Wu Fengguang
2009-05-10 10:03 ` Wu Fengguang
2009-05-10 10:15 ` KOSAKI Motohiro
2009-05-10 10:15 ` KOSAKI Motohiro
2009-05-10 11:21 ` Wu Fengguang
2009-05-10 11:21 ` Wu Fengguang
2009-05-10 11:39 ` KOSAKI Motohiro
2009-05-10 11:39 ` KOSAKI Motohiro
2009-05-10 11:44 ` Wu Fengguang
2009-05-10 11:44 ` Wu Fengguang
2009-05-10 12:19 ` Peter Zijlstra
2009-05-10 12:19 ` Peter Zijlstra
2009-05-10 12:39 ` KOSAKI Motohiro
2009-05-10 12:39 ` KOSAKI Motohiro
2009-05-10 13:17 ` Peter Zijlstra
2009-05-10 13:17 ` Peter Zijlstra
2009-05-12 2:50 ` Wu Fengguang
2009-05-12 2:50 ` Wu Fengguang
2009-05-12 4:35 ` Wu Fengguang
2009-05-12 4:35 ` Wu Fengguang
2009-05-12 13:20 ` Rik van Riel
2009-05-12 13:20 ` Rik van Riel
2009-05-16 9:26 ` Wu Fengguang
2009-05-16 9:26 ` Wu Fengguang
2009-05-12 2:51 ` [PATCH -mm] vmscan: report vm_flags in page_referenced() Wu Fengguang
2009-05-12 2:51 ` Wu Fengguang
2009-05-12 6:23 ` Peter Zijlstra
2009-05-12 6:23 ` Peter Zijlstra
2009-05-12 6:44 ` Minchan Kim
2009-05-12 6:44 ` Minchan Kim
2009-05-12 11:44 ` Wu Fengguang
2009-05-12 11:44 ` Wu Fengguang
2009-05-12 2:52 ` [PATCH -mm] vmscan: make mapped executable pages the first class citizen Wu Fengguang
2009-05-12 2:52 ` Wu Fengguang
2009-05-12 3:00 ` KOSAKI Motohiro
2009-05-12 3:00 ` KOSAKI Motohiro
2009-05-12 20:54 ` [PATCH -mm] vmscan: protect a fraction of file backed mapped pages from reclaim Christoph Lameter
2009-05-12 20:54 ` Christoph Lameter
2009-05-12 17:06 ` Rik van Riel
2009-05-12 17:06 ` Rik van Riel
2009-05-12 21:20 ` Christoph Lameter
2009-05-12 21:20 ` Christoph Lameter
2009-05-12 17:39 ` Rik van Riel
2009-05-12 17:39 ` Rik van Riel
2009-05-12 22:02 ` Christoph Lameter
2009-05-12 22:02 ` Christoph Lameter
2009-05-12 20:17 ` Rik van Riel
2009-05-12 20:17 ` Rik van Riel
2009-05-12 20:26 ` Christoph Lameter
2009-05-12 20:26 ` Christoph Lameter
2009-05-13 0:45 ` KOSAKI Motohiro
2009-05-13 0:45 ` KOSAKI Motohiro
2009-05-14 20:14 ` Christoph Lameter
2009-05-14 20:14 ` Christoph Lameter
2009-05-14 23:28 ` KOSAKI Motohiro
2009-05-14 23:28 ` KOSAKI Motohiro
2009-05-14 23:42 ` Rik van Riel
2009-05-14 23:42 ` Rik van Riel
2009-05-15 18:09 ` Christoph Lameter
2009-05-15 18:09 ` Christoph Lameter
2009-05-16 8:54 ` Wu Fengguang
2009-05-16 8:54 ` Wu Fengguang
2009-05-12 8:17 ` [PATCH -mm] vmscan: make mapped executable pages the first class citizen Minchan Kim
2009-05-12 8:17 ` Minchan Kim
2009-05-12 2:53 ` [PATCH -mm] vmscan: merge duplicate code in shrink_active_list() Wu Fengguang
2009-05-12 2:53 ` Wu Fengguang
2009-05-12 2:58 ` KOSAKI Motohiro
2009-05-12 2:58 ` KOSAKI Motohiro
2009-05-12 3:03 ` Wu Fengguang
2009-05-12 3:03 ` Wu Fengguang
2009-05-12 7:26 ` Minchan Kim
2009-05-12 7:26 ` Minchan Kim
2009-05-12 11:48 ` Wu Fengguang
2009-05-12 11:48 ` Wu Fengguang
2009-05-12 11:57 ` Minchan Kim
2009-05-12 11:57 ` Minchan Kim
2009-05-12 13:32 ` Rik van Riel
2009-05-12 13:32 ` Rik van Riel
2009-05-16 9:30 ` Wu Fengguang
2009-05-16 9:30 ` Wu Fengguang
2009-05-08 3:02 ` [PATCH -mm] vmscan: make mapped executable pages the first class citizen Wu Fengguang
2009-05-08 3:02 ` Wu Fengguang
2009-05-08 7:30 ` Minchan Kim
2009-05-08 7:30 ` Minchan Kim
2009-05-08 8:09 ` Wu Fengguang
2009-05-08 8:09 ` Wu Fengguang
2009-05-08 9:34 ` Minchan Kim
2009-05-08 9:34 ` Minchan Kim
2009-05-08 14:25 ` Christoph Lameter
2009-05-08 14:25 ` Christoph Lameter
2009-05-08 14:34 ` Rik van Riel
2009-05-08 14:34 ` Rik van Riel
2009-05-08 17:41 ` KOSAKI Motohiro
2009-05-08 17:41 ` KOSAKI Motohiro
2009-05-04 8:04 ` [PATCH] vmscan: evict use-once pages first (v2) Peter Zijlstra
2009-05-04 8:04 ` Peter Zijlstra
2009-05-01 3:09 ` Elladan
2009-05-01 3:09 ` Elladan
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