From: Rik van Riel <riel@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Wu Fengguang <fengguang.wu@intel.com>,
hannes@cmpxchg.org, peterz@infradead.org,
linux-kernel@vger.kernel.org, tytso@mit.edu, linux-mm@kvack.org,
elladan@eskimo.com, npiggin@suse.de, cl@linux-foundation.org,
kosaki.motohiro@jp.fujitsu.com, minchan.kim@gmail.com
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen
Date: Fri, 08 May 2009 18:20:17 -0400 [thread overview]
Message-ID: <4A04B021.10004@redhat.com> (raw)
In-Reply-To: <20090508230045.5346bd32@lxorguk.ukuu.org.uk>
Alan Cox wrote:
>> The patch seems reasonable but the changelog and the (non-existent)
>> design documentation could do with a touch-up.
>
> Is it right that I as a user can do things like mmap my database
> PROT_EXEC to get better database numbers by making other
> stuff swap first ?
Yes, but only if your SELinux policy allows you to
mmap something that's both executable and writable
at the same time.
> You seem to be giving everyone a "nice my process up" hack.
A user who wants to slow the system down has always
been able to do so.
I am not convinced that the potential disadvantages
of giving mapped referenced executable file pages an
extra round trip on the active file list outweighs
the advantages of doing so for normal workloads.
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next prev parent reply other threads:[~2009-05-08 22:20 UTC|newest]
Thread overview: 168+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090428044426.GA5035@eskimo.com>
2009-04-28 5:35 ` Swappiness vs. mmap() and interactive response KOSAKI Motohiro
2009-04-28 6:36 ` Elladan
2009-04-28 6:52 ` KOSAKI Motohiro
2009-04-28 7:26 ` Elladan
2009-04-28 7:44 ` KOSAKI Motohiro
2009-04-28 7:48 ` Peter Zijlstra
2009-04-28 7:58 ` Balbir Singh
2009-04-28 8:11 ` Peter Zijlstra
2009-04-28 8:23 ` KAMEZAWA Hiroyuki
2009-04-28 8:25 ` Balbir Singh
2009-04-28 8:03 ` KOSAKI Motohiro
2009-04-28 9:09 ` Wu Fengguang
2009-04-28 9:26 ` Wu Fengguang
2009-04-28 12:08 ` Theodore Tso
2009-04-29 5:51 ` KOSAKI Motohiro
2009-04-29 6:34 ` Andrew Morton
2009-04-29 7:47 ` KOSAKI Motohiro
2009-04-30 4:14 ` Elladan
2009-04-30 4:43 ` Andrew Morton
2009-04-30 4:55 ` KOSAKI Motohiro
2009-04-30 4:55 ` Elladan
2009-04-29 7:48 ` KOSAKI Motohiro
2009-04-30 11:59 ` KOSAKI Motohiro
2009-04-30 13:46 ` Elladan
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
2009-04-29 3:36 ` Elladan
2009-04-29 17:06 ` Christoph Hellwig
2009-04-29 6:42 ` Peter Zijlstra
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 16:07 ` KOSAKI Motohiro
2009-04-29 16:18 ` Rik van Riel
2009-04-29 17:14 ` [PATCH] vmscan: evict use-once pages first (v3) Rik van Riel
2009-04-30 0:39 ` KOSAKI Motohiro
2009-04-30 8:10 ` Johannes Weiner
2009-05-01 22:32 ` Andrew Morton
2009-05-01 23:05 ` Rik van Riel
2009-05-01 23:25 ` Andrew Morton
2009-05-03 1:28 ` Wu Fengguang
2009-05-03 1:15 ` Wu Fengguang
2009-05-03 1:33 ` Rik van Riel
2009-05-03 1:46 ` Wu Fengguang
2009-04-29 16:10 ` [PATCH] vmscan: evict use-once pages first (v2) Peter Zijlstra
2009-04-30 7:20 ` Elladan
2009-04-30 13:08 ` Rik van Riel
2009-04-30 14:00 ` Elladan
2009-05-01 0:45 ` Andrew Morton
2009-05-01 0:59 ` Rik van Riel
2009-05-01 1:13 ` Andrew Morton
2009-05-01 1:50 ` Rik van Riel
2009-05-01 2:54 ` Andrew Morton
2009-05-01 14:05 ` Rik van Riel
2009-05-01 18:04 ` Ray Lee
2009-05-01 19:34 ` Rik van Riel
2009-05-01 19:44 ` Ray Lee
2009-05-01 20:08 ` Rik van Riel
2009-05-01 20:17 ` Elladan
2009-05-01 19:35 ` Andrew Morton
2009-05-01 20:05 ` Rik van Riel
2009-05-01 20:45 ` Andrew Morton
2009-05-01 21:46 ` Rik van Riel
2009-05-03 3:15 ` Wu Fengguang
2009-05-03 3:24 ` Rik van Riel
2009-05-03 3:43 ` Wu Fengguang
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 13:39 ` Christoph Lameter
2009-05-07 14:15 ` Peter Zijlstra
2009-05-07 14:18 ` Christoph Lameter
2009-05-07 14:38 ` Peter Zijlstra
2009-05-07 15:36 ` Christoph Lameter
2009-05-07 15:59 ` Rik van Riel
2009-05-07 15:06 ` Rik van Riel
2009-05-07 16:00 ` Lee Schermerhorn
2009-05-07 16:32 ` Christoph Lameter
2009-05-07 17:11 ` Rik van Riel
2009-05-08 3:40 ` Elladan
2009-05-08 16:04 ` Rik van Riel
2009-05-09 4:04 ` Elladan
2009-05-08 17:18 ` Christoph Lameter
2009-05-09 10:20 ` KOSAKI Motohiro
2009-05-08 17:37 ` Alan Cox
2009-05-07 15:10 ` Johannes Weiner
2009-05-07 15:17 ` Peter Zijlstra
2009-05-07 15:21 ` Rik van Riel
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 12:09 ` Minchan Kim
2009-05-08 12:15 ` Wu Fengguang
2009-05-08 14:01 ` Minchan Kim
2009-05-09 6:56 ` Wu Fengguang
2009-05-10 23:45 ` Minchan Kim
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
2009-05-08 8:16 ` Wu Fengguang
2009-05-08 8:28 ` Wu Fengguang
2009-05-08 19:58 ` Andrew Morton
2009-05-08 22:00 ` Alan Cox
2009-05-08 22:15 ` Andrew Morton
2009-05-08 22:53 ` Elladan
2009-05-08 22:20 ` Rik van Riel [this message]
2009-05-10 8:59 ` KOSAKI Motohiro
2009-05-10 9:07 ` Peter Zijlstra
2009-05-10 9:35 ` Wu Fengguang
2009-05-10 10:06 ` KOSAKI Motohiro
2009-05-10 9:36 ` KOSAKI Motohiro
2009-05-10 13:45 ` Alan Cox
2009-05-10 13:56 ` KOSAKI Motohiro
2009-05-10 14:51 ` Rik van Riel
2009-05-10 14:59 ` KOSAKI Motohiro
2009-05-10 20:13 ` Alan Cox
2009-05-10 20:37 ` Rik van Riel
2009-05-10 21:23 ` Arjan van de Ven
2009-05-11 10:03 ` Johannes Weiner
2009-05-10 21:29 ` Alan Cox
2009-05-10 9:20 ` Wu Fengguang
2009-05-10 9:29 ` KOSAKI Motohiro
2009-05-10 10:03 ` Wu Fengguang
2009-05-10 10:15 ` KOSAKI Motohiro
2009-05-10 11:21 ` Wu Fengguang
2009-05-10 11:39 ` KOSAKI Motohiro
2009-05-10 11:44 ` Wu Fengguang
2009-05-10 12:19 ` Peter Zijlstra
2009-05-10 12:39 ` KOSAKI Motohiro
2009-05-10 13:17 ` Peter Zijlstra
2009-05-12 2:50 ` Wu Fengguang
2009-05-12 4:35 ` Wu Fengguang
2009-05-12 13:20 ` Rik van Riel
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 6:23 ` Peter Zijlstra
2009-05-12 6:44 ` Minchan Kim
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 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 17:06 ` Rik van Riel
2009-05-12 21:20 ` Christoph Lameter
2009-05-12 17:39 ` Rik van Riel
2009-05-12 22:02 ` Christoph Lameter
2009-05-12 20:17 ` Rik van Riel
2009-05-12 20:26 ` Christoph Lameter
2009-05-13 0:45 ` KOSAKI Motohiro
2009-05-14 20:14 ` Christoph Lameter
2009-05-14 23:28 ` KOSAKI Motohiro
2009-05-14 23:42 ` Rik van Riel
2009-05-15 18:09 ` Christoph Lameter
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 2:53 ` [PATCH -mm] vmscan: merge duplicate code in shrink_active_list() Wu Fengguang
2009-05-12 2:58 ` KOSAKI Motohiro
2009-05-12 3:03 ` Wu Fengguang
2009-05-12 7:26 ` Minchan Kim
2009-05-12 11:48 ` Wu Fengguang
2009-05-12 11:57 ` Minchan Kim
2009-05-12 13:32 ` Rik van Riel
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 7:30 ` Minchan Kim
2009-05-08 8:09 ` Wu Fengguang
2009-05-08 9:34 ` Minchan Kim
2009-05-08 14:25 ` Christoph Lameter
2009-05-08 14:34 ` Rik van Riel
2009-05-08 17:41 ` KOSAKI Motohiro
2009-05-04 8:04 ` [PATCH] vmscan: evict use-once pages first (v2) Peter Zijlstra
2009-05-01 3:09 ` Elladan
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