From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Wu Fengguang <fengguang.wu@intel.com>,
hannes@cmpxchg.org, 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 22:29:38 +0100 [thread overview]
Message-ID: <20090510222938.4d8e0dc3@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <4A073B0D.4090604@redhat.com>
> Our big problem today usually isn't throughput though,
> but latency - the time it takes to bring a previously
> inactive application back to life.
But if you page back in in 2MB chunks that is faster too. The initial "oh
dear we guessed wrong and he's clicked on OpenOffice again" we can't
really speed up (barring not paging out those bits and a little bit of
potential gain from not ramming stuff down the disks throat at full pelt)
but the amount of time it takes after that first "run for the disk"
moment is a lot shorter.
One question I have no idea as to the answer or any research on is "if I
take a 2MB chunk of an apps pages and toss them out together is there
sufficient statistical correlation that makes it useful to pull them back
in together"
Clearly working in 512K/2MB chunks reduces the efficiency that we get
from memory (which we have lots of) as well as improving our I/O
efficiency dramatically (which we are very short of), the question is
which dominates under load.
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next prev parent reply other threads:[~2009-05-10 21:28 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
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 [this message]
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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