From: Christoph Lameter <cl@linux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"hugh.dickins@tiscali.co.uk" <hugh.dickins@tiscali.co.uk>,
akpm@linux-foundation.org,
"kosaki.motohiro@jp.fujitsu.com" <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [RFC][PATCH] lib: generic percpu counter array
Date: Thu, 5 Nov 2009 10:20:18 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.1.10.0911051017310.25718@V090114053VZO-1> (raw)
In-Reply-To: <20091105141653.132d4977.kamezawa.hiroyu@jp.fujitsu.com>
On Thu, 5 Nov 2009, KAMEZAWA Hiroyuki wrote:
> Anothter major percpu coutner is vm_stat[]. This patch implements
> vm_stat[] style counter array in lib/percpu_counter.c
> This is designed for introducing vm_stat[] style counter to memcg,
> but maybe useful for other people. By using this, counter array
> using percpu can be implemented easily in compact structure.
Note that vm_stat support was written that way because we have extreme
space constraints due to the need to keep statistics per zone and per cpu
and avoid cache line pressure that would result through the use of big
integer arrays per zone and per cpu. For a large number of zones and cpus
this is desastrous.
If you only need to keep statistics per cpu for an entity then the vmstat
approach is overkill. A per cpu allocation of a counter is enough.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2009-11-05 18:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-04 6:24 [PATCH] show per-process swap usage via procfs KAMEZAWA Hiroyuki
2009-11-04 19:15 ` Christoph Lameter
2009-11-04 23:25 ` KOSAKI Motohiro
2009-11-05 2:28 ` KAMEZAWA Hiroyuki
2009-11-05 15:04 ` Christoph Lameter
2009-11-08 17:04 ` Pavel Machek
2009-11-05 0:06 ` KAMEZAWA Hiroyuki
2009-11-05 5:16 ` [RFC][PATCH] lib: generic percpu counter array KAMEZAWA Hiroyuki
2009-11-05 15:15 ` Christoph Lameter
2009-11-06 0:49 ` KAMEZAWA Hiroyuki
2009-11-05 15:20 ` Christoph Lameter [this message]
2009-11-06 0:56 ` KAMEZAWA Hiroyuki
2009-11-05 14:41 ` [PATCH] show per-process swap usage via procfs KOSAKI Motohiro
2009-11-05 15:11 ` Minchan Kim
2009-11-05 23:48 ` KAMEZAWA Hiroyuki
2009-11-06 4:40 ` [PATCH] show per-process swap usage via procfs v2 KAMEZAWA Hiroyuki
2009-11-06 15:19 ` Minchan Kim
2009-11-11 2:25 ` [PATCH] show per-process swap usage via procfs v3 KAMEZAWA Hiroyuki
2009-11-12 15:20 ` Christoph Lameter
2009-11-13 1:51 ` KAMEZAWA Hiroyuki
2009-11-13 2:35 ` KAMEZAWA Hiroyuki
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.1.10.0911051017310.25718@V090114053VZO-1 \
--to=cl@linux-foundation.org \
--cc=akpm@linux-foundation.org \
--cc=hugh.dickins@tiscali.co.uk \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox