linux-kernel - Re: [PATCH 5/5] add shmem vmstat

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.1.10.0907091643240.17835@gentwo.org>
Date:	Thu, 9 Jul 2009 16:46:36 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: [PATCH 5/5] add shmem vmstat

On Thu, 9 Jul 2009, KOSAKI Motohiro wrote:

> Recently, We faced several OOM problem by plenty GEM cache. and generally,
> plenty Shmem/Tmpfs potentially makes memory shortage problem.

"
Recently we encountered OOM problems due to memory use of the GEM cache.
Generally a large amuont of Shmem/Tmpfs pages tend to create a memory
shortage problem.
"

> We often use following calculation to know shmem pages,
>   shmem = NR_ACTIVE_ANON + NR_INACTIVE_ANON - NR_ANON_PAGES
> but it is wrong expression. it doesn't consider isolated page and
> mlocked page.

"
We often use the following calculation to determine the amount of shmem
pages:

shmem = NR_ACTIVE_ANON + NR_INACTIVE_ANON - NR_ANON_PAGES

however the expression does not consider isoalted and mlocked pages.
"

> Then, This patch make explicit Shmem/Tmpfs vm-stat accounting.

"
This patch adds explicit accounting for pages used by shmem and tmpfs.
"

Reviewed-by: Christoph Lameter <cl@...ux-foundation.org>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/