linux-kernel - Re: [PATCH 3/3] vmevent: Implement special low-memory attribute

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.2.00.1206050939140.26918@router.home>
Date:	Tue, 5 Jun 2012 09:40:28 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Minchan Kim <minchan@...nel.org>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com
Subject: Re: [PATCH 3/3] vmevent: Implement special low-memory attribute

On Tue, 8 May 2012, KOSAKI Motohiro wrote:

> 4) Currently, vmstat have per-cpu batch and vmstat updating makes 3
> second delay at maximum.

Nope. The delay is one second only and it is limited to a certain amount
per cpu. There is a bound on the inaccuracy of the counter. If you want to
have them more accurate then the right approach is to limit the
threshhold. The more accurate the higher the impact of cache line
bouncing.

--
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/