linux-kernel - Re: [PATCH 15/32] nohz/cpuset: Restart tick when switching to idle task

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: <1314632620.2816.100.camel@twins>
Date:	Mon, 29 Aug 2011 17:43:40 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [PATCH 15/32] nohz/cpuset: Restart tick when switching to idle
 task

On Mon, 2011-08-15 at 17:52 +0200, Frederic Weisbecker wrote:
> Ideally if we are in adaptive nohz mode and we switch to the
> the idle task, we shouldn't restart the tick since it's going
> to stop the tick soon anyway.
> 
> That optimization requires some minor tweaks here and there
> though, lets handle that later. 

You have a knack for confusing changelogs.. so basically you say:

  Restart the tick when we switch to idle.

Now all that needs is an explanation of why..

Also, please drop the whole cpuset_nohz_ stuff, this really isn't about
cpusets, cpusets simly provide the interface, the functionality lives in
the tick_nohz_ namespace.
--
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/