linux-kernel - Re: [PATCH 07/41] cpuset: Set up interface for nohz flag

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: <1336577622.16079.39.camel@marge.simpson.net>
Date:	Wed, 09 May 2012 17:33:42 +0200
From:	Mike Galbraith <efault@....de>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linaro-sched-sig@...ts.linaro.org,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 07/41] cpuset: Set up interface for nohz flag

On Wed, 2012-05-09 at 10:05 -0500, Christoph Lameter wrote:

> I do not get how a cpuset could be used by an application with load
> balancing disabled. Seems to defeat the purpose of the cpuset (which IMHO
> is to generate a custom load balancing domain after all). You would
> have to manually pin the processes to processors of the cpuset anyways.
> 
> If you already have to pin then why would you want a cpuset on top of
> that?

You don't have to turn load balancing completely off.  I have at least
one customer with modest isolation requirements, an exclusive set with
load balancing enabled is perfect for them.  OTOH, for tight constraint
RT, I have no choice but to turn everything I can get my hands on off.
Any such app manages itself or is busted crud, so all is well, cpusets
work nicely.

I don't like cgroups much, but I've become rather fond of cpusets.

-Mike


--
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/