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: <1247864134.17553.30.camel@localhost.localdomain>
Date:	Fri, 17 Jul 2009 15:55:34 -0500
From:	Nathan Lynch <ntl@...ox.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rafael Wysocki <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Nigel Cunningham <nigel@...onice.net>, stable@...nel.org,
	containers@...ts.linux-foundation.org,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [patch 2/2] sched: fix nr_uninterruptible accounting of frozen
 tasks really

On Fri, 2009-07-17 at 18:47 +0200, Peter Zijlstra wrote:
> On Fri, 2009-07-17 at 08:22 -0700, Matt Helsley wrote:
> 
> > The job scheduler in question does not use FROZEN as a transient state and
> > does not use checkpoint/restart at all since c/r is still a work in progress.

Right, the job scheduler uses the cgroup freezer as a mechanism to
preempt a low priority job for a higher priority job.  (It had used
SIGSTOP in the past.)  So in this scenario a frozen cgroup may remain in
that state for a while.  Load average is consulted as a measure of
system utilization.

> > Even when used for power management it seems wrong to count frozen tasks
> > towards the loadavg since they aren't using CPU time or waiting for IO.
> 
> You're abusing it for _WHAT_?

I think Matt was referring to system-wide suspend/resume/hibernate, not
a behavior of the job scheduler, if that's your concern.


--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ