linux-kernel - Re: Sending some form of notifaction when sched

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Message-ID: <1293532210.2899.1002.camel@Palantir>
Date:	Tue, 28 Dec 2010 11:30:10 +0100
From:	Dario Faggioli <raistlin@...ux.it>
To:	Bharata B Rao <bharata.rao@...il.com>
Cc:	torbenh <torbenh@....de>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <ghaskins@...ell.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dhaval Giani <dhaval.giani@...il.com>
Subject: Re: Sending some form of notifaction when sched_fifo throttling
 kicks in...

On Mon, 2010-12-27 at 12:13 +0530, Bharata B Rao wrote: 
> > Do others have some idea and/or comments about that? This is
> > ABI/interface, and that really scares me! :-P
> 
> You might want to note that CFS bandwidth control patches export some
> such stats via a new per-cgroup file cpu.stat. It exports 3 statistics:
> 
Yeah, I saw that. What can be also done is to extend schedstats and then
apply it to cgroups as well... I think Dhaval told me he has some plans
about that, am I wrong?

> nr_periods: Number of enforcement intervals that have elapsed.
> nr_throttled: Number of times the group has been throttled/limited.
> throttled_time: The total time duration (in nanoseconds) for which the group
> remained throttled.
> 
More than reasonable reporting, to me at least. :-)

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://retis.sssup.it/people/faggioli -- dario.faggioli@...ber.org

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