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Subject: Re: Sending some form of notifaction when sched_fifo throttling
 kicks in...
From: Dario Faggioli <raistlin@linux.it>
To: Bharata B Rao <bharata.rao@gmail.com>
Cc: torbenh <torbenh@gmx.de>, linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        Gregory Haskins <ghaskins@novell.com>,
        Nick Piggin <nickpiggin@yahoo.com.au>,
        Dhaval Giani <dhaval.giani@gmail.com>
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References: <20101223113926.GH14960@siel.b>
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On Mon, 2010-12-27 at 12:13 +0530, Bharata B Rao wrote:=20
> > Do others have some idea and/or comments about that? This is
> > ABI/interface, and that really scares me! :-P
>=20
> 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:
>=20
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 gr=
oup
> remained throttled.
>=20
More than reasonable reporting, to me at least. :-)

Regards,
Dario

--=20
<<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@jabber.org

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