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

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Date:	Thu, 23 Dec 2010 15:44:56 +0100
From:	Dario Faggioli <raistlin@...ux.it>
To:	Dhaval Giani <dhaval.giani@...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>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, vatsa@...ibm.com
Subject: Re: Sending some form of notifaction when sched_fifo throttling
 kicks in...

On Thu, 2010-12-23 at 15:04 +0100, Dhaval Giani wrote: 
> > ... If you think you're fine with some /proc (and perhaps cpuacct, if
> > cgroups are being used) readable, I can try to come up with something.
> >
> 
> There is no point in putting it in cpuacct since cpuacct can be used
> separately from cpu.
> 
Which would mean that you'd need both for having such stat. Anyway, I'm
fine with putting this in 'cpu' as well, just trying to find a consensus
on what the right place is.

> > Do others have some idea and/or comments about that? This is
> > ABI/interface, and that really scares me! :-P
> 
> IIRC, your patchset had something like this for getting the
> statistics? Starting fromt hre, would schedstats be the right place?
> 
SCHED_DEADLINE patchset has both signaling capabilities and some
statistic reporting, bat it's a different thing.

I think schedstat could be the right place for _this_ thing here, but
since each cgroup could be throttled, we also need something which is
per-cgroup... Don't you agree?

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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