linux-kernel - Re: [RFC][PATCH 3/7] sched: Allow balance callbacks for check_class

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Message-ID: <20150603104534.GB3644@twins.programming.kicks-ass.net>
Date:	Wed, 3 Jun 2015 12:45:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	"umgwanakikbuti@...il.com" <umgwanakikbuti@...il.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ktkhai@...allels.com" <ktkhai@...allels.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"juri.lelli@...il.com" <juri.lelli@...il.com>,
	"pang.xunlei@...aro.org" <pang.xunlei@...aro.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"luca.abeni@...tn.it" <luca.abeni@...tn.it>
Subject: Re: [RFC][PATCH 3/7] sched: Allow balance callbacks for
 check_class_changed()

On Wed, Jun 03, 2015 at 01:42:41PM +0300, Kirill Tkhai wrote:
> [resend]
> 
> 03.06.2015, 10:32, "Peter Zijlstra" <peterz@...radead.org>:
> > On Tue, Jun 02, 2015 at 07:27:19PM +0300, Kirill Tkhai wrote:
> >>>  + * task_dead_dl() will cancel our timer if we happen to die while
> >>>  + * its still pending.
> >>  task_dead_dl() is called for tasks of deadline class only. So if we do that,
> >>  the timer may be executed after final task's dead.
> >
> > Indeed; sleep deprived brain misses the obvious :/
> 
> I have an idea, but it require small hrtimer modification. We may use
> task_struct counters {get,put}_task_struct(), when we're starting or cancelling
> the timer, and in timer handler. But it require to return back the commit:

Yeah, already working on that. :-)
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