linux-kernel - Re: [PATCH 07/14] sched: add schedstats for -deadline tasks.

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Date:	Tue, 15 Oct 2013 11:06:20 +0200
From:	Juri Lelli <juri.lelli@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	tglx@...utronix.de, mingo@...hat.com, rostedt@...dmis.org,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com--no-chain-reply-to
Subject: Re: [PATCH 07/14] sched: add schedstats for -deadline tasks.

On 10/14/2013 02:08 PM, Peter Zijlstra wrote:
> On Mon, Oct 14, 2013 at 12:43:39PM +0200, Juri Lelli wrote:
>> From: Dario Faggioli <raistlin@...ux.it>
>>
>> Add some typical sched-debug output to dl_rq(s) and some
>> schedstats to -deadline tasks.
> 
> Could you perhaps add a bit to the changelog explaining what kind of
> problems this patch helped (or could help) to find?
> 

Expanded in this:

Add some typical sched-debug output to dl_rq(s) and some
schedstats to -deadline tasks. This helps spotting problems
with queue and dequeue operations (incorrect ordering) and
gives hints about system status (one can have an idea if the
system is overloaded, if tasks are missing their deadlines
and the entity of such anomalies).

Thanks,

- Juri
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