linux-kernel - Re: [PATCH 0/2] SCHED

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Message-ID: <54917BCC.9070001@arm.com>
Date:	Wed, 17 Dec 2014 12:49:16 +0000
From:	Juri Lelli <juri.lelli@....com>
To:	Luca Abeni <luca.abeni@...tn.it>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...il.com>,
	Dario Faggioli <raistlin@...ux.it>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] SCHED_DEADLINE fixes

Hi Luca,

On 17/12/14 10:50, Luca Abeni wrote:
> Hi all,
> 
> I noticed some discrepancies between the schedule produced
> by SCHED_DEADLINE and the expectations from real-time
> scheduling theory. After some investigations, it turned out
> that such discrepancies are due to two bugs in deadline.c,
> which are particularly visible when using global scheduling
> on multiple CPUs (see the two patches for more details).
> 
> I think the first bug (fixed in patch 0001) is particularly
> critical, because it causes a violation of the SCHED_DEADLINE
> guarantee (if the total load is smaller than the number of
> CPUs, there is an upper bound for the response times. This is
> a well known property for global EDF, but is not respected by
> SCHED_DEADLINE - see patch 0001 for more details).
> The second patch is IMHO also important, but less critical.
> 

I already reviewed and tested them. They looks ok and are important
fixes. ACK for both. :)

Thanks a lot!

- Juri

> Luca Abeni (2):
>   Fix migration of SCHED_DEADLINE tasks
>   Avoid double-accounting in case of missed deadlines
> 
>  kernel/sched/deadline.c | 25 ++++---------------------
>  1 file changed, 4 insertions(+), 21 deletions(-)
> 

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