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From: Peter Zijlstra <peterz@infradead.org>
To: luca abeni <luca.abeni@unitn.it>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@arm.com>,
	Claudio Scordino <claudio@evidence.eu.com>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [RFC v3 2/6] Improve the tracking of active utilisation
Date: Fri, 18 Nov 2016 19:49:57 +0100	[thread overview]
Message-ID: <20161118184957.GV3117@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20161118170650.50932614@sweethome>

On Fri, Nov 18, 2016 at 05:06:50PM +0100, luca abeni wrote:
> 
> > Also, what happens when hrtimer_try_to_cancel() fails?
> 
> This is something I am working on... My original idea was that nothing
> bad happens, because the timer handler will see the task as RUNNING and
> will not decrease the running bw... But this is wrong.
> My new idea is to add a "dl_contending" flag in the scheduling entity,
> that indicates if the running bw has already been subtracted or not.
> With this, the issue should be solved (if anyone sees additional
> issues, or a better solution that does not require an additional flag,
> let me know).

Right. My suggestion would be to make it obvious, use that flag if
that's what it takes. We can always try and be clever later.

  reply	other threads:[~2016-11-18 18:50 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-24 14:06 [RFC v3 0/6] CPU reclaiming for SCHED_DEADLINE Luca Abeni
2016-10-24 14:06 ` [RFC v3 1/6] Track the active utilisation Luca Abeni
2016-10-25  9:09   ` Daniel Bristot de Oliveira
2016-10-25  9:29     ` luca abeni
2016-10-25 13:58       ` Steven Rostedt
2016-10-25 18:04         ` Luca Abeni
2016-11-18 14:23         ` Peter Zijlstra
2016-11-18 15:10           ` luca abeni
2016-11-18 15:28             ` Peter Zijlstra
2016-11-18 16:42           ` Steven Rostedt
2016-12-05 22:30           ` luca abeni
2016-12-06  8:35             ` Peter Zijlstra
2016-12-06  8:57               ` luca abeni
2016-12-06 13:47               ` luca abeni
2016-11-01 16:45   ` Juri Lelli
2016-11-01 21:10     ` luca abeni
2016-11-08 17:56       ` Juri Lelli
2016-11-08 18:17         ` Luca Abeni
2016-11-08 18:53           ` Juri Lelli
2016-11-08 19:09             ` Luca Abeni
2016-11-08 20:02               ` Juri Lelli
2016-11-09 15:25                 ` luca abeni
2016-11-09 16:29         ` luca abeni
2016-11-18 14:55         ` Peter Zijlstra
2016-11-18 13:55   ` Peter Zijlstra
2016-11-18 15:06     ` luca abeni
2016-10-24 14:06 ` [RFC v3 2/6] Improve the tracking of " Luca Abeni
2016-11-01 16:46   ` Juri Lelli
2016-11-01 21:46     ` luca abeni
2016-11-02  2:35       ` luca abeni
2016-11-10 10:04         ` Juri Lelli
2016-11-10 11:56           ` Juri Lelli
2016-11-10 12:15             ` luca abeni
2016-11-10 12:34               ` Juri Lelli
2016-11-10 12:45                 ` luca abeni
2016-11-02  2:41   ` luca abeni
2016-11-18 15:36   ` Peter Zijlstra
2016-11-18 15:56     ` luca abeni
2016-11-18 15:47   ` Peter Zijlstra
2016-11-18 16:06     ` luca abeni
2016-11-18 18:49       ` Peter Zijlstra [this message]
2016-10-24 14:06 ` [RFC v3 3/6] Fix the update of the total -deadline utilization Luca Abeni
2016-10-24 14:06 ` [RFC v3 4/6] GRUB accounting Luca Abeni
2016-10-24 14:06 ` [RFC v3 5/6] Do not reclaim the whole CPU bandwidth Luca Abeni
2016-10-24 14:06 ` [RFC v3 6/6] Make GRUB a task's flag Luca Abeni

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