linux-kernel - Re: [PATCH] sched/deadline: Always calculate end of period on sched

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Message-ID: <20160223100424.4ebfea45@gandalf.local.home>
Date:	Tue, 23 Feb 2016 10:04:24 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Juri Lelli <juri.lelli@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Clark Williams <williams@...hat.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [PATCH] sched/deadline: Always calculate end of period on
 sched_yield()

On Tue, 23 Feb 2016 13:28:22 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> Would something like this make sense instead?

It works perfectly.

Reported-by: Steven Rostedt <rostedt@...dmis.org>
Tested-by: Steven Rostedt <rostedt@...dmis.org>

Thanks!

-- Steve

> 
> It also retains the ->runtime while yielded, and would actually 'fix' a
> case where, when we call yield, we would have had a negative runtime
> after update_curr_dl().
> 
> The current code will 'gift' us extra runtime in that case.
> 
> ---