linux-kernel - Re: [RFC][PATCH 10/22] sched: add a syscall to wait for the next instance

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Date:	Thu, 11 Nov 2010 20:21:57 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raistlin <raistlin@...ux.it>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 10/22] sched: add a syscall to wait for the next
 instance

On Fri, 2010-10-29 at 08:35 +0200, Raistlin wrote:
> 
> Introduce sched_wait_interval() syscall (and scheduling class
> interface call). In general, this aims at providing each scheduling
> class with a mean of making one of its own task sleep for some time
> according to some specific rule of the scheduling class itself.
> 
Did we have an actual use case for this? I seem to remember that the
last time we seemed to thing job wakeups are due to external events, in
which case we don't need this.

I think we should try without this patch first and only consider this
once we merged the base functionality and have a solid use-case for
this.
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