linux-kernel - Re: [tip:core/futexes] futex: use current->time_slack

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Message-ID: <49B913DC.6040807@linux.intel.com>
Date:	Thu, 12 Mar 2009 06:53:32 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	mingo@...hat.com, hpa@...or.com, dvhltc@...ibm.com,
	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	arjan@...ux.intel.com, peterz@...radead.org, tglx@...utronix.de,
	mingo@...e.hu
CC:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/futexes] futex: use current->time_slack_ns for rt tasks
 too

Darren Hart wrote:
> Commit-ID:  16f4993f4e9860715918efd4eeac928f8de1218b
> Gitweb:     http://git.kernel.org/tip/16f4993f4e9860715918efd4eeac928f8de1218b
> Author:     "Darren Hart" <dvhltc@...ibm.com>
> AuthorDate: Thu, 12 Mar 2009 00:55:59 -0700
> Commit:     Ingo Molnar <mingo@...e.hu>
> CommitDate: Thu, 12 Mar 2009 11:20:57 +0100
> 
> futex: use current->time_slack_ns for rt tasks too
> 
> RT tasks should set their timer slack to 0 on their own.  This
> patch removes the 'if (rt_task()) slack = 0;' block in
> futex_wait.

Hi,

can you explain the rationale for this reasoning?

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