linux-kernel - Re: [RFC PATCH 5/6] sched: Remove needless round trip nsecs <-> tick conversion of steal time

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Message-ID: <5318CEFB.9040606@redhat.com>
Date:	Thu, 06 Mar 2014 14:39:39 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 5/6] sched: Remove needless round trip nsecs <-> tick
 conversion of steal time

On 03/06/2014 12:56 PM, Frederic Weisbecker wrote:
> When update_rq_clock_task() accounts the pending steal time for a task,
> it converts the steal delta from nsecs to tick then from tick to nsecs.
>
> There is no apparent good reason for doing that though because both
> the task clock and the prev steal delta are u64 and store values
> in nsecs.
>
> So lets remove the needless conversion.
>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Acked-by: Rik van Riel <riel@...hat.com>

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