linux-kernel - Re: [PATCH] sched: minor optimizations in wake_affine and select_task_rq

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Message-ID: <48E0FDC5.1080500@nortel.com>
Date:	Mon, 29 Sep 2008 10:09:41 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com,
	a.p.zijlstra@...llo.nl, mingo@...e.hu
Subject: Re: [PATCH] sched: minor optimizations in wake_affine and select_task_rq_fair

Amit K. Arora wrote:
> Hello,
> 
> Please consider this patch. It makes a few minor changes to
> sched_fair.c.
> 
> 
> sched: Minor optimizations in wake_affine and select_task_rq_fair
> 
> This patch does following:
> o Reduces the number of arguments to wake_affine().

At what point is it cheaper to pass items as args rather than 
recalculating them?  If reducing the number of args is desirable, what 
about removing the "this_cpu" and "prev_cpu" args and recalculating them 
in wake_affine()?

Chris
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