linux-kernel - Re: [PATCH, take 2] Speedup divides by cpu

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Date:	Thu, 22 Feb 2007 09:19:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, take 2] Speedup divides by cpu_power in scheduler


* Eric Dumazet <dada1@...mosbay.com> wrote:

> Ingo suggested to rename cpu_power to __cpu_power to make clear it 
> should not be modified without changing its reciprocal value too.

thanks,

Acked-by: Ingo Molnar <mingo@...e.hu>

> I did not convert the divide in cpu_avg_load_per_task(), because 
> tracking nr_running changes may be not worth it ? We could use a 
> static table of 32 reciprocal values but it would add a conditional 
> branch and table lookup.

not worth it i think. Lets wait for it to show up in an oprofile? (if 
ever)

	Ingo
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