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From: Ingo Molnar <mingo@elte.hu>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH, take 2] Speedup divides by cpu_power in scheduler
Date: Thu, 22 Feb 2007 09:19:20 +0100	[thread overview]
Message-ID: <20070222081920.GA16089@elte.hu> (raw)
In-Reply-To: <45DD5217.3000608@cosmosbay.com>


* Eric Dumazet <dada1@cosmosbay.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@elte.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

  reply	other threads:[~2007-02-22  8:23 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-21 21:10 [Patch 1/2] cciss: fix for 2TB support Mike Miller (OS Dev)
2007-02-22  3:14 ` Andrew Morton
2007-02-22  7:31   ` [PATCH] Speedup divides by cpu_power in scheduler Eric Dumazet
2007-02-22  7:56     ` Ingo Molnar
2007-02-22  8:19     ` [PATCH, take 2] " Eric Dumazet
2007-02-22  8:19       ` Ingo Molnar [this message]
2007-02-22 16:51   ` [Patch 1/2] cciss: fix for 2TB support Mike Miller (OS Dev)
2007-02-22 21:24     ` Andrew Morton
2007-02-22 21:41       ` James Bottomley
2007-02-22 22:02         ` Mike Miller (OS Dev)
2007-02-22 22:06           ` James Bottomley
2007-02-23 20:52             ` Mike Miller (OS Dev)
2007-02-24  6:35               ` Andrew Morton
2007-02-22 20:18   ` Mike Miller (OS Dev)
2007-02-22 21:22     ` Miller, Mike (OS Dev)

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