linux-kernel - Re: [PATCH -v8][RFC] mutex: implement adaptive spinning

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Date:	Wed, 14 Jan 2009 12:41:07 +0100
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v8][RFC] mutex: implement adaptive spinning

> The key criteria for the busy wait is that the lock owner has to be running on
> a (different) cpu. The idea is that as long as the owner is running, there is a
> fair chance it'll release the lock soon, and thus we'll be better off spinning
> instead of blocking/scheduling.

Won't this make Linux less "green"? (-> use more power since busy loops
use more power than idle loops) If so, maybe it should be make
configurable somewhere?


Folkert van Heusden

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