linux-kernel - Re: [PATCH] make poll_idle behave more like the other idle methods

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Message-ID: <20080828090036.GC19422@elte.hu>
Date:	Thu, 28 Aug 2008 11:00:36 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Joe Korty <joe.korty@...r.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] make poll_idle behave more like the other idle methods


* Joe Korty <joe.korty@...r.com> wrote:

> Make poll_idle() behave more like the other idle methods.
> 
> Currently, poll_idle() returns immediately.  The other
> idle methods all wait indefinately for some condition
> to come true before returning.  poll_idle should emulate
> these other methods and also wait for a return condition,
> in this case, for need_resched() to become 'true'.
> 
> Without this delay the idle loop spends all of its time
> in the outer loop that calls poll_idle.  This outer loop,
> these days, does real work, some of it under rcu locks.
> That work should only be done when idle is entered and
> when idle exits, not continuously while idle is spinning.

i'm wondering, what's the motivation, have you actually seen
anything bad/undesired happen due to that?

	Ingo
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