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Date: Tue, 03 Apr 2007 17:38:44 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Jeremy Fitzhardinge <jeremy@...p.org>
CC: Ulrich Drepper <drepper@...hat.com>,
Davide Libenzi <davidel@...ilserver.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers
Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>> Sounds like it would need a device which can be waited upon for changes.
>
> A vdso-like shared page could have a futex in it.
Yes, but a futex couldn't be waited upon with a bunch of other things as
part of a poll or a select. The cost of reading the information is minimal.
-hpa
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