linux-kernel - Re: [Bugme-new] [Bug 12562] New: High overhead while switching or synchronizing threads on different cores

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Date:	Tue, 3 Feb 2009 07:29:39 +1300
From:	Michael Kerrisk <mtk.manpages@...glemail.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	Thomas Pilarski <thomas.pi@...or.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 12562] New: High overhead while switching or 
	synchronizing threads on different cores

Hi Peter,

On Tue, Feb 3, 2009 at 1:15 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, 2009-02-02 at 09:55 +0100, Peter Zijlstra wrote:
>
>> Ah, that was a good clue, apparently all you need to so it use
>> random_r() and provide your own state and all should be well.
>
> Michael, would it make sense to add the random_r() family to the "SEE
> ALSO" section of the random() man page?
>
> (Admittedly, my random() manpage is ancient: 2008-03-07, so it might be
> this is already the case, in which case, ignore me :)

(Up-to-date version of the pages can always be found online at the
location in the .sig.)

Well, the man page already had this text under notes:

       This  function  should  not  be  used  in  cases where multiple
       threads use random() and the behavior should  be  reproducible.
       Use random_r(3) for that purpose.

But it certainly doesn't hurt to have random_r(3) also listed under
the SEE ALSO, and I've added it for man-pages-3.18.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
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