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

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Date:	Mon, 02 Feb 2009 19:35:14 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	mtk.manpages@...il.com
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

On Tue, 2009-02-03 at 07:29 +1300, Michael Kerrisk wrote:
> 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.)

Ah, I'll try to remember that.

> 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.

Yeah, but I found it eventually, but I generally don't read a full
manpage when I'm looking for related functions, only the SEE ALSO
section.

> 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.

Thanks.

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