From: Con Kolivas <kernel@kolivas.org>
To: mru@users.sourceforge.net (=?iso-8859-1?q?M=E5ns?=
	=?iso-8859-1?q?=20Rullg=E5rd?=),
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] O17int
Date: Wed, 20 Aug 2003 11:19:40 +1000
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On Wed, 20 Aug 2003 04:58, M?ns Rullg?rd wrote:
> Another XEmacs strangeness:
>
> When compiling from xemacs, everything is fine until the compilation
> is done.  Then xemacs starts spinning wildly in some loop doing this:
> This goes on for anything from half a second to several seconds.
> During that time other processes, except X, are starved.
>
> I saw this first with 2.6.0-test1 vanilla, then it went away in -test2
> and -test3, only to show up again with O16.3int.  My O16.2 kernel
> seems ok, which seems strange to me since the difference from O16.2 to
> O16.3 is very small.

While being a small patch, 16.2-16.3 was a large change. It removed the very 
aggressive starvation avoidance of spin on wait waker/wakee in 16.2, which 
clearly helped your issue.

> Any ideas?

Pretty sure we have another spinner. A reniced -11 batch run of top -d 1 and 
vmstat during the spinning, and a kernel profile for that time will be 
helpful.

Con

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