linux-kernel - Re: [git pull] scheduler changes for v2.6.26

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Date:	Tue, 22 Apr 2008 03:49:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kjwinchester@...il.com
Cc:	mingo@...e.hu, elendil@...net.nl, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	a.p.zijlstra@...llo.nl, efault@....de, richie@...erworld.net,
	rjw@...k.pl
Subject: Re: [git pull] scheduler changes for v2.6.26

From: Kevin Winchester <kjwinchester@...il.com>
Date: Tue, 22 Apr 2008 06:41:47 -0300

> kevin@...khine:~/linux$ ./watch-rq-clock.sh
> 89.986517
> 81.033471
> 76.942776
> 90.986318
> 75.988551
> 85.987089
> 74.988696
> 85.987078
> 73.988858
> 88.986641
> 68.989600

The results on my 128-cpu Niagara2 box are even more interesting:

davem@...amba:~$ /bin/bash ./watch-rq-clock.sh 
0
0
0
0
0
0
0
0
0
0
0
0
0
...

I guess this script doesn't work correctly when the cpu
whose clock value it greps out of /proc/sched_debug is
in NOHZ mode?
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