linux-kernel - Re: [2.6.22] negative time jump

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Message-ID: <46ADDEDA.1070201@sw.ru>
Date:	Mon, 30 Jul 2007 16:51:38 +0400
From:	Vasily Averin <vvs@...ru>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, devel@...nvz.org
Subject: Re: [2.6.22] negative time jump

Groundhog Day?

Vasily Averin wrote:
> [root@...8 ~]# echo 1 > /proc/timer_stats
> [root@...8 ~]# cat /proc/timer_stats
> Timer Stats Version: v0.1
> Sample period: 17.992 s
> 0 total events
> [root@...8 ~]# cat /proc/timer_stats
> Timer Stats Version: v0.1
> Sample period: -4366.278 s
> 0 total events
> [root@...8 ~]# cat /proc/timer_stats
> Timer Stats Version: v0.1
> Sample period: -4359.840 s
> 0 total events

[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: -5.060 s
0 total events
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 0.365 s
0 total events
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 8.675 s
0 total events
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: -4355.978 s
0 total events
[skip]

next loop:
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 9.968 s
0 total events
[root@...8 ~]# echo q > /proc/sysrq-trigger
Jul 30 11:10:17 ts28 now at 29196596844685 nsecs

[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 14.104 s
0 total events
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 17.666 s
0 total events
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 19.791 s
0 total events
[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 21.278 s
0 total events
[root@...8 ~]# echo q > /proc/sysrq-trigger
Jul 30 11:10:28 ts28 now at 24810199356545 nsecs

[root@...8 ~]# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: -4373.161 s
0 total events

Node is still alive and I'm able to look at proc files and press sysrq keys.

Thank you,
	Vasily Averin
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