linux-kernel - Negative values in /proc/latency

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Message-ID: <4e5e476b0901310542n796dafbem5c656da07a2f8a56@mail.gmail.com>
Date:	Sat, 31 Jan 2009 14:42:20 +0100
From:	Corrado Zoccolo <czoccolo@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Negative values in /proc/latency_stats

Hello,
I found negative numbers sometimes appear in /proc/latency_stats
(vanilla kernel 2.6.29-rc3, on x86 cpu, configuration attached)

[corrado@...alhost ~]$ while sleep 1; do grep -- - /proc/latency_stats
>> neg_stats; done
^Z
[1]+  Stopped                 sleep 1
[corrado@...alhost ~]$ cat neg_stats
1 -486373534 -486373534 sys_rt_sigsuspend sysenter_do_call
1 -486373534 -486373534 sys_rt_sigsuspend sysenter_do_call
1 -486373534 -486373534 sys_rt_sigsuspend sysenter_do_call


I suspect this can be the cause for
https://bugs.launchpad.net/ubuntu/+source/latencytop/+bug/297776 , as
I saw it happening on my machine during a kernel recompilation.

Corrado

Download attachment "config" of type "application/octet-stream" (65257 bytes)