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From: tony@bakeyournoodle.com (Tony Breeds)
To: Olof Johansson <olof@lixom.net>
Cc: paulus@samba.org, linuxppc-dev@ozlabs.org
Subject: Re: New time code miscalculates cpu usage
Date: Wed, 17 Oct 2007 16:07:48 +1000	[thread overview]
Message-ID: <20071017060747.GF9814@bakeyournoodle.com> (raw)
In-Reply-To: <20071016202525.GA11837@lixom.net>

On Tue, Oct 16, 2007 at 03:25:25PM -0500, Olof Johansson wrote:
> Hi,
> 
> Not sure when this started happening, but I wanted to report it. I'll
> start bisecting in a day or two if noone else has gotten around to
> looking at it:
> 
> $ echo "int main(void) { while(1); }" > test.c ; gcc test.c
> $ time ./a.out & sleep 2 ; killall a.out
> real    0m2.008s
> user    0m4.014s
> sys     0m0.002s
> 
> Seen on POWER5 and PA6T, haven't tried anything else yet.

For what it's worth, this is my bug.  I suspected it, and git bisect
confirmed it.I have an ugly work around now, but hope to have something
better out tomorrow.

Thanks Olof.

Yours Tony

  linux.conf.au        http://linux.conf.au/ || http://lca2008.linux.org.au/
  Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!

  reply	other threads:[~2007-10-17  6:07 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-16 20:25 New time code miscalculates cpu usage Olof Johansson
2007-10-17  6:07 ` Tony Breeds [this message]
2007-10-24 20:19   ` Olof Johansson
2007-10-24 20:17 ` Sergei Shtylyov
2007-10-24 21:56   ` Benjamin Herrenschmidt
2007-10-25  0:19     ` Paul Mackerras
2007-10-25  0:53       ` Benjamin Herrenschmidt
2007-10-25 12:46     ` Sergei Shtylyov

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