From: Srinivas Nayak <sinu_nayak2001@yahoo.co.in>
To: john stultz <johnstul@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: BUG: Is it a bug in Linux time() function or Linux OS calls?
Date: Thu, 11 Mar 2010 11:40:38 +0530 (IST) [thread overview]
Message-ID: <609314.24705.qm@web7608.mail.in.yahoo.com> (raw)
In-Reply-To: <1f1b08da1003100919k57d8cc6au6ff753ebf5b6c2f8@mail.gmail.com>
Dear John,
Thanks for your answer. This is informative.
With best regards,
Yours sincerely,
Srinivas Nayak
My Home page: http://www.mathmeth.com/sn/
My Blog: http://srinivas-nayak.blogspot.com
--- On Wed, 10/3/10, john stultz <johnstul@us.ibm.com> wrote:
> From: john stultz <johnstul@us.ibm.com>
> Subject: Re: BUG: Is it a bug in Linux time() function or Linux OS calls?
> To: "Srinivas Nayak" <sinu_nayak2001@yahoo.co.in>
> Cc: linux-kernel@vger.kernel.org
> Date: Wednesday, 10 March, 2010, 10:49 PM
> On Tue, Mar 9, 2010 at 11:59 PM,
> Srinivas Nayak
> <sinu_nayak2001@yahoo.co.in>
> wrote:
> > I wrote a small program, that creates files at an
> interval of 1 minute. But the time at which the file is
> created and last written and the last modification time of
> the file as shown by ls command differs by 1 second. The
> code and the output is presented below. please let me know
> where could be the bug?
> >
> [snip]
> > Some system info:
> > ===========
> > Linux new 2.6.24-19-server #1 SMP Wed Jun 18 14:44:47
> UTC 2008 x86_64 GNU/Linux
> > Gnu C 4.2.4
> > Linux C Library 2.7
> > binutils 2.18.0.20080103
> > util-linux 2.13.1
> > Console-tools 0.2.3
> > Sh-utils 6.10
> > ===========
>
> Hrm. Is CONFIG_NO_HZ enabled? If so this is a known
> issue. The
> filesystem timestamps use xtime, which is normally updated
> every HZ.
> However to reduce overhead with NO_HZ we changed the update
> to be a
> half-second, which can cause issues like what you
> describe.
>
> The issue has since been resolved, so I'd be interested to
> hear if you
> can still reproduce it on a more recent kernel.
>
> thanks
> -john
>
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prev parent reply other threads:[~2010-03-11 6:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-10 7:59 BUG: Is it a bug in Linux time() function or Linux OS calls? Srinivas Nayak
2010-03-10 8:47 ` David Newall
2010-03-10 9:13 ` Srinivas Nayak
2010-03-10 17:19 ` john stultz
2010-03-11 6:10 ` Srinivas Nayak [this message]
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