From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Dave Hansen <dave@sr71.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Subject: Re: sched/cputime: sig->prev_stime underflow
Date: Thu, 11 Apr 2013 09:45:29 +0200 [thread overview]
Message-ID: <20130411074529.GA1629@redhat.com> (raw)
In-Reply-To: <5162E8DC.4080204@sr71.net>
On Mon, Apr 08, 2013 at 08:57:16AM -0700, Dave Hansen wrote:
> On 04/04/2013 04:41 PM, Frederic Weisbecker wrote:
> > Does this patch fix the issue for you?
> > https://lkml.org/lkml/2013/4/4/112
>
> Nope, that doesn't seem to make a difference. I'm still seeing the
> underflow. I'm pretty sure it's already gone to hell by the time it
> gets in to the loop that's patched there.
Perhaps this is glich introduced by commit
62188451f0d63add7ad0cd2a1ae269d600c1663d "cputime: Avoid multiplication
overflow on utime scaling" . Could you try to revert it and see if that
helps. If it does not, can you check if problem happen on 3.8 ?
Stanislaw
next prev parent reply other threads:[~2013-04-11 7:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 17:40 sched/cputime: sig->prev_stime underflow Dave Hansen
2013-04-04 23:41 ` Frederic Weisbecker
2013-04-08 15:57 ` Dave Hansen
2013-04-11 7:45 ` Stanislaw Gruszka [this message]
2013-04-11 18:47 ` Dave Hansen
2013-04-16 11:06 ` Stanislaw Gruszka
2013-04-16 21:05 ` Dave Hansen
2013-04-30 12:36 ` Stanislaw Gruszka
2013-05-02 16:05 ` Dave Hansen
2013-05-03 11:00 ` Stanislaw Gruszka
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130411074529.GA1629@redhat.com \
--to=sgruszka@redhat.com \
--cc=dave@sr71.net \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=seto.hidetoshi@jp.fujitsu.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox