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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.