mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Anton Blanchard <anton@samba.org>
To: Don Zickus <dzickus@redhat.com>
Cc: uobergfe@redhat.com, drjones@redhat.com,
	akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: Confusing behaviour with /proc/sys/kernel/nmi_watchdog
Date: Thu, 6 Nov 2014 05:53:57 +1100	[thread overview]
Message-ID: <20141106055357.530e1458@kryten> (raw)
In-Reply-To: <20141105145356.GL135937@redhat.com>


Hi Don,

> > commit 9919e39a1738 ("kvm: ensure hard lockup detection is disabled
> > by default") provided a way for the kernel to disable the hard
> > lockup detector at runtime.
> > 
> > I'm using it on ppc64 but notice some weird behaviour with the
> > nmi_watchdog procfs variable. At boot, that the hard lockup
> > detector appears to be enabled even when we disable it via
> > watchdog_enable_hardlockup_detector(false):
> > 
> > # cat /proc/sys/kernel/nmi_watchdog 
> > 1
> > 
> > I have to echo 0 to it then echo 1 again to enable it.
> 
> I believe Andrew answered the question for you, it's a WIP and we have
> patches to clean that up.

Thanks, yes good to see it being worked on.

> I don't see ppc64 watchdog support in arch/powerpc, is that something
> you are working with on implementing?

I've submitted it over on linuxppc-dev:

http://patchwork.ozlabs.org/patch/406802/

Anton

      reply	other threads:[~2014-11-05 18:54 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-04 22:34 Anton Blanchard
2014-11-05 10:26 ` Andrew Jones
2015-01-21  3:39   ` Anton Blanchard
2015-01-21 10:52     ` Andrew Jones
2015-01-21 14:30       ` Don Zickus
2014-11-05 14:53 ` Don Zickus
2014-11-05 18:53   ` Anton Blanchard [this message]

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=20141106055357.530e1458@kryten \
    --to=anton@samba.org \
    --cc=akpm@linux-foundation.org \
    --cc=drjones@redhat.com \
    --cc=dzickus@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mpe@ellerman.id.au \
    --cc=uobergfe@redhat.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
Powered by JetHome