From: Don Zickus <dzickus@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Mandeep Singh Baines <msb@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.cz>
Subject: Re: [PATCH] watchdog: Make sure the watchdog thread gets CPU on loaded system
Date: Thu, 15 Mar 2012 10:35:49 -0400 [thread overview]
Message-ID: <20120315143549.GC3941@redhat.com> (raw)
In-Reply-To: <1331820051.18960.187.camel@twins>
On Thu, Mar 15, 2012 at 03:00:51PM +0100, Peter Zijlstra wrote:
> On Thu, 2012-03-15 at 13:42 +0100, Ingo Molnar wrote:
> > So unless there's concensus to remove everything but the hard
> > lockup detection facilities, lets solve the technical problem at
> > hand, ok?
>
> Well, at least make it possible to disable the silly soft thing.
>
> And I really wouldn't know how the soft thing could possible help,
> except when not actually having a NMI watchdog. What case does it
> trigger where the NMI one doesn't?
I think softlockup really boils down to a pre-emption disabled detector
much like how the hardlockup really is a interrupts disabled detector.
The amount of code preventing the scheduler from running is most likely a
lot lower than the code the prevents interrrupts from happening.
Cheers,
Don
next prev parent reply other threads:[~2012-03-15 14:36 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 20:38 [PATCH] watchdog: Make sure the watchdog thread gets CPU on loaded system Don Zickus
2012-03-14 20:59 ` Mandeep Singh Baines
2012-03-14 23:19 ` Andrew Morton
2012-03-15 1:45 ` Mandeep Singh Baines
2012-03-15 11:00 ` Peter Zijlstra
2012-03-15 11:06 ` Peter Zijlstra
2012-03-15 12:42 ` Ingo Molnar
2012-03-15 14:00 ` Peter Zijlstra
2012-03-15 14:35 ` Don Zickus [this message]
2012-03-15 15:39 ` Mandeep Singh Baines
2012-03-15 16:10 ` Peter Zijlstra
2012-03-15 16:11 ` Peter Zijlstra
2012-03-15 16:16 ` Peter Zijlstra
2012-03-15 17:04 ` Mandeep Singh Baines
2012-03-15 8:02 ` Michal Hocko
2012-03-15 15:54 ` Don Zickus
2012-03-15 16:04 ` Peter Zijlstra
2012-03-19 22:00 ` Andrew Morton
2012-03-15 16:14 ` Michal Hocko
2012-03-15 17:14 ` Don Zickus
-- strict thread matches above, loose matches on Subject: below --
2012-03-13 9:45 [PATCH] watchdog: make " Michal Hocko
2012-03-13 13:42 ` Don Zickus
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