From: Prarit Bhargava <prarit@redhat.com>
To: Andi Kleen <ak@suse.de>
Cc: virtualization@lists.linux-foundation.org,
Jeremy Fitzhardinge <jeremy@goop.org>,
virtualization@lists.osdl.org,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>, John Hawkes <hawkes@sgi.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Eric Dumazet <dada1@cosmosbay.com>
Subject: Re: [patch 3/4] Locally disable the softlockup watchdog rather than touching it
Date: Wed, 28 Mar 2007 10:13:04 -0400 [thread overview]
Message-ID: <460A77F0.7030901@redhat.com> (raw)
In-Reply-To: <200703281609.04956.ak@suse.de>
Andi Kleen wrote:
> On Wednesday 28 March 2007 16:00, Prarit Bhargava wrote:
>
>>>> touch_nmi_watchdog is attempting to tickle _all_ CPUs softlockup watchdogs.
>>>>
>>>>
>>> It is supposed to only touch the current CPU, just like it only touches
>>> the NMI watchdog on the current CPU.
>>>
>>>
>>>
>> Andi,
>>
>> (sorry for the cut-and-paste).
>>
>> touch_nmi_watchdogs sets EACH CPUs alert_counter to 0.
>>
>
> You're right. Sorry for the confusion.
>
> But just touching the current CPU would make much more sense. After all
> the caller doesn't know anything about the state of other CPUs. Perhaps it would be best
> to just change that and keep the softlockup semantics.
>
Yeah -- you're probably right, and besides that we're not seeing a crazy
# of softlockup messages after touch_nmi_watchdogs calls.
My original comments regarding the code still stand though -- we
shouldn't have multiple methods of playing with the softlockup watchdog.
P.
> -Andi
>
next prev parent reply other threads:[~2007-03-28 14:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 21:49 [patch 0/4] Revised softlockup watchdog improvement patches Jeremy Fitzhardinge
2007-03-27 21:49 ` [patch 1/4] Ignore stolen time in the softlockup watchdog Jeremy Fitzhardinge
2007-04-24 6:49 ` Andrew Morton
2007-04-24 6:58 ` Jeremy Fitzhardinge
2007-04-24 7:09 ` Andrew Morton
2007-04-24 17:51 ` Jeremy Fitzhardinge
2007-04-24 17:57 ` Andrew Morton
2007-04-24 18:16 ` Jeremy Fitzhardinge
2007-04-24 18:32 ` Andrew Morton
2007-04-24 20:00 ` Jeremy Fitzhardinge
2007-04-24 20:14 ` Andrew Morton
2007-04-24 20:46 ` Jeremy Fitzhardinge
2007-04-24 20:24 ` Jeremy Fitzhardinge
2007-04-24 20:33 ` Andrew Morton
2007-04-24 20:48 ` Jeremy Fitzhardinge
2007-04-24 20:52 ` Daniel Walker
2007-04-24 20:59 ` Ingo Molnar
2007-04-24 21:01 ` Daniel Walker
2007-04-24 21:14 ` Andrew Morton
2007-04-24 21:20 ` Andi Kleen
2007-04-24 21:33 ` Daniel Walker
2007-03-27 21:49 ` [patch 2/4] percpu enable flag for " Jeremy Fitzhardinge
2007-03-27 21:49 ` [patch 3/4] Locally disable the softlockup watchdog rather than touching it Jeremy Fitzhardinge
2007-03-28 13:33 ` Prarit Bhargava
2007-03-28 13:50 ` Andi Kleen
2007-03-28 14:00 ` Prarit Bhargava
2007-03-28 14:09 ` Andi Kleen
2007-03-28 14:13 ` Prarit Bhargava [this message]
2007-03-28 14:44 ` Jeremy Fitzhardinge
2007-03-28 14:51 ` Prarit Bhargava
2007-03-28 15:22 ` Jeremy Fitzhardinge
2007-03-28 15:27 ` Prarit Bhargava
2007-03-27 21:49 ` [patch 4/4] Add global disable/enable for softlockup watchdog Jeremy Fitzhardinge
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