From: Don Zickus <dzickus@redhat.com>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
mingo@elte.hu, peterz@infradead.org, aris@redhat.com,
linux-kernel@vger.kernel.org, randy.dunlap@oracle.com
Subject: Re: [PATCH 2/8] [nmi watchdog] touch_softlockup cleanups and softlockup_tick removal
Date: Thu, 13 May 2010 12:04:22 -0400 [thread overview]
Message-ID: <20100513160422.GO15159@redhat.com> (raw)
In-Reply-To: <20100513155313.GA5274@lenovo>
On Thu, May 13, 2010 at 07:53:13PM +0400, Cyrill Gorcunov wrote:
> On Wed, May 12, 2010 at 05:50:15PM -0400, Don Zickus wrote:
> ...
> > > Guys, could you please spend a few minutes and enlighten me a bit?
> > > Does all this series mean that we eventually will drop nmi-watchdog
> > > via io-apic (read via pic) as only the transition to perf complete?
> > >
> > > I recall someone said about to stop using io-apic, but just to be sure.
> >
> > Right, this code sits on top of the perf subsystem which uses lapic.
> > Eventually, the old nmi watchdog code will disappear along with the
> > support for io-apic.
> >
> > Cheers,
> > Don
> >
>
> Thanks for explanation, Don! So I assume (?) that io-apic
> nmi-watchdog is going to be dropped due to obsolescense of
> this mode, right?
Well partly. The other part is you can't really confirm an NMI came from
the io-apic or not unlike the lapic (where you can see if it crossed
zero). Therefore under io-apic, all unknown nmis were wrongly being
filtered as nmi watchdog interrupts.
Cheers,
Don
next prev parent reply other threads:[~2010-05-13 16:04 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-07 21:11 [PATCH 0/8] lockup detector changes Don Zickus
2010-05-07 21:11 ` [PATCH 1/8] [watchdog] combine nmi_watchdog and softlockup Don Zickus
2010-05-12 19:55 ` Frederic Weisbecker
2010-05-13 6:51 ` [tip:perf/nmi] lockup_detector: Combine nmi_watchdog and softlockup detector tip-bot for Don Zickus
2010-05-07 21:11 ` [PATCH 2/8] [nmi watchdog] touch_softlockup cleanups and softlockup_tick removal Don Zickus
2010-05-12 20:06 ` Frederic Weisbecker
2010-05-12 20:26 ` Don Zickus
2010-05-12 20:28 ` Frederic Weisbecker
2010-05-12 20:56 ` Don Zickus
2010-05-12 21:00 ` Frederic Weisbecker
2010-05-12 21:38 ` Cyrill Gorcunov
2010-05-12 21:50 ` Don Zickus
2010-05-13 15:53 ` Cyrill Gorcunov
2010-05-13 16:04 ` Don Zickus [this message]
2010-05-13 6:52 ` [tip:perf/nmi] lockup_detector: Touch_softlockup " tip-bot for Don Zickus
2010-05-07 21:11 ` [PATCH 3/8] [watchdog] remove old softlockup code Don Zickus
2010-05-13 6:52 ` [tip:perf/nmi] lockup_detector: Remove " tip-bot for Don Zickus
2010-05-07 21:11 ` [PATCH 4/8] [watchdog] remove nmi_watchdog.c file Don Zickus
2010-05-13 6:52 ` [tip:perf/nmi] lockup_detector: Remove " tip-bot for Don Zickus
2010-05-07 21:11 ` [PATCH 5/8] [x86] watchdog: move trigger_all_cpu_backtrace to its own die_notifier Don Zickus
2010-05-13 6:53 ` [tip:perf/nmi] x86: Move " tip-bot for Don Zickus
2010-05-07 21:11 ` [PATCH 6/8] [x86] watchdog: cleanup hw_nmi.c cruft Don Zickus
2010-05-13 6:53 ` [tip:perf/nmi] x86: Cleanup " tip-bot for Don Zickus
2010-05-07 21:11 ` [PATCH 7/8] [watchdog] resolve softlockup.c conflicts Don Zickus
2010-05-07 21:11 ` [PATCH 8/8] [watchdog] separate touch_nmi_watchdog code path from touch_watchdog Don Zickus
2010-05-13 6:53 ` [tip:perf/nmi] lockup_detector: Separate " tip-bot for Don Zickus
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