Messages in this thread | | | Date | Thu, 13 May 2010 12:04:22 -0400 | From | Don Zickus <> | Subject | Re: [PATCH 2/8] [nmi watchdog] touch_softlockup cleanups and softlockup_tick removal |
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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
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