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SubjectRe: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs
On Tue, Aug 24, 2010 at 09:20:22PM +0400, Cyrill Gorcunov wrote:
> On Tue, Aug 24, 2010 at 07:09:36PM +0200, Robert Richter wrote:
> > On 24.08.10 12:22:52, Cyrill Gorcunov wrote:
> > > Btw, guys, I fail to see how new nmi_watchdog work, we have
> > > default_do_nmi
> > > if (!(reason & 0xc0)) {
> > > if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == == NOTIFY_STOP)
> > > return
> > > if (nmi_watchdog_tick(regs, reason))
> > > return
> > >
> > > but perf_event_nmi_handler returns NOTIFY_STOP when watchdog is perf event
> > > and nmi_watchdog_tick _never_ called, or (most probably) I miss something?
> >
> > The watchdog is disabled during profiling (perf and oprofile) by
> > calling disable_lapic_nmi_watchdog().
> >
> > -Robert
> >
>
> Huh? iirc Don have switched nmi watchdog to native perf subsystem, ie watchdog
> uses PERF_COUNT_HW_CPU_CYCLES event, letme check...
>
> -- Cyrill

False alarm, perf watchdog uses own handler. Sorry for noise ;)

-- Cyrill


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