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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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