Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs

Robert Richter
2010-08-24T17:12:09Z

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

--
Advanced Micro Devices, Inc.
Operating System Research Center