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    SubjectRe: [RFC -tip] perf, x86: Add PERF_COUNT_HW_NMI_WATCHDOG event v2
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    Ok, I'll take a look (sorry for top posting, ISP problem)

    On Tuesday, June 21, 2011, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
    > On Tue, 2011-06-21 at 19:40 +0400, Cyrill Gorcunov wrote:
    >> On Tue, Jun 21, 2011 at 7:23 PM, Don Zickus <dzickus@redhat.com> wrote:
    >> > On Thu, Apr 28, 2011 at 07:37:25PM +0400, Cyrill Gorcunov wrote:
    >> >> Due to restriction and specifics of Netburst PMU we need a separated
    >> >> event for NMI watchdog. In particular every Netburst event consume not
    >> >> just a counter and config register, but also an additional ESCR register.
    >> >> Since ESCR registers are grouped upon counters (i.e. if ESCR is occupied
    >> >> for some event there is no room for another event to enter the room until
    >> >> it's released) we need to pick up "least" used ESCR (or most available)
    >> >> for nmi-watchdog purpose -- MSR_P4_CRU_ESCR2/3 was chosen.
    >> >>
    >> >> Note that on all other PMUs which support relocation of events between
    >> >> counters this event is a simple alias for PERF_COUNT_HW_CPU_CYCLES.
    >> >
    >> > Cyril,
    >> >
    >> > What ever happened with this patch?
    >> >
    >> > Cheers,
    >> > Don
    >> >
    >>
    >> Well, it's flowing around, I didn't get any more Ack's other than your. Since it
    >> introduces kind of abi I presume more ack's would be welcome before it
    >> (possibly) get merged.
    >
    > we could avoid that abi thing by simply not making it an exposed event
    >
    > Its not like userspace ever should be using it anyway
    >


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