Messages in this thread | | | Date | Tue, 21 Jun 2011 20:13:21 +0400 | Subject | Re: [RFC -tip] perf, x86: Add PERF_COUNT_HW_NMI_WATCHDOG event v2 | From | Cyrill Gorcunov <> |
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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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