Messages in this thread | | | Date | Fri, 6 May 2011 09:38:32 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] perf events, x86: Add SandyBridge stalled-cycles-frontend/backend events |
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* Lin Ming <ming.m.lin@intel.com> wrote:
> Extend the Intel SandyBridge PMU driver with definitions > for generic front-end and back-end stall events. > > ( As commit 3011203 says, these are only approximations. ) > > Signed-off-by: Lin Ming <ming.m.lin@intel.com> > --- > arch/x86/kernel/cpu/perf_event_intel.c | 6 ++++++ > 1 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c > index c1ec7a5..61cbf48 100644 > --- a/arch/x86/kernel/cpu/perf_event_intel.c > +++ b/arch/x86/kernel/cpu/perf_event_intel.c > @@ -1485,6 +1485,12 @@ static __init int intel_pmu_init(void) > > x86_pmu.event_constraints = intel_snb_event_constraints; > x86_pmu.pebs_constraints = intel_snb_pebs_events; > + > + /* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */ > + intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x180010e; > + /* UOPS_DISPATCHED.THREAD,c=1,i=1 to count stall cycles*/ > + intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x18001b1; > +
Nice!
Could you check Intel Atom perhaps as well, does it have any useful event to approximate this?
Thanks,
Ingo
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