perf/x86/intel: Mark MEM_LOAD_UOPS_MISS_RETIRED as precise on SNB
authorStephane Eranian <eranian@google.com>
Fri, 13 Sep 2013 20:16:46 +0000 (13:16 -0700)
committerIngo Molnar <mingo@kernel.org>
Sat, 14 Sep 2013 06:00:18 +0000 (08:00 +0200)
commit9d8e3f9693245415db0b7c58551a91fa9fd1f9c7
treecccad9cdea756d476d39dc894a8dee7df7fc4aa6
parentc0da0fa1d7ebe3c86747b10c92e0ac2be1524a8a
perf/x86/intel: Mark MEM_LOAD_UOPS_MISS_RETIRED as precise on SNB

On Intel SNB (SNB, SNB-EP), the event MEM_LOAD_UOPS_MISS_RETIRED
supports PEBS. It was missing for the SNB PEBS event constraint
table thereby preventing any measurement with PEBS for it.

This patch adds the event to the PEBS table for SNB.

WARNING: it should be noted that this event like a few others
are subject to the erratum BT241 for Xeon E5 (SNB-EP). As such,
the event may undercount when used with PEBS unless the
workaround is implemented. But without this patch and just the
workaround, the kernel would not allow precise sampling on this
event. BT241 is documented in:

  http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e5-family-spec-update.pdf

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: ak@linux.intel.com
Cc: zheng.z.yan@intel.com
Link: http://lkml.kernel.org/r/20130913201646.GA23981@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/cpu/perf_event_intel_ds.c