perf/x86/intel: Fix SLM cache event list
authorKan Liang <kan.liang@intel.com>
Tue, 21 Apr 2015 09:34:41 +0000 (05:34 -0400)
committerIngo Molnar <mingo@kernel.org>
Fri, 8 May 2015 09:59:41 +0000 (11:59 +0200)
commit6d374056354a742eed4d0050498101e56e794c4b
treef03f738d250802781de0f3f84fc297e3b7694bf4
parent8b10c5e2b59ef2a80a07ab594a3b4987a4676211
perf/x86/intel: Fix SLM cache event list

iTLB-load-misses and LLC-load-misses count incorrectly on SLM.

There is no ITLB.MISSES support on SLM. Event PAGE_WALKS.I_SIDE_WALK
should be used to count iTLB-load-misses. This event counts when an
instruction (I) page walk is completed or started. Since a page walk
implies a TLB miss, the number of TLB misses can be counted by counting
the number of pagewalks.

DMND_DATA_RD counts both demand and DCU prefetch data reads. However,
LLC-load-misses should only count demand reads. There is no way to not
include prefetches with a single counter on SLM. So the LLC-load-misses
support should be removed on SLM.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1429608881-5055-1-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/cpu/perf_event_intel.c
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