From: Kan Liang kan.liang@intel.com
[ Upstream commit 33636732dcd7cc738a5913bb730d663c6b03c8fb ]
cycles:p and cycles:pp do not work on SLM since commit:
86a04461a99f ("perf/x86: Revamp PEBS event selection")
UOPS_RETIRED.ALL is not a PEBS capable event, so it should not be used to count cycle number.
Actually SLM calls intel_pebs_aliases_core2() which uses INST_RETIRED.ANY_P to count the number of cycles. It's a PEBS capable event. But inv and cmask must be set to count cycles.
Considering SLM allows all events as PEBS with no flags, only INST_RETIRED.ANY_P, inv=1, cmask=16 needs to handled specially.
Signed-off-by: Kan Liang kan.liang@intel.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: http://lkml.kernel.org/r/1421084541-31639-1-git-send-email-kan.liang@intel.c... Cc: Arnaldo Carvalho de Melo acme@kernel.org Cc: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kernel/cpu/perf_event_intel_ds.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 46211bcc813e..423cbd9bea3e 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -568,8 +568,8 @@ struct event_constraint intel_atom_pebs_event_constraints[] = { };
struct event_constraint intel_slm_pebs_event_constraints[] = { - /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ - INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), + /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ + INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x1), /* Allow all events as PEBS with no flags */ INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), EVENT_CONSTRAINT_END