[PATCH 2/5] perf/x86: add PERF_SAMPLE_SKID_IP support for X86 PEBS

Stephane Eranian
2017-06-15T13:58:04Z

This patch adds support for SKID_IP to Intel x86 processors
in PEBS mode. In that case, the off-by-1 IP from PEBS is returned in
the SKID_IP field.

Signed-off-by: Stephane Eranian <eranian@google.com>
---
arch/x86/events/intel/ds.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index c6d23ffe422d..ee17de5d6b8d 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1169,6 +1169,13 @@ static void setup_pebs_sample_data(struct perf_event *event,
x86_pmu.intel_cap.pebs_format >= 1)
data->addr = pebs->dla;

+ /*
+ * unmodified, skid IP which is guaranteed to be the next
+ * dyanmic instruction
+ */
+ if (sample_type & PERF_SAMPLE_SKID_IP)
+ data->skid_ip = pebs->ip;
+
if (x86_pmu.intel_cap.pebs_format >= 2) {
/* Only set the TSX weight when no memory weight. */
if ((sample_type & PERF_SAMPLE_WEIGHT) && !fll)
--
2.13.1.518.g3df882009-goog