linux-kernel - [PATCH v2 2/5] perf/x86: add PERF_SAMPLE_SKID

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Date:   Thu,  2 Nov 2017 11:15:56 -0700
From:   Stephane Eranian <eranian@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     acme@...hat.com, peterz@...radead.org, mingo@...e.hu,
        ak@...ux.intel.com, kan.liang@...el.com, jolsa@...hat.com,
        Stephane Eranian <eranian@...il.com>
Subject: [PATCH v2 2/5] perf/x86: add PERF_SAMPLE_SKID_IP support for X86 PEBS

From: Stephane Eranian <eranian@...il.com>

This atch adds support for SKID_IP to Intel x86 processors in PEBS
mode.

Signed-off-by: Stephane Eranian <eranian@...gle.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 e1965e5ff570..b7afdf88f441 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1189,6 +1189,13 @@ 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)
-- 
2.7.4