[tip:perf/core] perf intel-pt: Prepare to synthesize PEBS samples

tip-bot for Adrian Hunter
2019-06-22T06:38:32Z

Commit-ID: e62ca655eea7ad4956929f647c2d9fb36aeff90e
Gitweb: https://git.kernel.org/tip/e62ca655eea7ad4956929f647c2d9fb36aeff90e
Author: Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Mon, 10 Jun 2019 10:27:56 +0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 17 Jun 2019 15:57:17 -0300

perf intel-pt: Prepare to synthesize PEBS samples

Add infrastructure to prepare for synthesizing PEBS samples but leave
the actual synthesis to later patches.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190610072803.10456-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/intel-pt.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 893cef494a43..cc91c1413c22 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -101,6 +101,9 @@ struct intel_pt {
u64 pwrx_id;
u64 cbr_id;

+ bool sample_pebs;
+ struct perf_evsel *pebs_evsel;
+
u64 tsc_bit;
u64 mtc_bit;
u64 mtc_freq_bits;
@@ -1535,6 +1538,11 @@ static int intel_pt_synth_pwrx_sample(struct intel_pt_queue *ptq)
pt->pwr_events_sample_type);
}

+static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq __maybe_unused)
+{
+ return 0;
+}
+
static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
pid_t pid, pid_t tid, u64 ip, u64 timestamp)
{
@@ -1622,6 +1630,16 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
ptq->ipc_cyc_cnt = ptq->state->tot_cyc_cnt;
}

+ /*
+ * Do PEBS first to allow for the possibility that the PEBS timestamp
+ * precedes the current timestamp.
+ */
+ if (pt->sample_pebs && state->type & INTEL_PT_BLK_ITEMS) {
+ err = intel_pt_synth_pebs_sample(ptq);
+ if (err)
+ return err;
+ }
+
if (pt->sample_pwr_events && (state->type & INTEL_PT_PWR_EVT)) {
if (state->type & INTEL_PT_CBR_CHG) {
err = intel_pt_synth_cbr_sample(ptq);