[PATCH 13/35] perf tools: Add machine_pid and vcpu to perf_sample

Adrian Hunter
2022-07-11T10:11:54Z

When parsing a sample with a sample ID, copy machine_pid and vcpu from
perf_sample_id to perf_sample.

Note, machine_pid will be zero when unused, so only a non-zero value
represents a guest machine. vcpu should be ignored if machine_pid is zero.

Note also, machine_pid is used with events that have come from injecting a
guest perf.data file, however guest events recorded on the host (i.e. using
perf kvm) have the (QEMU) hypervisor process pid to identify them - refer
machines__find_for_cpumode().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/event.h | 2 ++
tools/perf/util/evlist.c | 14 +++++++++++++-
tools/perf/util/evsel.c | 1 +
3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index cdd72e05fd28..a660f304f83c 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -148,6 +148,8 @@ struct perf_sample {
u64 code_page_size;
u64 cgroup;
u32 flags;
+ u32 machine_pid;
+ u32 vcpu;
u16 insn_len;
u8 cpumode;
u16 misc;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 03fbe151b0c4..64f5a8074c0c 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1507,10 +1507,22 @@ int evlist__start_workload(struct evlist *evlist)
int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
{
struct evsel *evsel = evlist__event2evsel(evlist, event);
+ int ret;

if (!evsel)
return -EFAULT;
- return evsel__parse_sample(evsel, event, sample);
+ ret = evsel__parse_sample(evsel, event, sample);
+ if (ret)
+ return ret;
+ if (perf_guest && sample->id) {
+ struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id);
+
+ if (sid) {
+ sample->machine_pid = sid->machine_pid;
+ sample->vcpu = sid->vcpu.cpu;
+ }
+ }
+ return 0;
}

int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 9a30ccb7b104..14396ea5a968 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2365,6 +2365,7 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
data->misc = event->header.misc;
data->id = -1ULL;
data->data_src = PERF_MEM_DATA_SRC_NONE;
+ data->vcpu = -1;

if (event->header.type != PERF_RECORD_SAMPLE) {
if (!evsel->core.attr.sample_id_all)
--
2.25.1