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perf record: Add new option to sample identifier

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In preparation for recording sideband events in a virtual machine guest so
that they can be injected into a host perf.data file.

Add an option to always include sample type PERF_SAMPLE_IDENTIFIER.

Committer testing:

  # perf record sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.020 MB perf.data (7 samples) ]
  # perf evlist -v
  cycles: size: 128, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
  #
  #
  # perf record --sample-identifier sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.022 MB perf.data (7 samples) ]
  # perf evlist -v
  cycles: size: 128, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
  #

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220615052511.4441-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-06-15 08:25:11 +03:00 committed by Arnaldo Carvalho de Melo
parent 6b080312fc
commit 61110883a0
4 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
tools/perf/Documentation/perf-record.txt
View File

@ -313,6 +313,11 @@ OPTIONS
--sample-cpu::
Record the sample cpu.
--sample-identifier::
Record the sample identifier i.e. PERF_SAMPLE_IDENTIFIER bit set in
the sample_type member of the struct perf_event_attr argument to the
perf_event_open system call.
-n::
--no-samples::
Don't sample.

2
tools/perf/builtin-record.c
View File

@ -3191,6 +3191,8 @@ static struct option __record_options[] = {
OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
"Record the sampled code address (ip) page size"),
OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
OPT_BOOLEAN(0, "sample-identifier", &record.opts.sample_identifier,
"Record the sample identifier"),
OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
&record.opts.sample_time_set,
"Record the sample timestamps"),

2
tools/perf/util/record.c
View File

@ -121,7 +121,7 @@ void evlist__config(struct evlist *evlist, struct record_opts *opts, struct call
evlist__for_each_entry(evlist, evsel)
evsel__config_leader_sampling(evsel, evlist);
if (opts->full_auxtrace) {
if (opts->full_auxtrace || opts->sample_identifier) {
/*
* Need to be able to synthesize and parse selected events with
* arbitrary sample types, which requires always being able to

1
tools/perf/util/record.h
View File

@ -28,6 +28,7 @@ struct record_opts {
bool sample_time;
bool sample_time_set;
bool sample_cpu;
bool sample_identifier;
bool period;
bool period_set;
bool running_time;