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perf record: Add support for AUX area sampling

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Add a 'perf record' option '--aux-sample' to request AUX area sampling.
AUX area sampling uses an overwriting buffer much like snapshot mode, so
adjust the AUX buffer mmapping accordingly. To make it easy to queue
samples for decoding, synthesize an ID index.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191115124225.5247-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-11-15 14:42:16 +02:00 committed by Arnaldo Carvalho de Melo
parent f0bb7ee853
commit c0a6de06c4
2 changed files with 26 additions and 1 deletions
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6
tools/perf/Documentation/perf-record.txt
View file

@ -433,6 +433,12 @@ can be specified in a string that follows this option:
In Snapshot Mode trace data is captured only when signal SIGUSR2 is received
and on exit if the above 'e' option is given.
--aux-sample[=OPTIONS]::
Select AUX area sampling. At least one of the events selected by the -e option
must be an AUX area event. Samples on other events will be created containing
data from the AUX area. Optionally sample size may be specified, otherwise it
defaults to 4KiB.
--proc-map-timeout::
When processing pre-existing threads /proc/XXX/mmap, it may take a long time,
because the file may be huge. A time out is needed in such cases.

21
tools/perf/builtin-record.c
View file

@ -680,6 +680,11 @@ static int record__auxtrace_init(struct record *rec)
if (err)
return err;
err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
rec->opts.auxtrace_sample_opts);
if (err)
return err;
return auxtrace_parse_filters(rec->evlist);
}
@ -752,6 +757,8 @@ static int record__mmap_evlist(struct record *rec,
struct evlist *evlist)
{
struct record_opts *opts = &rec->opts;
bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
opts->auxtrace_sample_mode;
char msg[512];
if (opts->affinity != PERF_AFFINITY_SYS)
@ -759,7 +766,7 @@ static int record__mmap_evlist(struct record *rec,
if (evlist__mmap_ex(evlist, opts->mmap_pages,
opts->auxtrace_mmap_pages,
opts->auxtrace_snapshot_mode,
auxtrace_overwrite,
opts->nr_cblocks, opts->affinity,
opts->mmap_flush, opts->comp_level) < 0) {
if (errno == EPERM) {
@ -1046,6 +1053,7 @@ static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
}
if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
!rec->opts.auxtrace_sample_mode &&
record__auxtrace_mmap_read(rec, map) != 0) {
rc = -1;
goto out;
@ -1321,6 +1329,15 @@ static int record__synthesize(struct record *rec, bool tail)
if (err)
goto out;
/* Synthesize id_index before auxtrace_info */
if (rec->opts.auxtrace_sample_mode) {
err = perf_event__synthesize_id_index(tool,
process_synthesized_event,
session->evlist, machine);
if (err)
goto out;
}
if (rec->opts.full_auxtrace) {
err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
session, process_synthesized_event);
@ -2329,6 +2346,8 @@ static struct option __record_options[] = {
parse_clockid),
OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
"opts", "AUX area tracing Snapshot Mode", ""),
OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
"opts", "sample AUX area", ""),
OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,