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| author | Adrian Hunter <adrian.hunter@intel.com> | 2019-08-12 12:09:35 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-08-20 12:17:45 -0300 |
| commit | 3c84e65a533dbaa1a29bfd847deca73704b675eb (patch) | |
| tree | feb43acb32e8cdd53b5737c0d9b79fc7b04a0d26 /tools/perf/util/evsel.h | |
| parent | 0ac10d87a571ae7d68c7f70f1c2229388f1dce9e (diff) | |
| download | linux-stable-3c84e65a533dbaa1a29bfd847deca73704b675eb.tar.gz linux-stable-3c84e65a533dbaa1a29bfd847deca73704b675eb.tar.bz2 linux-stable-3c84e65a533dbaa1a29bfd847deca73704b675eb.zip | |
perf evsel: Add comment for 'idx' member in 'struct perf_sample_id
The 'idx' member was added as preparation for AUX area sampling. Add a
comment to describe why.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/83ff264f-84c3-5372-8976-dd9293d20c6f@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.h')
| -rw-r--r-- | tools/perf/util/evsel.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index 9cd6e3ae479a..efe08065838f 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -23,6 +23,13 @@ struct perf_sample_id { struct hlist_node node; u64 id; struct evsel *evsel; + /* + * 'idx' will be used for AUX area sampling. A sample will have AUX area + * data that will be queued for decoding, where there are separate + * queues for each CPU (per-cpu tracing) or task (per-thread tracing). + * The sample ID can be used to lookup 'idx' which is effectively the + * queue number. + */ int idx; int cpu; pid_t tid; |