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| author | Adrian Hunter <[email protected]> | 2019-08-12 09:09:35 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <[email protected]> | 2019-08-20 15:17:45 +0000 |
| commit | 3c84e65a533dbaa1a29bfd847deca73704b675eb (patch) | |
| tree | feb43acb32e8cdd53b5737c0d9b79fc7b04a0d26 | |
| parent | tools arch x86: Sync asm/cpufeatures.h with the with the kernel (diff) | |
| download | kernel-3c84e65a533dbaa1a29bfd847deca73704b675eb.tar.gz kernel-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 <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
| -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; |