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| author | Andi Kleen <ak@linux.intel.com> | 2019-03-27 01:18:21 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-04-01 20:49:24 +0300 |
| commit | f0fbb114e3025f3f737a1e1c5c39c5b2b2e671bd (patch) | |
| tree | 457cc78618f7a4627d37e436d1cef2cbdf9a21d7 /tools/perf/util/parse-events.h | |
| parent | c2b3c170db610896e4e633cba2135045333811c2 (diff) | |
| download | linux-f0fbb114e3025f3f737a1e1c5c39c5b2b2e671bd.tar.xz | |
perf stat: Implement duration_time as a proper event
The perf metric expression use 'duration_time' internally to normalize
events. Normal 'perf stat' without -x also prints the duration time.
But when using -x, the interval is not output anywhere, which is
inconvenient for any post processing which often wants to normalize
values to time.
So implement 'duration_time' as a proper perf event that can be
specified explicitely with -e.
The previous implementation of 'duration_time' only worked for metric
processing. This adds the concept of a tool event that is handled by the
tool. On the kernel level it is still mapped to the dummy software
event, but the values are not read anymore, but instead computed by the
tool.
Add proper plumbing to handle this in the event parser, and display it
in 'perf stat'. We don't want 'duration_time' to be added up, so it's
only printed for the first CPU.
% perf stat -e duration_time,cycles true
Performance counter stats for 'true':
555,476 ns duration_time
771,958 cycles
0.000555476 seconds time elapsed
0.000644000 seconds user
0.000000000 seconds sys
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190326221823.11518-3-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/parse-events.h')
| -rw-r--r-- | tools/perf/util/parse-events.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 5ed035cbcbb7..0c1f5b98f636 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -160,6 +160,10 @@ int parse_events_add_numeric(struct parse_events_state *parse_state, struct list_head *list, u32 type, u64 config, struct list_head *head_config); +enum perf_tool_event; +int parse_events_add_tool(struct parse_events_state *parse_state, + struct list_head *list, + enum perf_tool_event tool_event); int parse_events_add_cache(struct list_head *list, int *idx, char *type, char *op_result1, char *op_result2, struct parse_events_error *error, |