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| author | Jin Yao <yao.jin@linux.intel.com> | 2020-05-20 07:27:36 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-05-28 16:03:27 +0300 |
| commit | 905365f493e3469dc0dfea459a3beb34129357e8 (patch) | |
| tree | 2d7255ddff06a01badd3ecfd6971dbe62ac217da /tools/perf/util/stat.c | |
| parent | 297767ac0ce598dece202e5c9e3f22e034cb4821 (diff) | |
| download | linux-905365f493e3469dc0dfea459a3beb34129357e8.tar.xz | |
perf stat: Save aggr value to first member of prev_raw_counts
To collect the overall statistics for interval mode, we copy the counts
from evsel->prev_raw_counts to evsel->counts.
For AGGR_GLOBAL mode, because the perf_stat_process_counter creates aggr
values from per cpu values, but the per cpu values are 0, so the
calculated aggr values will be always 0.
This patch uses a trick that saves the previous aggr value to the first
member of perf_counts, then aggr calculation in process_counter_values
can work correctly for AGGR_GLOBAL.
v6:
---
Add comments in perf_evlist__save_aggr_prev_raw_counts.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200520042737.24160-5-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/stat.c')
| -rw-r--r-- | tools/perf/util/stat.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c index aadc723ce871..d23109c9bee9 100644 --- a/tools/perf/util/stat.c +++ b/tools/perf/util/stat.c @@ -249,6 +249,26 @@ void perf_evlist__copy_prev_raw_counts(struct evlist *evlist) perf_evsel__copy_prev_raw_counts(evsel); } +void perf_evlist__save_aggr_prev_raw_counts(struct evlist *evlist) +{ + struct evsel *evsel; + + /* + * To collect the overall statistics for interval mode, + * we copy the counts from evsel->prev_raw_counts to + * evsel->counts. The perf_stat_process_counter creates + * aggr values from per cpu values, but the per cpu values + * are 0 for AGGR_GLOBAL. So we use a trick that saves the + * previous aggr value to the first member of perf_counts, + * then aggr calculation in process_counter_values can work + * correctly. + */ + evlist__for_each_entry(evlist, evsel) { + *perf_counts(evsel->prev_raw_counts, 0, 0) = + evsel->prev_raw_counts->aggr; + } +} + static void zero_per_pkg(struct evsel *counter) { if (counter->per_pkg_mask) |