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Subject[PATCH 1/2] libperf: Add perf_evlist__reset_id_hash()
Date
Add the perf_evlist__reset_id_hash() function to libperf API so that
it can be called to reset the hash table. This is necessary for perf
stat to run the workload multiple times.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/lib/perf/evlist.c | 13 +++++++++----
tools/lib/perf/include/perf/evlist.h | 2 ++
tools/lib/perf/libperf.map | 1 +
3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index 17465d454a0e..a0aaf385cbb5 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -26,13 +26,10 @@

void perf_evlist__init(struct perf_evlist *evlist)
{
- int i;
-
- for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
- INIT_HLIST_HEAD(&evlist->heads[i]);
INIT_LIST_HEAD(&evlist->entries);
evlist->nr_entries = 0;
fdarray__init(&evlist->pollfd, 64);
+ perf_evlist__reset_id_hash(evlist);
}

static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
@@ -237,6 +234,14 @@ static void perf_evlist__id_hash(struct perf_evlist *evlist,
hlist_add_head(&sid->node, &evlist->heads[hash]);
}

+void perf_evlist__reset_id_hash(struct perf_evlist *evlist)
+{
+ int i;
+
+ for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
+ INIT_HLIST_HEAD(&evlist->heads[i]);
+}
+
void perf_evlist__id_add(struct perf_evlist *evlist,
struct perf_evsel *evsel,
int cpu, int thread, u64 id)
diff --git a/tools/lib/perf/include/perf/evlist.h b/tools/lib/perf/include/perf/evlist.h
index 0a7479dc13bf..0085732e8cd9 100644
--- a/tools/lib/perf/include/perf/evlist.h
+++ b/tools/lib/perf/include/perf/evlist.h
@@ -46,4 +46,6 @@ LIBPERF_API struct perf_mmap *perf_evlist__next_mmap(struct perf_evlist *evlist,
(pos) != NULL; \
(pos) = perf_evlist__next_mmap((evlist), (pos), overwrite))

+LIBPERF_API void perf_evlist__reset_id_hash(struct perf_evlist *evlist);
+
#endif /* __LIBPERF_EVLIST_H */
diff --git a/tools/lib/perf/libperf.map b/tools/lib/perf/libperf.map
index 7be1af8a546c..285100143d89 100644
--- a/tools/lib/perf/libperf.map
+++ b/tools/lib/perf/libperf.map
@@ -42,6 +42,7 @@ LIBPERF_0.0.1 {
perf_evlist__munmap;
perf_evlist__filter_pollfd;
perf_evlist__next_mmap;
+ perf_evlist__reset_id_hash;
perf_mmap__consume;
perf_mmap__read_init;
perf_mmap__read_done;
--
2.30.0.617.g56c4b15f3c-goog
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