The following commit has been merged into the perf/core branch of tip:
Commit-ID: 76ce02651dabee19df018097db4485800e05e177
Gitweb: https://git.kernel.org/tip/76ce02651dabee19df018097db4485800e05e177
Author: Michael Petlan <mpetlan@xxxxxxxxxx>
AuthorDate: Thu, 27 Feb 2020 20:44:24 +01:00
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Wed, 04 Mar 2020 10:34:10 -03:00
libperf: Add counting example
Current libperf man pages mention file counting.c "coming with libperf package",
however, the file is missing. Add the file then.
Fixes: 81de3bf37a8b ("libperf: Add man pages")
Signed-off-by: Michael Petlan <mpetlan@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
LPU-Reference: 20200227194424.28210-1-mpetlan@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/lib/perf/Documentation/examples/counting.c | 83 +++++++++++++++-
1 file changed, 83 insertions(+)
create mode 100644 tools/lib/perf/Documentation/examples/counting.c
diff --git a/tools/lib/perf/Documentation/examples/counting.c b/tools/lib/perf/Documentation/examples/counting.c
new file mode 100644
index 0000000..6085693
--- /dev/null
+++ b/tools/lib/perf/Documentation/examples/counting.c
@@ -0,0 +1,83 @@
+#include <linux/perf_event.h>
+#include <perf/evlist.h>
+#include <perf/evsel.h>
+#include <perf/cpumap.h>
+#include <perf/threadmap.h>
+#include <perf/mmap.h>
+#include <perf/core.h>
+#include <perf/event.h>
+#include <stdio.h>
+#include <unistd.h>
+
+static int libperf_print(enum libperf_print_level level,
+ const char *fmt, va_list ap)
+{
+ return vfprintf(stderr, fmt, ap);
+}
+
+int main(int argc, char **argv)
+{
+ int count = 100000, err = 0;
+ struct perf_evlist *evlist;
+ struct perf_evsel *evsel;
+ struct perf_thread_map *threads;
+ struct perf_counts_values counts;
+
+ struct perf_event_attr attr1 = {
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_CPU_CLOCK,
+ .read_format = PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_TOTAL_TIME_RUNNING,
+ .disabled = 1,
+ };
+ struct perf_event_attr attr2 = {
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_TASK_CLOCK,
+ .read_format = PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_TOTAL_TIME_RUNNING,
+ .disabled = 1,
+ };
+
+ libperf_init(libperf_print);
+ threads = perf_thread_map__new_dummy();
+ if (!threads) {
+ fprintf(stderr, "failed to create threads\n");
+ return -1;
+ }
+ perf_thread_map__set_pid(threads, 0, 0);
+ evlist = perf_evlist__new();
+ if (!evlist) {
+ fprintf(stderr, "failed to create evlist\n");
+ goto out_threads;
+ }
+ evsel = perf_evsel__new(&attr1);
+ if (!evsel) {
+ fprintf(stderr, "failed to create evsel1\n");
+ goto out_evlist;
+ }
+ perf_evlist__add(evlist, evsel);
+ evsel = perf_evsel__new(&attr2);
+ if (!evsel) {
+ fprintf(stderr, "failed to create evsel2\n");
+ goto out_evlist;
+ }
+ perf_evlist__add(evlist, evsel);
+ perf_evlist__set_maps(evlist, NULL, threads);
+ err = perf_evlist__open(evlist);
+ if (err) {
+ fprintf(stderr, "failed to open evsel\n");
+ goto out_evlist;
+ }
+ perf_evlist__enable(evlist);
+ while (count--);
+ perf_evlist__disable(evlist);
+ perf_evlist__for_each_evsel(evlist, evsel) {
+ perf_evsel__read(evsel, 0, 0, &counts);
+ fprintf(stdout, "count %llu, enabled %llu, run %llu\n",
+ counts.val, counts.ena, counts.run);
+ }
+ perf_evlist__close(evlist);
+out_evlist:
+ perf_evlist__delete(evlist);
+out_threads:
+ perf_thread_map__put(threads);
+ return err;
+}
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