[PATCH 3/3] libperf tests: Add test_stat_multiplexing test

Shunsuke Nakamura
2021-08-20T09:46:49Z

Adds a test for a counter obtained using read() system call during multiplexing

Committer testing:

$ sudo make tests V=1 -C tools/lib/perf/
make: Entering directory '/home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/lib/perf'
make -f /home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/build/Makefile.build dir=. obj=libperf
make -C /home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/lib/api/ O= libapi.a
make -f /home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/build/Makefile.build dir=./fd obj=libapi
make -f /home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/build/Makefile.build dir=./fs obj=libapi
make -f /home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/build/Makefile.build dir=. obj=tests
make -f /home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/build/Makefile.build dir=./tests obj=tests
running static:
- running tests/test-cpumap.c...OK
- running tests/test-threadmap.c...OK
- running tests/test-evlist.c...
count = 503074578, run = 261416566, enable = 435415718
count = 503295562, run = 261411675, enable = 435412316
count = 501603369, run = 261421312, enable = 435408854
count = 501245546, run = 261419457, enable = 435405029
count = 501849603, run = 261415041, enable = 435400600
count = 500801298, run = 261410125, enable = 435395597
count = 502116997, run = 261401960, enable = 435389539
count = 501797294, run = 261397791, enable = 435382777
count = 501249740, run = 261377402, enable = 435374884
count = 501754502, run = 260985031, enable = 435366109
count = 501659788, run = 260985466, enable = 435354970
count = 503670502, run = 260985172, enable = 435345076
count = 503209138, run = 260987272, enable = 435335863
count = 502772845, run = 260985720, enable = 435314163
count = 504045922, run = 260985324, enable = 435303814
Expected: 502005425
High: 504045922 Low: 500801298 Average: 502276445
Average Error = 0.05%
OK
- running tests/test-evsel.c...
loop = 65536, count = 333260
loop = 131072, count = 655861
loop = 262144, count = 1315513
loop = 524288, count = 2633730
loop = 1048576, count = 5270513
loop = 65536, count = 407118
loop = 131072, count = 786947
loop = 262144, count = 1859532
loop = 524288, count = 3849286
loop = 1048576, count = 7310477
OK
running dynamic:
- running tests/test-cpumap.c...OK
- running tests/test-threadmap.c...OK
- running tests/test-evlist.c...
count = 502071859, run = 275961923, enable = 461897932
count = 501339557, run = 275959274, enable = 461895615
count = 501706307, run = 275912910, enable = 461892367
count = 501877502, run = 275906600, enable = 461888804
count = 501773043, run = 275905934, enable = 461884843
count = 502724983, run = 275884848, enable = 461880027
count = 502436857, run = 276864452, enable = 461874272
count = 502598147, run = 277873765, enable = 461867901
count = 502601952, run = 278872100, enable = 461860271
count = 502356640, run = 278933007, enable = 461851421
count = 503474674, run = 278930678, enable = 461840342
count = 503365623, run = 278976959, enable = 461830886
count = 503307062, run = 278004451, enable = 461821700
count = 502845553, run = 276988055, enable = 461812741
count = 501627390, run = 275995291, enable = 461803691
Expected: 501940978
High: 503474674 Low: 501339557 Average: 502407143
Average Error = 0.09%
OK
- running tests/test-evsel.c...
loop = 65536, count = 328182
loop = 131072, count = 661219
loop = 262144, count = 1316712
loop = 524288, count = 2641030
loop = 1048576, count = 5267395
loop = 65536, count = 393675
loop = 131072, count = 842152
loop = 262144, count = 1664160
loop = 524288, count = 3421570
loop = 1048576, count = 6856783
OK
make: Leaving directory '/home/nakamura/build_work/build_kernel/linux_kernel/linux/tools/lib/perf'

Signed-off-by: Shunsuke Nakamura <nakamura.shun@fujitsu.com>
---
tools/lib/perf/tests/test-evlist.c | 138 +++++++++++++++++++++++++++++
1 file changed, 138 insertions(+)

diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c
index c67c83399170..c7184d8b6ce9 100644
--- a/tools/lib/perf/tests/test-evlist.c
+++ b/tools/lib/perf/tests/test-evlist.c
@@ -21,6 +21,9 @@
#include "tests.h"
#include <internal/evsel.h>

+#define EVENT_NUM 15
+#define WAIT_COUNT 100000000UL
+
static int libperf_print(enum libperf_print_level level,
const char *fmt, va_list ap)
{
@@ -413,6 +416,140 @@ static int test_mmap_cpus(void)
return 0;
}

+static double display_error(long long average,
+ long long high,
+ long long low,
+ long long expected) {
+
+ double error;
+
+ error = (((double)average - expected) / expected) * 100.0;
+
+ __T_VERBOSE(" Expected: %lld\n", expected);
+ __T_VERBOSE(" High: %lld Low: %lld Average: %lld\n",
+ high, low, average);
+
+ __T_VERBOSE(" Average Error = %.2f%%\n",error);
+
+ return error;
+
+}
+
+static int test_stat_multiplexing(void)
+{
+ struct perf_counts_values expected_counts = { .val = 0 };
+ struct perf_counts_values multi_counts[EVENT_NUM] = {{ .val = 0 },};
+ struct perf_thread_map *threads;
+ struct perf_evlist *evlist;
+ struct perf_evsel *evsel;
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_INSTRUCTIONS,
+ .read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
+ PERF_FORMAT_TOTAL_TIME_RUNNING,
+ .disabled = 1,
+ };
+ int err, i, nonzero=0;
+ unsigned long count;
+ long long max = 0, min = 0, avg = 0;
+ double error = 0.0;
+
+ /* read for non-multiplexing event count */
+ threads = perf_thread_map__new_dummy();
+ __T("failed to create threads", threads);
+
+ perf_thread_map__set_pid(threads, 0, 0);
+
+ evsel = perf_evsel__new(&attr);
+ __T("failed to create evsel", evsel);
+
+ err = perf_evsel__open(evsel, NULL, threads);
+ __T("failed to open evsel", err == 0);
+
+ err = perf_evsel__enable(evsel);
+ __T("failed to enable evsel", err == 0);
+
+ count = WAIT_COUNT;
+ while(count--);
+
+ perf_evsel__read(evsel, 0, 0, &expected_counts);
+ __T("failed to read value for evsel", expected_counts.val != 0);
+ __T("failed to read non-multiplexing event count",
+ expected_counts.ena == expected_counts.run);
+
+ err = perf_evsel__disable(evsel);
+ __T("failed to enable evsel", err == 0);
+
+ perf_evsel__close(evsel);
+ perf_evsel__delete(evsel);
+
+ perf_thread_map__put(threads);
+
+
+ /* read for multiplexing event count */
+ threads = perf_thread_map__new_dummy();
+ __T("failed to create threads", threads);
+
+ perf_thread_map__set_pid(threads, 0, 0);
+
+ evlist = perf_evlist__new();
+ __T("failed to create evlist", evlist);
+
+ for (i = 0; i < EVENT_NUM; i++) {
+ evsel = perf_evsel__new(&attr);
+ __T("failed to create evsel1", evsel);
+
+ perf_evlist__add(evlist, evsel);
+ }
+ perf_evlist__set_maps(evlist, NULL, threads);
+
+ err = perf_evlist__open(evlist);
+ __T("failed to open evsel", err == 0);
+
+ perf_evlist__enable(evlist);
+
+ count = WAIT_COUNT;
+ while (count--);
+
+ i = 0;
+ perf_evlist__for_each_evsel(evlist, evsel) {
+ perf_evsel__read(evsel, 0, 0, &multi_counts[i]);
+ __T("failed to read value for evsel", multi_counts[i].val != 0);
+ i++;
+ }
+
+ perf_evlist__disable(evlist);
+
+
+ min = multi_counts[0].val;
+ for (i = 0; i < EVENT_NUM; i++) {
+ __T_VERBOSE("\tcount = %lu, run = %lu, enable = %lu\n",
+ multi_counts[i].val, multi_counts[i].run, multi_counts[i].ena);
+
+ if (multi_counts[i].val > max)
+ max = multi_counts[i].val;
+
+ if (multi_counts[i].val < min)
+ min = multi_counts[i].val;
+
+ avg += multi_counts[i].val;
+
+ if (multi_counts[i].val != 0)
+ nonzero++;
+ }
+ avg = avg / nonzero;
+
+ error = display_error(avg, max, min, expected_counts.val);
+
+ __T("Error out of range!", ((error <= 1.0) && (error >= -1.0)));
+
+ perf_evlist__close(evlist);
+ perf_evlist__delete(evlist);
+
+ perf_thread_map__put(threads);
+ return 0;
+}
+
int test_evlist(int argc, char **argv)
{
__T_START;
@@ -424,6 +561,7 @@ int test_evlist(int argc, char **argv)
test_stat_thread_enable();
test_mmap_thread();
test_mmap_cpus();
+ test_stat_multiplexing();

__T_END;
return tests_failed == 0 ? 0 : -1;
--
2.25.1