[PATCH v2 2/2] libperf tests: Add test_stat_multiplexing test

Shunsuke Nakamura
2021-09-22T10:16:51Z

From: nakamura shunsuke <nakamura.shun@fujitsu.com>

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

Committer testing:

$ sudo make tests -C tools/lib/perf/ V=1
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 = 502273264, run = 264105562, enable = 444092845
count = 501850699, run = 264100505, enable = 444088400
count = 499613780, run = 264096660, enable = 444085073
count = 499569398, run = 264501528, enable = 444081268
count = 500717228, run = 265495387, enable = 444077029
count = 501260539, run = 266488226, enable = 444071569
count = 501023910, run = 267469613, enable = 444065303
count = 501188267, run = 268461294, enable = 444058413
count = 503096683, run = 269450511, enable = 444050567
count = 503141904, run = 269587790, enable = 444041735
count = 503454490, run = 268590361, enable = 444030544
count = 504838207, run = 267592624, enable = 444021005
count = 505458594, run = 266594648, enable = 444001280
count = 504269433, run = 265595795, enable = 443991377
count = 502625858, run = 264599374, enable = 443982141
Expected: 502065774
High: 505458594 Low: 499569398 Average: 502292150
Average Error = 0.05%
count = 26129, run = 134550, enable = 134550
count = 34035, run = 140540, enable = 140540
count = 40189, run = 141126, enable = 141126
count = 45263, run = 138290, enable = 138290
count = 51381, run = 136966, enable = 136966
count = 57499, run = 134993, enable = 134993
count = 63617, run = 132320, enable = 132320
count = 71714, run = 132047, enable = 132047
count = 77832, run = 128157, enable = 128157
count = 0, run = 0, enable = 123662
count = 0, run = 0, enable = 116753
count = 0, run = 0, enable = 110304
count = 0, run = 0, enable = 103834
count = 0, run = 0, enable = 97465
count = 0, run = 0, enable = 91110
OK
- running tests/test-evsel.c...
loop = 65536, count = 334303
loop = 131072, count = 656954
loop = 262144, count = 1321090
loop = 524288, count = 2652616
loop = 1048576, count = 5262140
loop = 65536, count = 393726
loop = 131072, count = 989345
loop = 262144, count = 1986206
loop = 524288, count = 3831652
loop = 1048576, count = 7747957
OK
running dynamic:
- running tests/test-cpumap.c...OK
- running tests/test-threadmap.c...OK
- running tests/test-evlist.c...
count = 501975838, run = 247092568, enable = 415093723
count = 502491858, run = 247087145, enable = 415088830
count = 502571026, run = 247083574, enable = 415085139
count = 502743767, run = 247080183, enable = 415081197
count = 503259008, run = 247779561, enable = 415076990
count = 503169622, run = 248773141, enable = 415072091
count = 503430373, run = 249816445, enable = 415066529
count = 502597951, run = 250808797, enable = 415059863
count = 502211776, run = 251799199, enable = 415051831
count = 501921896, run = 252000721, enable = 415042717
count = 501441904, run = 251309399, enable = 415031152
count = 501224474, run = 250311107, enable = 415021479
count = 500502827, run = 249260579, enable = 415012168
count = 500775622, run = 248259621, enable = 415002830
count = 501377375, run = 247261134, enable = 414993890
Expected: 501953755
High: 503430373 Low: 500502827 Average: 502113021
Average Error = 0.03%
count = 26098, run = 131826, enable = 131826
count = 33689, run = 138284, enable = 138284
count = 39808, run = 139152, enable = 139152
count = 45927, run = 138880, enable = 138880
count = 51049, run = 135405, enable = 135405
count = 57168, run = 133406, enable = 133406
count = 63287, run = 130736, enable = 130736
count = 71392, run = 130474, enable = 130474
count = 77794, run = 127203, enable = 127203
count = 0, run = 0, enable = 123172
count = 0, run = 0, enable = 116856
count = 0, run = 0, enable = 110557
count = 0, run = 0, enable = 104282
count = 0, run = 0, enable = 97929
count = 0, run = 0, enable = 91792
OK
- running tests/test-evsel.c...
loop = 65536, count = 334400
loop = 131072, count = 656908
loop = 262144, count = 1315441
loop = 524288, count = 2657481
loop = 1048576, count = 5258193
loop = 65536, count = 491938
loop = 131072, count = 965755
loop = 262144, count = 1666277
loop = 524288, count = 3516123
loop = 1048576, count = 6759204
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 | 183 +++++++++++++++++++++++++++++
1 file changed, 183 insertions(+)

diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c
index c67c83399170..ca7a9542f40e 100644
--- a/tools/lib/perf/tests/test-evlist.c
+++ b/tools/lib/perf/tests/test-evlist.c
@@ -21,6 +21,10 @@
#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 +417,184 @@ 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 multiplexing_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);
+
+ /* wait loop */
+ 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);
+
+ /* wait loop */
+ count = WAIT_COUNT;
+ while(count--);
+
+ i = 0;
+ perf_evlist__for_each_evsel(evlist, evsel) {
+ perf_evsel__read(evsel, 0, 0, &multiplexing_counts[i]);
+ __T("failed to read value for evsel", multiplexing_counts[i].val != 0);
+ i++;
+ }
+
+ perf_evlist__disable(evlist);
+
+
+ min = multiplexing_counts[0].val;
+ for (i = 0; i < EVENT_NUM; i++) {
+ __T_VERBOSE("\tcount = %lu, run = %lu, enable = %lu\n",
+ multiplexing_counts[i].val, multiplexing_counts[i].run,
+ multiplexing_counts[i].ena);
+
+ if (multiplexing_counts[i].val > max)
+ max = multiplexing_counts[i].val;
+
+ if (multiplexing_counts[i].val < min)
+ min = multiplexing_counts[i].val;
+
+ avg += multiplexing_counts[i].val;
+
+ if (multiplexing_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);
+
+
+ /* Verify that no division by zero occurs */
+ 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);
+
+ /* Reproduce run=0 by not executing wait loop. */
+
+ i = 0;
+ perf_evlist__for_each_evsel(evlist, evsel) {
+ perf_evsel__read(evsel, 0, 0, &multiplexing_counts[i]);
+ __T_VERBOSE("\tcount = %lu, run = %lu, enable = %lu\n",
+ multiplexing_counts[i].val, multiplexing_counts[i].run,
+ multiplexing_counts[i].ena);
+ i++;
+ }
+
+ 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 +606,7 @@ 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;
--
2.27.0