lkml.org 
[lkml]   [2022]   [Aug]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] tools lib perf: Add a test case for read formats
Date
It checks a various combination of the read format settings and verify
it return the value in a proper position. The test uses task-clock
software events to guarantee it's always active and sets enabled/running
time.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/lib/perf/tests/test-evsel.c | 161 ++++++++++++++++++++++++++++++
1 file changed, 161 insertions(+)

diff --git a/tools/lib/perf/tests/test-evsel.c b/tools/lib/perf/tests/test-evsel.c
index 89be89afb24d..a11fc51bfb68 100644
--- a/tools/lib/perf/tests/test-evsel.c
+++ b/tools/lib/perf/tests/test-evsel.c
@@ -1,10 +1,13 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdarg.h>
#include <stdio.h>
+#include <string.h>
#include <linux/perf_event.h>
+#include <linux/kernel.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <perf/evsel.h>
+#include <internal/evsel.h>
#include <internal/tests.h>
#include "tests.h"

@@ -189,6 +192,163 @@ static int test_stat_user_read(int event)
return 0;
}

+static int test_stat_read_format_single(struct perf_event_attr *attr, struct perf_thread_map *threads)
+{
+ struct perf_evsel *evsel;
+ struct perf_counts_values counts;
+ volatile int count = 0x100000;
+ int err;
+
+ evsel = perf_evsel__new(attr);
+ __T("failed to create evsel", evsel);
+
+ /* skip old kernels that don't support the format */
+ err = perf_evsel__open(evsel, NULL, threads);
+ if (err < 0)
+ return 0;
+
+ while (count--) ;
+
+ memset(&counts, -1, sizeof(counts));
+ perf_evsel__read(evsel, 0, 0, &counts);
+
+ __T("failed to read value", counts.val);
+ if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ __T("failed to read TOTAL_TIME_ENABLED", counts.ena);
+ if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ __T("failed to read TOTAL_TIME_RUNNING", counts.run);
+ if (attr->read_format & PERF_FORMAT_ID)
+ __T("failed to read ID", counts.id);
+ if (attr->read_format & PERF_FORMAT_LOST)
+ __T("failed to read LOST", counts.lost == 0);
+
+ perf_evsel__close(evsel);
+ perf_evsel__delete(evsel);
+ return 0;
+}
+
+static int test_stat_read_format_group(struct perf_event_attr *attr, struct perf_thread_map *threads)
+{
+ struct perf_evsel *leader, *member;
+ struct perf_counts_values counts;
+ volatile int count = 0x100000;
+ int err;
+
+ attr->read_format |= PERF_FORMAT_GROUP;
+ leader = perf_evsel__new(attr);
+ __T("failed to create leader", leader);
+
+ attr->read_format &= ~PERF_FORMAT_GROUP;
+ member = perf_evsel__new(attr);
+ __T("failed to create member", member);
+
+ member->leader = leader;
+ leader->nr_members = 2;
+
+ /* skip old kernels that don't support the format */
+ err = perf_evsel__open(leader, NULL, threads);
+ if (err < 0)
+ return 0;
+ err = perf_evsel__open(member, NULL, threads);
+ if (err < 0)
+ return 0;
+
+ while (count--) ;
+
+ memset(&counts, -1, sizeof(counts));
+ perf_evsel__read(leader, 0, 0, &counts);
+
+ __T("failed to read leader value", counts.val);
+ if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ __T("failed to read leader TOTAL_TIME_ENABLED", counts.ena);
+ if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ __T("failed to read leader TOTAL_TIME_RUNNING", counts.run);
+ if (attr->read_format & PERF_FORMAT_ID)
+ __T("failed to read leader ID", counts.id);
+ if (attr->read_format & PERF_FORMAT_LOST)
+ __T("failed to read leader LOST", counts.lost == 0);
+
+ memset(&counts, -1, sizeof(counts));
+ perf_evsel__read(member, 0, 0, &counts);
+
+ __T("failed to read member value", counts.val);
+ if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ __T("failed to read member TOTAL_TIME_ENABLED", counts.ena);
+ if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ __T("failed to read member TOTAL_TIME_RUNNING", counts.run);
+ if (attr->read_format & PERF_FORMAT_ID)
+ __T("failed to read member ID", counts.id);
+ if (attr->read_format & PERF_FORMAT_LOST)
+ __T("failed to read member LOST", counts.lost == 0);
+
+ perf_evsel__close(member);
+ perf_evsel__close(leader);
+ perf_evsel__delete(member);
+ perf_evsel__delete(leader);
+ return 0;
+}
+
+static int test_stat_read_format(void)
+{
+ struct perf_thread_map *threads;
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_TASK_CLOCK,
+ };
+ int err, i;
+
+#define FMT(_fmt) PERF_FORMAT_ ## _fmt
+#define FMT_TIME (FMT(TOTAL_TIME_ENABLED) | FMT(TOTAL_TIME_RUNNING))
+
+ uint64_t test_formats [] = {
+ 0,
+ FMT_TIME,
+ FMT(ID),
+ FMT(LOST),
+ FMT_TIME | FMT(ID),
+ FMT_TIME | FMT(LOST),
+ FMT_TIME | FMT(ID) | FMT(LOST),
+ FMT(ID) | FMT(LOST),
+ };
+
+#undef FMT
+#undef FMT_TIME
+
+ threads = perf_thread_map__new_dummy();
+ __T("failed to create threads", threads);
+
+ perf_thread_map__set_pid(threads, 0, 0);
+
+ for (i = 0; i < (int)ARRAY_SIZE(test_formats); i++) {
+ attr.read_format = test_formats[i];
+ __T_VERBOSE("testing single read with read_format: %lx\n",
+ (unsigned long)test_formats[i]);
+
+ err = test_stat_read_format_single(&attr, threads);
+ __T("failed to read single format", err == 0);
+ }
+
+ perf_thread_map__put(threads);
+
+ threads = perf_thread_map__new_array(2, NULL);
+ __T("failed to create threads", threads);
+
+ perf_thread_map__set_pid(threads, 0, 0);
+ perf_thread_map__set_pid(threads, 1, 0);
+
+ for (i = 0; i < (int)ARRAY_SIZE(test_formats); i++) {
+ attr.read_format = test_formats[i];
+ __T_VERBOSE("testing group read with read_format: %lx\n",
+ (unsigned long)test_formats[i]);
+
+ err = test_stat_read_format_group(&attr, threads);
+ __T("failed to read group format", err == 0);
+ }
+
+ perf_thread_map__put(threads);
+ return 0;
+}
+
int test_evsel(int argc, char **argv)
{
__T_START;
@@ -200,6 +360,7 @@ int test_evsel(int argc, char **argv)
test_stat_thread_enable();
test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);
test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);
+ test_stat_read_format();

__T_END;
return tests_failed == 0 ? 0 : -1;
--
2.37.1.595.g718a3a8f04-goog
\
 
 \ /
  Last update: 2022-08-17 00:18    [W:0.080 / U:1.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site