perf tests: Add test to check for event times
This test creates software event 'cpu-clock' attaches it in several ways and checks that enabled and running times match. Committer notes: Testing it: [acme@jouet linux]$ perf test -v times 44: Test events times : --- start --- test child forked, pid 27170 attaching to spawned child, enable on exec OK : ena 307328, run 307328 attaching to current thread as enabled OK : ena 7826, run 7826 attaching to current thread as disabled OK : ena 738, run 738 attaching to CPU 0 as enabled SKIP : not enough rights attaching to CPU 0 as enabled SKIP : not enough rights test child finished with -2 ---- end ---- Test events times: Skip [acme@jouet linux]$ [root@jouet ~]# perf test times 44: Test events times : Ok [root@jouet ~]# perf test -v times 44: Test events times : --- start --- test child forked, pid 27306 attaching to spawned child, enable on exec OK : ena 479290, run 479290 attaching to current thread as enabled OK : ena 11356, run 11356 attaching to current thread as disabled OK : ena 987, run 987 attaching to CPU 0 as enabled OK : ena 3717, run 3717 attaching to CPU 0 as enabled OK : ena 2323, run 2323 test child finished with 0 ---- end ---- Test events times: Ok [root@jouet ~]# Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1458823940-24583-7-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
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e0be62cc03
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@ -37,6 +37,7 @@ perf-y += topology.o
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perf-y += cpumap.o
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perf-y += stat.o
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perf-y += event_update.o
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perf-y += event-times.o
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$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
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$(call rule_mkdir)
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@ -203,6 +203,10 @@ static struct test generic_tests[] = {
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.desc = "Test attr update synthesize",
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.func = test__event_update,
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},
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{
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.desc = "Test events times",
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.func = test__event_times,
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},
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{
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.func = NULL,
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},
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236
tools/perf/tests/event-times.c
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236
tools/perf/tests/event-times.c
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@ -0,0 +1,236 @@
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#include <linux/compiler.h>
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#include <string.h>
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#include "tests.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "util.h"
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#include "debug.h"
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#include "thread_map.h"
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#include "target.h"
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static int attach__enable_on_exec(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evlist__last(evlist);
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struct target target = {
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.uid = UINT_MAX,
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};
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const char *argv[] = { "true", NULL, };
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char sbuf[STRERR_BUFSIZE];
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int err;
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pr_debug("attaching to spawned child, enable on exec\n");
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err = perf_evlist__create_maps(evlist, &target);
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if (err < 0) {
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pr_debug("Not enough memory to create thread/cpu maps\n");
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return err;
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}
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err = perf_evlist__prepare_workload(evlist, &target, argv, false, NULL);
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if (err < 0) {
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pr_debug("Couldn't run the workload!\n");
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return err;
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}
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evsel->attr.enable_on_exec = 1;
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err = perf_evlist__open(evlist);
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if (err < 0) {
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pr_debug("perf_evlist__open: %s\n",
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strerror_r(errno, sbuf, sizeof(sbuf)));
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return err;
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}
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return perf_evlist__start_workload(evlist) == 1 ? TEST_OK : TEST_FAIL;
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}
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static int detach__enable_on_exec(struct perf_evlist *evlist)
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{
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waitpid(evlist->workload.pid, NULL, 0);
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return 0;
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}
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static int attach__current_disabled(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evlist__last(evlist);
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struct thread_map *threads;
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int err;
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pr_debug("attaching to current thread as disabled\n");
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threads = thread_map__new(-1, getpid(), UINT_MAX);
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if (threads == NULL) {
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pr_debug("thread_map__new\n");
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return -1;
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}
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evsel->attr.disabled = 1;
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err = perf_evsel__open_per_thread(evsel, threads);
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if (err) {
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pr_debug("Failed to open event cpu-clock:u\n");
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return err;
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}
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thread_map__put(threads);
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return perf_evsel__enable(evsel) == 0 ? TEST_OK : TEST_FAIL;
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}
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static int attach__current_enabled(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evlist__last(evlist);
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struct thread_map *threads;
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int err;
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pr_debug("attaching to current thread as enabled\n");
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threads = thread_map__new(-1, getpid(), UINT_MAX);
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if (threads == NULL) {
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pr_debug("failed to call thread_map__new\n");
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return -1;
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}
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err = perf_evsel__open_per_thread(evsel, threads);
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thread_map__put(threads);
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return err == 0 ? TEST_OK : TEST_FAIL;
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}
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static int detach__disable(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evlist__last(evlist);
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return perf_evsel__enable(evsel);
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}
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static int attach__cpu_disabled(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evlist__last(evlist);
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struct cpu_map *cpus;
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int err;
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pr_debug("attaching to CPU 0 as enabled\n");
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cpus = cpu_map__new("0");
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if (cpus == NULL) {
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pr_debug("failed to call cpu_map__new\n");
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return -1;
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}
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evsel->attr.disabled = 1;
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err = perf_evsel__open_per_cpu(evsel, cpus);
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if (err) {
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if (err == -EACCES)
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return TEST_SKIP;
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pr_debug("Failed to open event cpu-clock:u\n");
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return err;
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}
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cpu_map__put(cpus);
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return perf_evsel__enable(evsel);
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}
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static int attach__cpu_enabled(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel = perf_evlist__last(evlist);
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struct cpu_map *cpus;
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int err;
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pr_debug("attaching to CPU 0 as enabled\n");
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cpus = cpu_map__new("0");
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if (cpus == NULL) {
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pr_debug("failed to call cpu_map__new\n");
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return -1;
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}
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err = perf_evsel__open_per_cpu(evsel, cpus);
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if (err == -EACCES)
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return TEST_SKIP;
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cpu_map__put(cpus);
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return err ? TEST_FAIL : TEST_OK;
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}
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static int test_times(int (attach)(struct perf_evlist *),
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int (detach)(struct perf_evlist *))
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{
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struct perf_counts_values count;
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struct perf_evlist *evlist = NULL;
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struct perf_evsel *evsel;
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int err = -1, i;
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evlist = perf_evlist__new();
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if (!evlist) {
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pr_debug("failed to create event list\n");
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goto out_err;
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}
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err = parse_events(evlist, "cpu-clock:u", NULL);
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if (err) {
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pr_debug("failed to parse event cpu-clock:u\n");
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goto out_err;
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}
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evsel = perf_evlist__last(evlist);
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evsel->attr.read_format |=
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PERF_FORMAT_TOTAL_TIME_ENABLED |
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PERF_FORMAT_TOTAL_TIME_RUNNING;
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err = attach(evlist);
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if (err == TEST_SKIP) {
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pr_debug(" SKIP : not enough rights\n");
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return err;
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}
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TEST_ASSERT_VAL("failed to attach", !err);
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for (i = 0; i < 100000000; i++) { }
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TEST_ASSERT_VAL("failed to detach", !detach(evlist));
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perf_evsel__read(evsel, 0, 0, &count);
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err = !(count.ena == count.run);
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pr_debug(" %s: ena %" PRIu64", run %" PRIu64"\n",
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!err ? "OK " : "FAILED",
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count.ena, count.run);
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out_err:
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if (evlist)
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perf_evlist__delete(evlist);
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return !err ? TEST_OK : TEST_FAIL;
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}
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/*
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* This test creates software event 'cpu-clock'
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* attaches it in several ways (explained below)
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* and checks that enabled and running times
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* match.
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*/
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int test__event_times(int subtest __maybe_unused)
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{
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int err, ret = 0;
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#define _T(attach, detach) \
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err = test_times(attach, detach); \
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if (err && (ret == TEST_OK || ret == TEST_SKIP)) \
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ret = err;
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/* attach on newly spawned process after exec */
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_T(attach__enable_on_exec, detach__enable_on_exec)
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/* attach on current process as enabled */
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_T(attach__current_enabled, detach__disable)
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/* attach on current process as disabled */
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_T(attach__current_disabled, detach__disable)
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/* attach on cpu as disabled */
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_T(attach__cpu_disabled, detach__disable)
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/* attach on cpu as enabled */
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_T(attach__cpu_enabled, detach__disable)
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#undef _T
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return ret;
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}
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@ -85,6 +85,7 @@ int test__synthesize_stat_config(int subtest);
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int test__synthesize_stat(int subtest);
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int test__synthesize_stat_round(int subtest);
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int test__event_update(int subtest);
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int test__event_times(int subtest);
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#if defined(__arm__) || defined(__aarch64__)
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#ifdef HAVE_DWARF_UNWIND_SUPPORT
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