![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
The tools so far have been using the strerror_r() GNU variant, that returns a string, be it the buffer passed or something else. But that, besides being tricky in cases where we expect that the function using strerror_r() returns the error formatted in a provided buffer (we have to check if it returned something else and copy that instead), breaks the build on systems not using glibc, like Alpine Linux, where musl libc is used. So, introduce yet another wrapper, str_error_r(), that has the GNU interface, but uses the portable XSI variant of strerror_r(), so that users rest asured that the provided buffer is used and it is what is returned. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-d4t42fnf48ytlk8rjxs822tf@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
236 lines
5.2 KiB
C
236 lines
5.2 KiB
C
#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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str_error_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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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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