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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/tests/openat-syscall-all-cpus.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tools/perf/tests/openat-syscall-all-cpus.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/tools/perf/tests/openat-syscall-all-cpus.c b/tools/perf/tests/openat-syscall-all-cpus.c new file mode 100644 index 000000000..71f85e2cc --- /dev/null +++ b/tools/perf/tests/openat-syscall-all-cpus.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <errno.h> +#include <inttypes.h> +/* For the CPU_* macros */ +#include <pthread.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <api/fs/fs.h> +#include <linux/err.h> +#include <linux/string.h> +#include <api/fs/tracing_path.h> +#include "evsel.h" +#include "tests.h" +#include "thread_map.h" +#include <perf/cpumap.h> +#include <internal/cpumap.h> +#include "debug.h" +#include "stat.h" +#include "util/counts.h" + +int test__openat_syscall_event_on_all_cpus(struct test *test __maybe_unused, int subtest __maybe_unused) +{ + int err = -1, fd, cpu; + struct perf_cpu_map *cpus; + struct evsel *evsel; + unsigned int nr_openat_calls = 111, i; + cpu_set_t cpu_set; + struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); + char sbuf[STRERR_BUFSIZE]; + char errbuf[BUFSIZ]; + + if (threads == NULL) { + pr_debug("thread_map__new\n"); + return -1; + } + + cpus = perf_cpu_map__new(NULL); + if (cpus == NULL) { + pr_debug("perf_cpu_map__new\n"); + goto out_thread_map_delete; + } + + CPU_ZERO(&cpu_set); + + evsel = evsel__newtp("syscalls", "sys_enter_openat"); + if (IS_ERR(evsel)) { + tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat"); + pr_debug("%s\n", errbuf); + goto out_cpu_map_delete; + } + + if (evsel__open(evsel, cpus, threads) < 0) { + pr_debug("failed to open counter: %s, " + "tweak /proc/sys/kernel/perf_event_paranoid?\n", + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_evsel_delete; + } + + for (cpu = 0; cpu < cpus->nr; ++cpu) { + unsigned int ncalls = nr_openat_calls + cpu; + /* + * XXX eventually lift this restriction in a way that + * keeps perf building on older glibc installations + * without CPU_ALLOC. 1024 cpus in 2010 still seems + * a reasonable upper limit tho :-) + */ + if (cpus->map[cpu] >= CPU_SETSIZE) { + pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); + continue; + } + + CPU_SET(cpus->map[cpu], &cpu_set); + if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { + pr_debug("sched_setaffinity() failed on CPU %d: %s ", + cpus->map[cpu], + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_close_fd; + } + for (i = 0; i < ncalls; ++i) { + fd = openat(0, "/etc/passwd", O_RDONLY); + close(fd); + } + CPU_CLR(cpus->map[cpu], &cpu_set); + } + + /* + * Here we need to explicitly preallocate the counts, as if + * we use the auto allocation it will allocate just for 1 cpu, + * as we start by cpu 0. + */ + if (evsel__alloc_counts(evsel, cpus->nr, 1) < 0) { + pr_debug("evsel__alloc_counts(ncpus=%d)\n", cpus->nr); + goto out_close_fd; + } + + err = 0; + + for (cpu = 0; cpu < cpus->nr; ++cpu) { + unsigned int expected; + + if (cpus->map[cpu] >= CPU_SETSIZE) + continue; + + if (evsel__read_on_cpu(evsel, cpu, 0) < 0) { + pr_debug("evsel__read_on_cpu\n"); + err = -1; + break; + } + + expected = nr_openat_calls + cpu; + if (perf_counts(evsel->counts, cpu, 0)->val != expected) { + pr_debug("evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n", + expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val); + err = -1; + } + } + + evsel__free_counts(evsel); +out_close_fd: + perf_evsel__close_fd(&evsel->core); +out_evsel_delete: + evsel__delete(evsel); +out_cpu_map_delete: + perf_cpu_map__put(cpus); +out_thread_map_delete: + perf_thread_map__put(threads); + return err; +} |