23773ca18b
As tracefs may be mounted instead of debugfs to get to the event directories, have perf know about tracefs, and use that file system over debugfs if it is present. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/20150202193553.340946602@goodmis.org [ Fixed up error messages about tracefs pointed out by Namhyung ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
#include "evsel.h"
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#include "tests.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "debug.h"
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int test__open_syscall_event_on_all_cpus(void)
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{
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int err = -1, fd, cpu;
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struct cpu_map *cpus;
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struct perf_evsel *evsel;
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unsigned int nr_open_calls = 111, i;
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cpu_set_t cpu_set;
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struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
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char sbuf[STRERR_BUFSIZE];
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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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cpus = cpu_map__new(NULL);
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if (cpus == NULL) {
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pr_debug("cpu_map__new\n");
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goto out_thread_map_delete;
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}
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CPU_ZERO(&cpu_set);
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evsel = perf_evsel__newtp("syscalls", "sys_enter_open");
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if (evsel == NULL) {
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if (tracefs_configured())
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pr_debug("is tracefs mounted on /sys/kernel/tracing?\n");
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else if (debugfs_configured())
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pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
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else
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pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
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goto out_thread_map_delete;
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}
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if (perf_evsel__open(evsel, cpus, threads) < 0) {
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pr_debug("failed to open counter: %s, "
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"tweak /proc/sys/kernel/perf_event_paranoid?\n",
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strerror_r(errno, sbuf, sizeof(sbuf)));
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goto out_evsel_delete;
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}
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for (cpu = 0; cpu < cpus->nr; ++cpu) {
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unsigned int ncalls = nr_open_calls + cpu;
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/*
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* XXX eventually lift this restriction in a way that
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* keeps perf building on older glibc installations
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* without CPU_ALLOC. 1024 cpus in 2010 still seems
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* a reasonable upper limit tho :-)
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*/
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if (cpus->map[cpu] >= CPU_SETSIZE) {
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pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
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continue;
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}
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CPU_SET(cpus->map[cpu], &cpu_set);
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if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
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pr_debug("sched_setaffinity() failed on CPU %d: %s ",
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cpus->map[cpu],
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strerror_r(errno, sbuf, sizeof(sbuf)));
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goto out_close_fd;
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}
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for (i = 0; i < ncalls; ++i) {
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fd = open("/etc/passwd", O_RDONLY);
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close(fd);
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}
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CPU_CLR(cpus->map[cpu], &cpu_set);
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}
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/*
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* Here we need to explicitely preallocate the counts, as if
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* we use the auto allocation it will allocate just for 1 cpu,
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* as we start by cpu 0.
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*/
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if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
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pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
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goto out_close_fd;
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}
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err = 0;
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for (cpu = 0; cpu < cpus->nr; ++cpu) {
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unsigned int expected;
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if (cpus->map[cpu] >= CPU_SETSIZE)
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continue;
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if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
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pr_debug("perf_evsel__read_on_cpu\n");
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err = -1;
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break;
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}
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expected = nr_open_calls + cpu;
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if (evsel->counts->cpu[cpu].val != expected) {
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pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
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expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
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err = -1;
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}
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}
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perf_evsel__free_counts(evsel);
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out_close_fd:
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perf_evsel__close_fd(evsel, 1, threads->nr);
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out_evsel_delete:
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perf_evsel__delete(evsel);
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out_thread_map_delete:
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thread_map__delete(threads);
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return err;
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}
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