perf test: Add test for the evlist mmap routines
This test will generate random numbers of calls to some getpid syscalls, then establish an mmap for a group of events that are created to monitor these syscalls. It will receive the events, using mmap, use its PERF_SAMPLE_ID generated sample.id field to map back to its respective perf_evsel instance. Then it checks if the number of syscalls reported as perf events by the kernel corresponds to the number of syscalls made. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
04391debc3
commit
de5fa3a8a0
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@ -7,7 +7,9 @@
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/evlist.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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#include "util/session.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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@ -238,14 +240,14 @@ out:
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#include "util/evsel.h"
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#include <sys/types.h>
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static int trace_event__id(const char *event_name)
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static int trace_event__id(const char *evname)
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{
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char *filename;
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int err = -1, fd;
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if (asprintf(&filename,
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"/sys/kernel/debug/tracing/events/syscalls/%s/id",
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event_name) < 0)
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evname) < 0)
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return -1;
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fd = open(filename, O_RDONLY);
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@ -439,6 +441,167 @@ out_thread_map_delete:
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return err;
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}
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/*
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* This test will generate random numbers of calls to some getpid syscalls,
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* then establish an mmap for a group of events that are created to monitor
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* the syscalls.
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*
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* It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
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* sample.id field to map back to its respective perf_evsel instance.
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*
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* Then it checks if the number of syscalls reported as perf events by
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* the kernel corresponds to the number of syscalls made.
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*/
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static int test__basic_mmap(void)
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{
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int err = -1;
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event_t *event;
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struct thread_map *threads;
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struct perf_session session;
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struct cpu_map *cpus;
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struct perf_evlist *evlist;
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struct perf_event_attr attr = {
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.type = PERF_TYPE_TRACEPOINT,
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.read_format = PERF_FORMAT_ID,
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.sample_type = PERF_SAMPLE_ID,
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.watermark = 0,
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};
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cpu_set_t cpu_set;
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const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
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"getpgid", };
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pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
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(void*)getpgid };
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#define nsyscalls ARRAY_SIZE(syscall_names)
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int ids[nsyscalls];
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unsigned int nr_events[nsyscalls],
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expected_nr_events[nsyscalls], i, j;
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struct perf_evsel *evsels[nsyscalls], *evsel;
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for (i = 0; i < nsyscalls; ++i) {
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char name[64];
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snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
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ids[i] = trace_event__id(name);
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if (ids[i] < 0) {
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pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
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return -1;
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}
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nr_events[i] = 0;
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expected_nr_events[i] = random() % 257;
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}
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threads = thread_map__new(-1, getpid());
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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 (threads == NULL) {
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pr_debug("thread_map__new\n");
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goto out_free_threads;
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}
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CPU_ZERO(&cpu_set);
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CPU_SET(cpus->map[0], &cpu_set);
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sched_setaffinity(0, sizeof(cpu_set), &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[0], strerror(errno));
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goto out_free_cpus;
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}
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evlist = perf_evlist__new();
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if (threads == NULL) {
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pr_debug("perf_evlist__new\n");
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goto out_free_cpus;
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}
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/* anonymous union fields, can't be initialized above */
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attr.wakeup_events = 1;
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attr.sample_period = 1;
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/*
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* FIXME: use evsel->attr.sample_type in event__parse_sample.
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* This will nicely remove the requirement that we have
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* all the events with the same sample_type.
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*/
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session.sample_type = attr.sample_type;
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for (i = 0; i < nsyscalls; ++i) {
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attr.config = ids[i];
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evsels[i] = perf_evsel__new(&attr, i);
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if (evsels[i] == NULL) {
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pr_debug("perf_evsel__new\n");
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goto out_free_evlist;
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}
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perf_evlist__add(evlist, evsels[i]);
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if (perf_evsel__open(evsels[i], cpus, threads, false, false) < 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(errno));
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goto out_close_fd;
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}
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}
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if (perf_evlist__mmap(evlist, cpus, threads, 128, true) < 0) {
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pr_debug("failed to mmap events: %d (%s)\n", errno,
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strerror(errno));
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goto out_close_fd;
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}
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for (i = 0; i < nsyscalls; ++i)
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for (j = 0; j < expected_nr_events[i]; ++j) {
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int foo = syscalls[i]();
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++foo;
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}
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while ((event = perf_evlist__read_on_cpu(evlist, 0)) != NULL) {
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struct sample_data sample;
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if (event->header.type != PERF_RECORD_SAMPLE) {
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pr_debug("unexpected %s event\n",
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event__get_event_name(event->header.type));
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goto out_munmap;
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}
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event__parse_sample(event, &session, &sample);
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evsel = perf_evlist__id2evsel(evlist, sample.id);
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if (evsel == NULL) {
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pr_debug("event with id %" PRIu64
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" doesn't map to an evsel\n", sample.id);
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goto out_munmap;
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}
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nr_events[evsel->idx]++;
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}
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list_for_each_entry(evsel, &evlist->entries, node) {
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if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
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pr_debug("expected %d %s events, got %d\n",
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expected_nr_events[evsel->idx],
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event_name(evsel), nr_events[evsel->idx]);
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goto out_munmap;
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}
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}
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err = 0;
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out_munmap:
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perf_evlist__munmap(evlist, 1);
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out_close_fd:
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for (i = 0; i < nsyscalls; ++i)
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perf_evsel__close_fd(evsels[i], 1, threads->nr);
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out_free_evlist:
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perf_evlist__delete(evlist);
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out_free_cpus:
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cpu_map__delete(cpus);
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out_free_threads:
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thread_map__delete(threads);
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return err;
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#undef nsyscalls
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}
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static struct test {
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const char *desc;
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int (*func)(void);
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@ -455,6 +618,10 @@ static struct test {
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.desc = "detect open syscall event on all cpus",
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.func = test__open_syscall_event_on_all_cpus,
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},
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{
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.desc = "read samples using the mmap interface",
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.func = test__basic_mmap,
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},
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{
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.func = NULL,
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},
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