1 files changed, 172 insertions, 12 deletions

diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 5dcdba653d70..1b2106c58f66 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -7,10 +7,11 @@
 
 #include "util/cache.h"
 #include "util/debug.h"
+#include "util/evlist.h"
 #include "util/parse-options.h"
-#include "util/session.h"
+#include "util/parse-events.h"
 #include "util/symbol.h"
-#include "util/thread.h"
+#include "util/thread_map.h"
 
 static long page_size;
 
@@ -238,14 +239,14 @@ out:
 #include "util/evsel.h"
 #include <sys/types.h>
 
-static int trace_event__id(const char *event_name)
+static int trace_event__id(const char *evname)
 {
         char *filename;
         int err = -1, fd;
 
         if (asprintf(&filename,
                      "/sys/kernel/debug/tracing/events/syscalls/%s/id",
-                     event_name) < 0)
+                     evname) < 0)
                 return -1;
 
         fd = open(filename, O_RDONLY);
@@ -289,7 +290,7 @@ static int test__open_syscall_event(void)
                 goto out_thread_map_delete;
         }
 
-        if (perf_evsel__open_per_thread(evsel, threads) < 0) {
+        if (perf_evsel__open_per_thread(evsel, threads, false, false) < 0) {
                 pr_debug("failed to open counter: %s, "
                          "tweak /proc/sys/kernel/perf_event_paranoid?\n",
                          strerror(errno));
@@ -347,9 +348,9 @@ static int test__open_syscall_event_on_all_cpus(void)
         }
 
         cpus = cpu_map__new(NULL);
-        if (threads == NULL) {
-                pr_debug("thread_map__new\n");
-                return -1;
+        if (cpus == NULL) {
+                pr_debug("cpu_map__new\n");
+                goto out_thread_map_delete;
         }
 
 
@@ -364,7 +365,7 @@ static int test__open_syscall_event_on_all_cpus(void)
                 goto out_thread_map_delete;
         }
 
-        if (perf_evsel__open(evsel, cpus, threads) < 0) {
+        if (perf_evsel__open(evsel, cpus, threads, false, false) < 0) {
                 pr_debug("failed to open counter: %s, "
                          "tweak /proc/sys/kernel/perf_event_paranoid?\n",
                          strerror(errno));
@@ -408,6 +409,8 @@ static int test__open_syscall_event_on_all_cpus(void)
                 goto out_close_fd;
         }
 
+        err = 0;
+
         for (cpu = 0; cpu < cpus->nr; ++cpu) {
                 unsigned int expected;
 
@@ -416,18 +419,18 @@ static int test__open_syscall_event_on_all_cpus(void)
 
                 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
                         pr_debug("perf_evsel__open_read_on_cpu\n");
-                        goto out_close_fd;
+                        err = -1;
+                        break;
                 }
 
                 expected = nr_open_calls + cpu;
                 if (evsel->counts->cpu[cpu].val != expected) {
                         pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
                                  expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
-                        goto out_close_fd;
+                        err = -1;
                 }
         }
 
-        err = 0;
 out_close_fd:
         perf_evsel__close_fd(evsel, 1, threads->nr);
 out_evsel_delete:
@@ -437,6 +440,159 @@ out_thread_map_delete:
         return err;
 }
 
+/*
+ * 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
+ * the 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.
+ */
+static int test__basic_mmap(void)
+{
+        int err = -1;
+        union perf_event *event;
+        struct thread_map *threads;
+        struct cpu_map *cpus;
+        struct perf_evlist *evlist;
+        struct perf_event_attr attr = {
+                .type           = PERF_TYPE_TRACEPOINT,
+                .read_format    = PERF_FORMAT_ID,
+                .sample_type    = PERF_SAMPLE_ID,
+                .watermark      = 0,
+        };
+        cpu_set_t cpu_set;
+        const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
+                                        "getpgid", };
+        pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
+                                      (void*)getpgid };
+#define nsyscalls ARRAY_SIZE(syscall_names)
+        int ids[nsyscalls];
+        unsigned int nr_events[nsyscalls],
+                     expected_nr_events[nsyscalls], i, j;
+        struct perf_evsel *evsels[nsyscalls], *evsel;
+
+        for (i = 0; i < nsyscalls; ++i) {
+                char name[64];
+
+                snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
+                ids[i] = trace_event__id(name);
+                if (ids[i] < 0) {
+                        pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
+                        return -1;
+                }
+                nr_events[i] = 0;
+                expected_nr_events[i] = random() % 257;
+        }
+
+        threads = thread_map__new(-1, getpid());
+        if (threads == NULL) {
+                pr_debug("thread_map__new\n");
+                return -1;
+        }
+
+        cpus = cpu_map__new(NULL);
+        if (cpus == NULL) {
+                pr_debug("cpu_map__new\n");
+                goto out_free_threads;
+        }
+
+        CPU_ZERO(&cpu_set);
+        CPU_SET(cpus->map[0], &cpu_set);
+        sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
+        if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
+                pr_debug("sched_setaffinity() failed on CPU %d: %s ",
+                         cpus->map[0], strerror(errno));
+                goto out_free_cpus;
+        }
+
+        evlist = perf_evlist__new(cpus, threads);
+        if (evlist == NULL) {
+                pr_debug("perf_evlist__new\n");
+                goto out_free_cpus;
+        }
+
+        /* anonymous union fields, can't be initialized above */
+        attr.wakeup_events = 1;
+        attr.sample_period = 1;
+
+        for (i = 0; i < nsyscalls; ++i) {
+                attr.config = ids[i];
+                evsels[i] = perf_evsel__new(&attr, i);
+                if (evsels[i] == NULL) {
+                        pr_debug("perf_evsel__new\n");
+                        goto out_free_evlist;
+                }
+
+                perf_evlist__add(evlist, evsels[i]);
+
+                if (perf_evsel__open(evsels[i], cpus, threads, false, false) < 0) {
+                        pr_debug("failed to open counter: %s, "
+                                 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
+                                 strerror(errno));
+                        goto out_close_fd;
+                }
+        }
+
+        if (perf_evlist__mmap(evlist, 128, true) < 0) {
+                pr_debug("failed to mmap events: %d (%s)\n", errno,
+                         strerror(errno));
+                goto out_close_fd;
+        }
+
+        for (i = 0; i < nsyscalls; ++i)
+                for (j = 0; j < expected_nr_events[i]; ++j) {
+                        int foo = syscalls[i]();
+                        ++foo;
+                }
+
+        while ((event = perf_evlist__read_on_cpu(evlist, 0)) != NULL) {
+                struct perf_sample sample;
+
+                if (event->header.type != PERF_RECORD_SAMPLE) {
+                        pr_debug("unexpected %s event\n",
+                                 perf_event__name(event->header.type));
+                        goto out_munmap;
+                }
+
+                perf_event__parse_sample(event, attr.sample_type, false, &sample);
+                evsel = perf_evlist__id2evsel(evlist, sample.id);
+                if (evsel == NULL) {
+                        pr_debug("event with id %" PRIu64
+                                 " doesn't map to an evsel\n", sample.id);
+                        goto out_munmap;
+                }
+                nr_events[evsel->idx]++;
+        }
+
+        list_for_each_entry(evsel, &evlist->entries, node) {
+                if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
+                        pr_debug("expected %d %s events, got %d\n",
+                                 expected_nr_events[evsel->idx],
+                                 event_name(evsel), nr_events[evsel->idx]);
+                        goto out_munmap;
+                }
+        }
+
+        err = 0;
+out_munmap:
+        perf_evlist__munmap(evlist);
+out_close_fd:
+        for (i = 0; i < nsyscalls; ++i)
+                perf_evsel__close_fd(evsels[i], 1, threads->nr);
+out_free_evlist:
+        perf_evlist__delete(evlist);
+out_free_cpus:
+        cpu_map__delete(cpus);
+out_free_threads:
+        thread_map__delete(threads);
+        return err;
+#undef nsyscalls
+}
+
 static struct test {
         const char *desc;
         int (*func)(void);
@@ -454,6 +610,10 @@ static struct test {
                 .func = test__open_syscall_event_on_all_cpus,
         },
         {
+                .desc = "read samples using the mmap interface",
+                .func = test__basic_mmap,
+        },
+        {
                 .func = NULL,
         },
 };