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Subject[PATCH 01/10] perf tests: Add thread maps lookup automated tests
Date
Adding automated test for memory maps lookup within multiple machines
threads.

The test creates 4 threads and separated memory maps.

It checks that we could use thread__find_addr_map function with thread
object based on TID to find memory maps.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-1l6knzgxco4zd3cp45jk2hsg@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Makefile.perf | 1 +
tools/perf/perf.h | 6 +
tools/perf/tests/builtin-test.c | 4 +
tools/perf/tests/mmap-thread-lookup.c | 233 ++++++++++++++++++++++++++++++++++
tools/perf/tests/tests.h | 1 +
5 files changed, 245 insertions(+)
create mode 100644 tools/perf/tests/mmap-thread-lookup.c

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 50d875d..667e85a 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -414,6 +414,7 @@ ifeq ($(ARCH),x86)
LIB_OBJS += $(OUTPUT)tests/dwarf-unwind.o
endif
endif
+LIB_OBJS += $(OUTPUT)tests/mmap-thread-lookup.o

BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o
BUILTIN_OBJS += $(OUTPUT)builtin-bench.o
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index e18a8b5..1138c41 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -15,6 +15,9 @@
#ifndef __NR_futex
# define __NR_futex 240
#endif
+#ifndef __NR_gettid
+# define __NR_gettid 224
+#endif
#endif

#if defined(__x86_64__)
@@ -29,6 +32,9 @@
#ifndef __NR_futex
# define __NR_futex 202
#endif
+#ifndef __NR_gettid
+# define __NR_gettid 186
+#endif
#endif

#ifdef __powerpc__
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index b11bf8a..d947d1a 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -124,6 +124,10 @@ static struct test {
#endif
#endif
{
+ .desc = "Test mmap thread lookup",
+ .func = test__mmap_thread_lookup,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/mmap-thread-lookup.c b/tools/perf/tests/mmap-thread-lookup.c
new file mode 100644
index 0000000..cb73e1f
--- /dev/null
+++ b/tools/perf/tests/mmap-thread-lookup.c
@@ -0,0 +1,233 @@
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "debug.h"
+#include "tests.h"
+#include "machine.h"
+#include "thread_map.h"
+#include "symbol.h"
+#include "thread.h"
+
+#define THREADS 4
+
+static int go_away;
+
+struct thread_data {
+ pthread_t pt;
+ pid_t tid;
+ void *map;
+ int ready[2];
+};
+
+static struct thread_data threads[THREADS];
+
+static int thread_init(struct thread_data *td)
+{
+ void *map;
+
+ map = mmap(NULL, page_size,
+ PROT_READ|PROT_WRITE|PROT_EXEC,
+ MAP_SHARED|MAP_ANONYMOUS, -1, 0);
+
+ if (map == MAP_FAILED) {
+ perror("mmap failed");
+ return -1;
+ }
+
+ td->map = map;
+ td->tid = syscall(SYS_gettid);
+
+ pr_debug("tid = %d, map = %p\n", td->tid, map);
+ return 0;
+}
+
+static void *thread_fn(void *arg)
+{
+ struct thread_data *td = arg;
+ ssize_t ret;
+ int go;
+
+ if (thread_init(td))
+ return NULL;
+
+ /* Signal thread_create thread is initialized. */
+ ret = write(td->ready[1], &go, sizeof(int));
+ if (ret != sizeof(int)) {
+ pr_err("failed to notify\n");
+ return NULL;
+ }
+
+ while (!go_away) {
+ /* Waiting for main thread to kill us. */
+ usleep(100);
+ }
+
+ munmap(td->map, page_size);
+ return NULL;
+}
+
+static int thread_create(int i)
+{
+ struct thread_data *td = &threads[i];
+ int err, go;
+
+ if (pipe(td->ready))
+ return -1;
+
+ err = pthread_create(&td->pt, NULL, thread_fn, td);
+ if (!err) {
+ /* Wait for thread initialization. */
+ ssize_t ret = read(td->ready[0], &go, sizeof(int));
+ err = ret != sizeof(int);
+ }
+
+ close(td->ready[0]);
+ close(td->ready[1]);
+ return err;
+}
+
+static int threads_create(void)
+{
+ struct thread_data *td0 = &threads[0];
+ int i, err = 0;
+
+ go_away = 0;
+
+ /* 0 is main thread */
+ if (thread_init(td0))
+ return -1;
+
+ for (i = 1; !err && i < THREADS; i++)
+ err = thread_create(i);
+
+ return err;
+}
+
+static int threads_destroy(void)
+{
+ struct thread_data *td0 = &threads[0];
+ int i, err = 0;
+
+ /* cleanup the main thread */
+ munmap(td0->map, page_size);
+
+ go_away = 1;
+
+ for (i = 1; !err && i < THREADS; i++)
+ err = pthread_join(threads[i].pt, NULL);
+
+ return err;
+}
+
+typedef int (*synth_cb)(struct machine *machine);
+
+static int synth_all(struct machine *machine)
+{
+ return perf_event__synthesize_threads(NULL,
+ perf_event__process,
+ machine, 0);
+}
+
+static int synth_process(struct machine *machine)
+{
+ struct thread_map *map;
+ int err;
+
+ map = thread_map__new_by_pid(getpid());
+
+ err = perf_event__synthesize_thread_map(NULL, map,
+ perf_event__process,
+ machine, 0);
+
+ thread_map__delete(map);
+ return err;
+}
+
+static int mmap_events(synth_cb synth)
+{
+ struct machines machines;
+ struct machine *machine;
+ int err, i;
+
+ /*
+ * The threads_create will not return before all threads
+ * are spawned and all created memory map.
+ *
+ * They will loop until threads_destroy is called, so we
+ * can safely run synthesizing function.
+ */
+ TEST_ASSERT_VAL("failed to create threads", !threads_create());
+
+ machines__init(&machines);
+ machine = &machines.host;
+
+ dump_trace = verbose > 1 ? 1 : 0;
+
+ err = synth(machine);
+
+ dump_trace = 0;
+
+ TEST_ASSERT_VAL("failed to destroy threads", !threads_destroy());
+ TEST_ASSERT_VAL("failed to synthesize maps", !err);
+
+ /*
+ * All data is synthesized, try to find map for each
+ * thread object.
+ */
+ for (i = 0; i < THREADS; i++) {
+ struct thread_data *td = &threads[i];
+ struct addr_location al;
+ struct thread *thread;
+
+ thread = machine__findnew_thread(machine, getpid(), td->tid);
+
+ pr_debug("looking for map %p\n", td->map);
+
+ thread__find_addr_map(thread, machine,
+ PERF_RECORD_MISC_USER, MAP__FUNCTION,
+ (u64) (td->map + 1), &al);
+
+ if (!al.map) {
+ pr_debug("failed, couldn't find map\n");
+ err = -1;
+ break;
+ }
+
+ pr_debug("map %p, addr %lx\n", al.map, al.map->start);
+ }
+
+ machine__delete_threads(machine);
+ machines__exit(&machines);
+ return err;
+}
+
+/*
+ * This test creates 'THREADS' number of threads (including
+ * main thread) and each thread creates memory map.
+ *
+ * When threads are created, we synthesize them with both
+ * (separate tests):
+ * perf_event__synthesize_thread_map (process based)
+ * perf_event__synthesize_threads (global)
+ *
+ * We test we can find all memory maps via:
+ * thread__find_addr_map
+ *
+ * by using all thread objects.
+ */
+int test__mmap_thread_lookup(void)
+{
+ /* perf_event__synthesize_threads synthesize */
+ TEST_ASSERT_VAL("failed with sythesizing all",
+ !mmap_events(synth_all));
+
+ /* perf_event__synthesize_thread_map synthesize */
+ TEST_ASSERT_VAL("failed with sythesizing process",
+ !mmap_events(synth_process));
+
+ return 0;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index a24795c..6db764c 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -41,6 +41,7 @@ int test__sample_parsing(void);
int test__keep_tracking(void);
int test__parse_no_sample_id_all(void);
int test__dwarf_unwind(void);
+int test__mmap_thread_lookup(void);

#if defined(__x86_64__) || defined(__i386__)
#ifdef HAVE_DWARF_UNWIND_SUPPORT
--
1.8.3.1


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