return 0;
}
+#ifdef HAVE_AIO_SUPPORT
+static int record__aio_write(struct aiocb *cblock, int trace_fd,
+ void *buf, size_t size, off_t off)
+{
+ int rc;
+
+ cblock->aio_fildes = trace_fd;
+ cblock->aio_buf = buf;
+ cblock->aio_nbytes = size;
+ cblock->aio_offset = off;
+ cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
+
+ do {
+ rc = aio_write(cblock);
+ if (rc == 0) {
+ break;
+ } else if (errno != EAGAIN) {
+ cblock->aio_fildes = -1;
+ pr_err("failed to queue perf data, error: %m\n");
+ break;
+ }
+ } while (1);
+
+ return rc;
+}
+
+static int record__aio_complete(struct perf_mmap *md, struct aiocb *cblock)
+{
+ void *rem_buf;
+ off_t rem_off;
+ size_t rem_size;
+ int rc, aio_errno;
+ ssize_t aio_ret, written;
+
+ aio_errno = aio_error(cblock);
+ if (aio_errno == EINPROGRESS)
+ return 0;
+
+ written = aio_ret = aio_return(cblock);
+ if (aio_ret < 0) {
+ if (aio_errno != EINTR)
+ pr_err("failed to write perf data, error: %m\n");
+ written = 0;
+ }
+
+ rem_size = cblock->aio_nbytes - written;
+
+ if (rem_size == 0) {
+ cblock->aio_fildes = -1;
+ /*
+ * md->refcount is incremented in perf_mmap__push() for
+ * every enqueued aio write request so decrement it because
+ * the request is now complete.
+ */
+ perf_mmap__put(md);
+ rc = 1;
+ } else {
+ /*
+ * aio write request may require restart with the
+ * reminder if the kernel didn't write whole
+ * chunk at once.
+ */
+ rem_off = cblock->aio_offset + written;
+ rem_buf = (void *)(cblock->aio_buf + written);
+ record__aio_write(cblock, cblock->aio_fildes,
+ rem_buf, rem_size, rem_off);
+ rc = 0;
+ }
+
+ return rc;
+}
+
+static int record__aio_sync(struct perf_mmap *md, bool sync_all)
+{
+ struct aiocb **aiocb = md->aio.aiocb;
+ struct aiocb *cblocks = md->aio.cblocks;
+ struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */
+ int i, do_suspend;
+
+ do {
+ do_suspend = 0;
+ for (i = 0; i < md->aio.nr_cblocks; ++i) {
+ if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
+ if (sync_all)
+ aiocb[i] = NULL;
+ else
+ return i;
+ } else {
+ /*
+ * Started aio write is not complete yet
+ * so it has to be waited before the
+ * next allocation.
+ */
+ aiocb[i] = &cblocks[i];
+ do_suspend = 1;
+ }
+ }
+ if (!do_suspend)
+ return -1;
+
+ while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
+ if (!(errno == EAGAIN || errno == EINTR))
+ pr_err("failed to sync perf data, error: %m\n");
+ }
+ } while (1);
+}
+
+static int record__aio_pushfn(void *to, struct aiocb *cblock, void *bf, size_t size, off_t off)
+{
+ struct record *rec = to;
+ int ret, trace_fd = rec->session->data->file.fd;
+
+ rec->samples++;
+
+ ret = record__aio_write(cblock, trace_fd, bf, size, off);
+ if (!ret) {
+ rec->bytes_written += size;
+ if (switch_output_size(rec))
+ trigger_hit(&switch_output_trigger);
+ }
+
+ return ret;
+}
+
+static off_t record__aio_get_pos(int trace_fd)
+{
+ return lseek(trace_fd, 0, SEEK_CUR);
+}
+
+static void record__aio_set_pos(int trace_fd, off_t pos)
+{
+ lseek(trace_fd, pos, SEEK_SET);
+}
+
+static void record__aio_mmap_read_sync(struct record *rec)
+{
+ int i;
+ struct perf_evlist *evlist = rec->evlist;
+ struct perf_mmap *maps = evlist->mmap;
+
+ if (!rec->opts.nr_cblocks)
+ return;
+
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ struct perf_mmap *map = &maps[i];
+
+ if (map->base)
+ record__aio_sync(map, true);
+ }
+}
+
+static int nr_cblocks_default = 1;
+static int nr_cblocks_max = 4;
+
+static int record__aio_parse(const struct option *opt,
+ const char *str,
+ int unset)
+{
+ struct record_opts *opts = (struct record_opts *)opt->value;
+
+ if (unset) {
+ opts->nr_cblocks = 0;
+ } else {
+ if (str)
+ opts->nr_cblocks = strtol(str, NULL, 0);
+ if (!opts->nr_cblocks)
+ opts->nr_cblocks = nr_cblocks_default;
+ }
+
+ return 0;
+}
+#else /* HAVE_AIO_SUPPORT */
+static int nr_cblocks_max = 0;
+
+static int record__aio_sync(struct perf_mmap *md __maybe_unused, bool sync_all __maybe_unused)
+{
+ return -1;
+}
+
+static int record__aio_pushfn(void *to __maybe_unused, struct aiocb *cblock __maybe_unused,
+ void *bf __maybe_unused, size_t size __maybe_unused, off_t off __maybe_unused)
+{
+ return -1;
+}
+
+static off_t record__aio_get_pos(int trace_fd __maybe_unused)
+{
+ return -1;
+}
+
+static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
+{
+}
+
+static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
+{
+}
+#endif
+
+static int record__aio_enabled(struct record *rec)
+{
+ return rec->opts.nr_cblocks > 0;
+}
+
static int process_synthesized_event(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
if (perf_evlist__mmap_ex(evlist, opts->mmap_pages,
opts->auxtrace_mmap_pages,
- opts->auxtrace_snapshot_mode) < 0) {
+ opts->auxtrace_snapshot_mode, opts->nr_cblocks) < 0) {
if (errno == EPERM) {
pr_err("Permission error mapping pages.\n"
"Consider increasing "
int i;
int rc = 0;
struct perf_mmap *maps;
+ int trace_fd = rec->data.file.fd;
+ off_t off;
if (!evlist)
return 0;
if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
return 0;
+ if (record__aio_enabled(rec))
+ off = record__aio_get_pos(trace_fd);
+
for (i = 0; i < evlist->nr_mmaps; i++) {
struct perf_mmap *map = &maps[i];
if (map->base) {
- if (perf_mmap__push(map, rec, record__pushfn) != 0) {
- rc = -1;
- goto out;
+ if (!record__aio_enabled(rec)) {
+ if (perf_mmap__push(map, rec, record__pushfn) != 0) {
+ rc = -1;
+ goto out;
+ }
+ } else {
+ int idx;
+ /*
+ * Call record__aio_sync() to wait till map->data buffer
+ * becomes available after previous aio write request.
+ */
+ idx = record__aio_sync(map, false);
+ if (perf_mmap__aio_push(map, rec, idx, record__aio_pushfn, &off) != 0) {
+ record__aio_set_pos(trace_fd, off);
+ rc = -1;
+ goto out;
+ }
}
}
}
}
+ if (record__aio_enabled(rec))
+ record__aio_set_pos(trace_fd, off);
+
/*
* Mark the round finished in case we wrote
* at least one event.
err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
process_synthesized_event,
&rec->session->machines.host,
- rec->opts.sample_address,
- rec->opts.proc_map_timeout);
+ rec->opts.sample_address);
thread_map__put(thread_map);
return err;
}
/* Same Size: "2015122520103046"*/
char timestamp[] = "InvalidTimestamp";
+ record__aio_mmap_read_sync(rec);
+
record__synthesize(rec, true);
if (target__none(&rec->opts.target))
record__synthesize_workload(rec, true);
err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
process_synthesized_event, opts->sample_address,
- opts->proc_map_timeout, 1);
+ 1);
out:
return err;
}
record__synthesize_workload(rec, true);
out_child:
+ record__aio_mmap_read_sync(rec);
+
if (forks) {
int exit_status;
var = "call-graph.record-mode";
return perf_default_config(var, value, cb);
}
+#ifdef HAVE_AIO_SUPPORT
+ if (!strcmp(var, "record.aio")) {
+ rec->opts.nr_cblocks = strtol(value, NULL, 0);
+ if (!rec->opts.nr_cblocks)
+ rec->opts.nr_cblocks = nr_cblocks_default;
+ }
+#endif
return 0;
}
.uses_mmap = true,
.default_per_cpu = true,
},
- .proc_map_timeout = 500,
},
.tool = {
.sample = process_sample_event,
parse_clockid),
OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
"opts", "AUX area tracing Snapshot Mode", ""),
- OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,
+ OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
"Record namespaces events"),
"signal"),
OPT_BOOLEAN(0, "dry-run", &dry_run,
"Parse options then exit"),
+#ifdef HAVE_AIO_SUPPORT
+ OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
+ &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
+ record__aio_parse),
+#endif
OPT_END()
};
goto out;
}
+ if (rec->opts.nr_cblocks > nr_cblocks_max)
+ rec->opts.nr_cblocks = nr_cblocks_max;
+ if (verbose > 0)
+ pr_info("nr_cblocks: %d\n", rec->opts.nr_cblocks);
+
err = __cmd_record(&record, argc, argv);
out:
perf_evlist__delete(rec->evlist);
projects / linux-2.6-microblaze.git / blobdiff