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author | Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> | 2022-01-17 21:34:25 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-02-10 16:25:43 -0300 |
commit | 396b626b95d22664d2f2e5ca332e777ea699a10e (patch) | |
tree | 62b63ac2f48c191a761f3b4ba0ea63d160ba5d3b /tools/perf/builtin-record.c | |
parent | 6fbe4f48ad59d97d78ab778158b4c48a7aba3195 (diff) | |
download | linux-stable-396b626b95d22664d2f2e5ca332e777ea699a10e.tar.gz linux-stable-396b626b95d22664d2f2e5ca332e777ea699a10e.tar.bz2 linux-stable-396b626b95d22664d2f2e5ca332e777ea699a10e.zip |
perf record: Introduce thread local variable
Introduce thread local variable and use it for threaded trace streaming.
Use thread affinity mask instead of record affinity mask in affinity
modes. Use evlist__ctlfd_update() to propagate control commands from
thread object to global evlist object to enable evlist__ctlfd_*
functionality. Move waking and sample statistic to struct record_thread
and introduce record__waking function to calculate the total number of
wakes.
Reviewed-by: Riccardo Mancini <rickyman7@gmail.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Tested-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Riccardo Mancini <rickyman7@gmail.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Antonov <alexander.antonov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/0d127555219991c1dcd6c6bb76b24fa6b78d2932.1642440724.git.alexey.v.bayduraev@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r-- | tools/perf/builtin-record.c | 140 |
1 files changed, 94 insertions, 46 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 0d4a34c66274..163d261dd293 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -108,8 +108,12 @@ struct record_thread { struct mmap **maps; struct mmap **overwrite_maps; struct record *rec; + unsigned long long samples; + unsigned long waking; }; +static __thread struct record_thread *thread; + struct record { struct perf_tool tool; struct record_opts opts; @@ -132,7 +136,6 @@ struct record { bool timestamp_boundary; struct switch_output switch_output; unsigned long long samples; - struct mmap_cpu_mask affinity_mask; unsigned long output_max_size; /* = 0: unlimited */ struct perf_debuginfod debuginfod; int nr_threads; @@ -575,7 +578,7 @@ static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size) bf = map->data; } - rec->samples++; + thread->samples++; return record__write(rec, map, bf, size); } @@ -1315,15 +1318,17 @@ static struct perf_event_header finished_round_event = { static void record__adjust_affinity(struct record *rec, struct mmap *map) { if (rec->opts.affinity != PERF_AFFINITY_SYS && - !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits, - rec->affinity_mask.nbits)) { - bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits); - bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits, - map->affinity_mask.bits, rec->affinity_mask.nbits); - sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask), - (cpu_set_t *)rec->affinity_mask.bits); - if (verbose == 2) - mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread"); + !bitmap_equal(thread->mask->affinity.bits, map->affinity_mask.bits, + thread->mask->affinity.nbits)) { + bitmap_zero(thread->mask->affinity.bits, thread->mask->affinity.nbits); + bitmap_or(thread->mask->affinity.bits, thread->mask->affinity.bits, + map->affinity_mask.bits, thread->mask->affinity.nbits); + sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity), + (cpu_set_t *)thread->mask->affinity.bits); + if (verbose == 2) { + pr_debug("threads[%d]: running on cpu%d: ", thread->tid, sched_getcpu()); + mmap_cpu_mask__scnprintf(&thread->mask->affinity, "affinity"); + } } } @@ -1364,14 +1369,17 @@ static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist, u64 bytes_written = rec->bytes_written; int i; int rc = 0; - struct mmap *maps; + int nr_mmaps; + struct mmap **maps; int trace_fd = rec->data.file.fd; off_t off = 0; if (!evlist) return 0; - maps = overwrite ? evlist->overwrite_mmap : evlist->mmap; + nr_mmaps = thread->nr_mmaps; + maps = overwrite ? thread->overwrite_maps : thread->maps; + if (!maps) return 0; @@ -1381,9 +1389,9 @@ static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist, if (record__aio_enabled(rec)) off = record__aio_get_pos(trace_fd); - for (i = 0; i < evlist->core.nr_mmaps; i++) { + for (i = 0; i < nr_mmaps; i++) { u64 flush = 0; - struct mmap *map = &maps[i]; + struct mmap *map = maps[i]; if (map->core.base) { record__adjust_affinity(rec, map); @@ -1446,6 +1454,15 @@ static int record__mmap_read_all(struct record *rec, bool synch) return record__mmap_read_evlist(rec, rec->evlist, true, synch); } +static void record__thread_munmap_filtered(struct fdarray *fda, int fd, + void *arg __maybe_unused) +{ + struct perf_mmap *map = fda->priv[fd].ptr; + + if (map) + perf_mmap__put(map); +} + static void record__init_features(struct record *rec) { struct perf_session *session = rec->session; @@ -1869,11 +1886,44 @@ static void record__uniquify_name(struct record *rec) } } +static int record__start_threads(struct record *rec) +{ + struct record_thread *thread_data = rec->thread_data; + + thread = &thread_data[0]; + + pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu()); + + return 0; +} + +static int record__stop_threads(struct record *rec) +{ + int t; + struct record_thread *thread_data = rec->thread_data; + + for (t = 0; t < rec->nr_threads; t++) + rec->samples += thread_data[t].samples; + + return 0; +} + +static unsigned long record__waking(struct record *rec) +{ + int t; + unsigned long waking = 0; + struct record_thread *thread_data = rec->thread_data; + + for (t = 0; t < rec->nr_threads; t++) + waking += thread_data[t].waking; + + return waking; +} + static int __cmd_record(struct record *rec, int argc, const char **argv) { int err; int status = 0; - unsigned long waking = 0; const bool forks = argc > 0; struct perf_tool *tool = &rec->tool; struct record_opts *opts = &rec->opts; @@ -1977,7 +2027,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) if (record__open(rec) != 0) { err = -1; - goto out_child; + goto out_free_threads; } session->header.env.comp_mmap_len = session->evlist->core.mmap_len; @@ -1985,7 +2035,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) err = record__kcore_copy(&session->machines.host, data); if (err) { pr_err("ERROR: Failed to copy kcore\n"); - goto out_child; + goto out_free_threads; } } @@ -1996,7 +2046,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf)); pr_err("ERROR: Apply config to BPF failed: %s\n", errbuf); - goto out_child; + goto out_free_threads; } /* @@ -2014,11 +2064,11 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) if (data->is_pipe) { err = perf_header__write_pipe(fd); if (err < 0) - goto out_child; + goto out_free_threads; } else { err = perf_session__write_header(session, rec->evlist, fd, false); if (err < 0) - goto out_child; + goto out_free_threads; } err = -1; @@ -2026,16 +2076,16 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) { pr_err("Couldn't generate buildids. " "Use --no-buildid to profile anyway.\n"); - goto out_child; + goto out_free_threads; } err = record__setup_sb_evlist(rec); if (err) - goto out_child; + goto out_free_threads; err = record__synthesize(rec, false); if (err < 0) - goto out_child; + goto out_free_threads; if (rec->realtime_prio) { struct sched_param param; @@ -2044,10 +2094,13 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { pr_err("Could not set realtime priority.\n"); err = -1; - goto out_child; + goto out_free_threads; } } + if (record__start_threads(rec)) + goto out_free_threads; + /* * When perf is starting the traced process, all the events * (apart from group members) have enable_on_exec=1 set, @@ -2118,7 +2171,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) trigger_ready(&switch_output_trigger); perf_hooks__invoke_record_start(); for (;;) { - unsigned long long hits = rec->samples; + unsigned long long hits = thread->samples; /* * rec->evlist->bkw_mmap_state is possible to be @@ -2172,8 +2225,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) if (!quiet) fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", - waking); - waking = 0; + record__waking(rec)); + thread->waking = 0; fd = record__switch_output(rec, false); if (fd < 0) { pr_err("Failed to switch to new file\n"); @@ -2187,20 +2240,24 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) alarm(rec->switch_output.time); } - if (hits == rec->samples) { + if (hits == thread->samples) { if (done || draining) break; - err = evlist__poll(rec->evlist, -1); + err = fdarray__poll(&thread->pollfd, -1); /* * Propagate error, only if there's any. Ignore positive * number of returned events and interrupt error. */ if (err > 0 || (err < 0 && errno == EINTR)) err = 0; - waking++; + thread->waking++; - if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0) + if (fdarray__filter(&thread->pollfd, POLLERR | POLLHUP, + record__thread_munmap_filtered, NULL) == 0) draining = true; + + evlist__ctlfd_update(rec->evlist, + &thread->pollfd.entries[thread->ctlfd_pos]); } if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) { @@ -2254,15 +2311,18 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) } if (!quiet) - fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); + fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", + record__waking(rec)); if (target__none(&rec->opts.target)) record__synthesize_workload(rec, true); out_child: - evlist__finalize_ctlfd(rec->evlist); + record__stop_threads(rec); record__mmap_read_all(rec, true); +out_free_threads: record__free_thread_data(rec); + evlist__finalize_ctlfd(rec->evlist); record__aio_mmap_read_sync(rec); if (rec->session->bytes_transferred && rec->session->bytes_compressed) { @@ -3164,17 +3224,6 @@ int cmd_record(int argc, const char **argv) symbol__init(NULL); - if (rec->opts.affinity != PERF_AFFINITY_SYS) { - rec->affinity_mask.nbits = cpu__max_cpu().cpu; - rec->affinity_mask.bits = bitmap_zalloc(rec->affinity_mask.nbits); - if (!rec->affinity_mask.bits) { - pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits); - err = -ENOMEM; - goto out_opts; - } - pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits); - } - err = record__auxtrace_init(rec); if (err) goto out; @@ -3323,7 +3372,6 @@ int cmd_record(int argc, const char **argv) err = __cmd_record(&record, argc, argv); out: - bitmap_free(rec->affinity_mask.bits); evlist__delete(rec->evlist); symbol__exit(); auxtrace_record__free(rec->itr); |