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- // SPDX-License-Identifier: GPL-2.0
- /*
- * builtin-record.c
- *
- * Builtin record command: Record the profile of a workload
- * (or a CPU, or a PID) into the perf.data output file - for
- * later analysis via perf report.
- */
- #include "builtin.h"
- #include "util/build-id.h"
- #include <subcmd/parse-options.h>
- #include "util/parse-events.h"
- #include "util/config.h"
- #include "util/callchain.h"
- #include "util/cgroup.h"
- #include "util/header.h"
- #include "util/event.h"
- #include "util/evlist.h"
- #include "util/evsel.h"
- #include "util/debug.h"
- #include "util/mmap.h"
- #include "util/target.h"
- #include "util/session.h"
- #include "util/tool.h"
- #include "util/symbol.h"
- #include "util/record.h"
- #include "util/cpumap.h"
- #include "util/thread_map.h"
- #include "util/data.h"
- #include "util/perf_regs.h"
- #include "util/auxtrace.h"
- #include "util/tsc.h"
- #include "util/parse-branch-options.h"
- #include "util/parse-regs-options.h"
- #include "util/perf_api_probe.h"
- #include "util/llvm-utils.h"
- #include "util/bpf-loader.h"
- #include "util/trigger.h"
- #include "util/perf-hooks.h"
- #include "util/cpu-set-sched.h"
- #include "util/synthetic-events.h"
- #include "util/time-utils.h"
- #include "util/units.h"
- #include "util/bpf-event.h"
- #include "util/util.h"
- #include "util/pfm.h"
- #include "util/clockid.h"
- #include "asm/bug.h"
- #include "perf.h"
- #include <errno.h>
- #include <inttypes.h>
- #include <locale.h>
- #include <poll.h>
- #include <pthread.h>
- #include <unistd.h>
- #include <sched.h>
- #include <signal.h>
- #ifdef HAVE_EVENTFD_SUPPORT
- #include <sys/eventfd.h>
- #endif
- #include <sys/mman.h>
- #include <sys/wait.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <linux/err.h>
- #include <linux/string.h>
- #include <linux/time64.h>
- #include <linux/zalloc.h>
- #include <linux/bitmap.h>
- #include <sys/time.h>
- struct switch_output {
- bool enabled;
- bool signal;
- unsigned long size;
- unsigned long time;
- const char *str;
- bool set;
- char **filenames;
- int num_files;
- int cur_file;
- };
- struct record {
- struct perf_tool tool;
- struct record_opts opts;
- u64 bytes_written;
- struct perf_data data;
- struct auxtrace_record *itr;
- struct evlist *evlist;
- struct perf_session *session;
- struct evlist *sb_evlist;
- pthread_t thread_id;
- int realtime_prio;
- bool switch_output_event_set;
- bool no_buildid;
- bool no_buildid_set;
- bool no_buildid_cache;
- bool no_buildid_cache_set;
- bool buildid_all;
- bool timestamp_filename;
- 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 */
- };
- static volatile int done;
- static volatile int auxtrace_record__snapshot_started;
- static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
- static DEFINE_TRIGGER(switch_output_trigger);
- static const char *affinity_tags[PERF_AFFINITY_MAX] = {
- "SYS", "NODE", "CPU"
- };
- static bool switch_output_signal(struct record *rec)
- {
- return rec->switch_output.signal &&
- trigger_is_ready(&switch_output_trigger);
- }
- static bool switch_output_size(struct record *rec)
- {
- return rec->switch_output.size &&
- trigger_is_ready(&switch_output_trigger) &&
- (rec->bytes_written >= rec->switch_output.size);
- }
- static bool switch_output_time(struct record *rec)
- {
- return rec->switch_output.time &&
- trigger_is_ready(&switch_output_trigger);
- }
- static bool record__output_max_size_exceeded(struct record *rec)
- {
- return rec->output_max_size &&
- (rec->bytes_written >= rec->output_max_size);
- }
- static int record__write(struct record *rec, struct mmap *map __maybe_unused,
- void *bf, size_t size)
- {
- struct perf_data_file *file = &rec->session->data->file;
- if (perf_data_file__write(file, bf, size) < 0) {
- pr_err("failed to write perf data, error: %m\n");
- return -1;
- }
- rec->bytes_written += size;
- if (record__output_max_size_exceeded(rec) && !done) {
- fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
- " stopping session ]\n",
- rec->bytes_written >> 10);
- done = 1;
- }
- if (switch_output_size(rec))
- trigger_hit(&switch_output_trigger);
- return 0;
- }
- static int record__aio_enabled(struct record *rec);
- static int record__comp_enabled(struct record *rec);
- static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
- void *src, size_t src_size);
- #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 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 record__aio_pushfn() for
- * every aio write request started in record__aio_push() so
- * decrement it because the request is now complete.
- */
- perf_mmap__put(&md->core);
- 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 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);
- }
- struct record_aio {
- struct record *rec;
- void *data;
- size_t size;
- };
- static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
- {
- struct record_aio *aio = to;
- /*
- * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
- * to release space in the kernel buffer as fast as possible, calling
- * perf_mmap__consume() from perf_mmap__push() function.
- *
- * That lets the kernel to proceed with storing more profiling data into
- * the kernel buffer earlier than other per-cpu kernel buffers are handled.
- *
- * Coping can be done in two steps in case the chunk of profiling data
- * crosses the upper bound of the kernel buffer. In this case we first move
- * part of data from map->start till the upper bound and then the reminder
- * from the beginning of the kernel buffer till the end of the data chunk.
- */
- if (record__comp_enabled(aio->rec)) {
- size = zstd_compress(aio->rec->session, aio->data + aio->size,
- mmap__mmap_len(map) - aio->size,
- buf, size);
- } else {
- memcpy(aio->data + aio->size, buf, size);
- }
- if (!aio->size) {
- /*
- * Increment map->refcount to guard map->aio.data[] buffer
- * from premature deallocation because map object can be
- * released earlier than aio write request started on
- * map->aio.data[] buffer is complete.
- *
- * perf_mmap__put() is done at record__aio_complete()
- * after started aio request completion or at record__aio_push()
- * if the request failed to start.
- */
- perf_mmap__get(&map->core);
- }
- aio->size += size;
- return size;
- }
- static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
- {
- int ret, idx;
- int trace_fd = rec->session->data->file.fd;
- struct record_aio aio = { .rec = rec, .size = 0 };
- /*
- * Call record__aio_sync() to wait till map->aio.data[] buffer
- * becomes available after previous aio write operation.
- */
- idx = record__aio_sync(map, false);
- aio.data = map->aio.data[idx];
- ret = perf_mmap__push(map, &aio, record__aio_pushfn);
- if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
- return ret;
- rec->samples++;
- ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
- if (!ret) {
- *off += aio.size;
- rec->bytes_written += aio.size;
- if (switch_output_size(rec))
- trigger_hit(&switch_output_trigger);
- } else {
- /*
- * Decrement map->refcount incremented in record__aio_pushfn()
- * back if record__aio_write() operation failed to start, otherwise
- * map->refcount is decremented in record__aio_complete() after
- * aio write operation finishes successfully.
- */
- perf_mmap__put(&map->core);
- }
- 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 evlist *evlist = rec->evlist;
- struct mmap *maps = evlist->mmap;
- if (!record__aio_enabled(rec))
- return;
- for (i = 0; i < evlist->core.nr_mmaps; i++) {
- struct mmap *map = &maps[i];
- if (map->core.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_push(struct record *rec __maybe_unused, struct mmap *map __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;
- }
- #define MMAP_FLUSH_DEFAULT 1
- static int record__mmap_flush_parse(const struct option *opt,
- const char *str,
- int unset)
- {
- int flush_max;
- struct record_opts *opts = (struct record_opts *)opt->value;
- static struct parse_tag tags[] = {
- { .tag = 'B', .mult = 1 },
- { .tag = 'K', .mult = 1 << 10 },
- { .tag = 'M', .mult = 1 << 20 },
- { .tag = 'G', .mult = 1 << 30 },
- { .tag = 0 },
- };
- if (unset)
- return 0;
- if (str) {
- opts->mmap_flush = parse_tag_value(str, tags);
- if (opts->mmap_flush == (int)-1)
- opts->mmap_flush = strtol(str, NULL, 0);
- }
- if (!opts->mmap_flush)
- opts->mmap_flush = MMAP_FLUSH_DEFAULT;
- flush_max = evlist__mmap_size(opts->mmap_pages);
- flush_max /= 4;
- if (opts->mmap_flush > flush_max)
- opts->mmap_flush = flush_max;
- return 0;
- }
- #ifdef HAVE_ZSTD_SUPPORT
- static unsigned int comp_level_default = 1;
- static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
- {
- struct record_opts *opts = opt->value;
- if (unset) {
- opts->comp_level = 0;
- } else {
- if (str)
- opts->comp_level = strtol(str, NULL, 0);
- if (!opts->comp_level)
- opts->comp_level = comp_level_default;
- }
- return 0;
- }
- #endif
- static unsigned int comp_level_max = 22;
- static int record__comp_enabled(struct record *rec)
- {
- return rec->opts.comp_level > 0;
- }
- static int process_synthesized_event(struct perf_tool *tool,
- union perf_event *event,
- struct perf_sample *sample __maybe_unused,
- struct machine *machine __maybe_unused)
- {
- struct record *rec = container_of(tool, struct record, tool);
- return record__write(rec, NULL, event, event->header.size);
- }
- static int process_locked_synthesized_event(struct perf_tool *tool,
- union perf_event *event,
- struct perf_sample *sample __maybe_unused,
- struct machine *machine __maybe_unused)
- {
- static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
- int ret;
- pthread_mutex_lock(&synth_lock);
- ret = process_synthesized_event(tool, event, sample, machine);
- pthread_mutex_unlock(&synth_lock);
- return ret;
- }
- static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
- {
- struct record *rec = to;
- if (record__comp_enabled(rec)) {
- size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
- bf = map->data;
- }
- rec->samples++;
- return record__write(rec, map, bf, size);
- }
- static volatile int signr = -1;
- static volatile int child_finished;
- #ifdef HAVE_EVENTFD_SUPPORT
- static int done_fd = -1;
- #endif
- static void sig_handler(int sig)
- {
- if (sig == SIGCHLD)
- child_finished = 1;
- else
- signr = sig;
- done = 1;
- #ifdef HAVE_EVENTFD_SUPPORT
- {
- u64 tmp = 1;
- /*
- * It is possible for this signal handler to run after done is checked
- * in the main loop, but before the perf counter fds are polled. If this
- * happens, the poll() will continue to wait even though done is set,
- * and will only break out if either another signal is received, or the
- * counters are ready for read. To ensure the poll() doesn't sleep when
- * done is set, use an eventfd (done_fd) to wake up the poll().
- */
- if (write(done_fd, &tmp, sizeof(tmp)) < 0)
- pr_err("failed to signal wakeup fd, error: %m\n");
- }
- #endif // HAVE_EVENTFD_SUPPORT
- }
- static void sigsegv_handler(int sig)
- {
- perf_hooks__recover();
- sighandler_dump_stack(sig);
- }
- static void record__sig_exit(void)
- {
- if (signr == -1)
- return;
- signal(signr, SIG_DFL);
- raise(signr);
- }
- #ifdef HAVE_AUXTRACE_SUPPORT
- static int record__process_auxtrace(struct perf_tool *tool,
- struct mmap *map,
- union perf_event *event, void *data1,
- size_t len1, void *data2, size_t len2)
- {
- struct record *rec = container_of(tool, struct record, tool);
- struct perf_data *data = &rec->data;
- size_t padding;
- u8 pad[8] = {0};
- if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
- off_t file_offset;
- int fd = perf_data__fd(data);
- int err;
- file_offset = lseek(fd, 0, SEEK_CUR);
- if (file_offset == -1)
- return -1;
- err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
- event, file_offset);
- if (err)
- return err;
- }
- /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
- padding = (len1 + len2) & 7;
- if (padding)
- padding = 8 - padding;
- record__write(rec, map, event, event->header.size);
- record__write(rec, map, data1, len1);
- if (len2)
- record__write(rec, map, data2, len2);
- record__write(rec, map, &pad, padding);
- return 0;
- }
- static int record__auxtrace_mmap_read(struct record *rec,
- struct mmap *map)
- {
- int ret;
- ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
- record__process_auxtrace);
- if (ret < 0)
- return ret;
- if (ret)
- rec->samples++;
- return 0;
- }
- static int record__auxtrace_mmap_read_snapshot(struct record *rec,
- struct mmap *map)
- {
- int ret;
- ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
- record__process_auxtrace,
- rec->opts.auxtrace_snapshot_size);
- if (ret < 0)
- return ret;
- if (ret)
- rec->samples++;
- return 0;
- }
- static int record__auxtrace_read_snapshot_all(struct record *rec)
- {
- int i;
- int rc = 0;
- for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
- struct mmap *map = &rec->evlist->mmap[i];
- if (!map->auxtrace_mmap.base)
- continue;
- if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
- rc = -1;
- goto out;
- }
- }
- out:
- return rc;
- }
- static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
- {
- pr_debug("Recording AUX area tracing snapshot\n");
- if (record__auxtrace_read_snapshot_all(rec) < 0) {
- trigger_error(&auxtrace_snapshot_trigger);
- } else {
- if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
- trigger_error(&auxtrace_snapshot_trigger);
- else
- trigger_ready(&auxtrace_snapshot_trigger);
- }
- }
- static int record__auxtrace_snapshot_exit(struct record *rec)
- {
- if (trigger_is_error(&auxtrace_snapshot_trigger))
- return 0;
- if (!auxtrace_record__snapshot_started &&
- auxtrace_record__snapshot_start(rec->itr))
- return -1;
- record__read_auxtrace_snapshot(rec, true);
- if (trigger_is_error(&auxtrace_snapshot_trigger))
- return -1;
- return 0;
- }
- static int record__auxtrace_init(struct record *rec)
- {
- int err;
- if (!rec->itr) {
- rec->itr = auxtrace_record__init(rec->evlist, &err);
- if (err)
- return err;
- }
- err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
- rec->opts.auxtrace_snapshot_opts);
- if (err)
- return err;
- err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
- rec->opts.auxtrace_sample_opts);
- if (err)
- return err;
- return auxtrace_parse_filters(rec->evlist);
- }
- #else
- static inline
- int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
- struct mmap *map __maybe_unused)
- {
- return 0;
- }
- static inline
- void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
- bool on_exit __maybe_unused)
- {
- }
- static inline
- int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
- {
- return 0;
- }
- static inline
- int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
- {
- return 0;
- }
- static int record__auxtrace_init(struct record *rec __maybe_unused)
- {
- return 0;
- }
- #endif
- static int record__config_text_poke(struct evlist *evlist)
- {
- struct evsel *evsel;
- int err;
- /* Nothing to do if text poke is already configured */
- evlist__for_each_entry(evlist, evsel) {
- if (evsel->core.attr.text_poke)
- return 0;
- }
- err = parse_events(evlist, "dummy:u", NULL);
- if (err)
- return err;
- evsel = evlist__last(evlist);
- evsel->core.attr.freq = 0;
- evsel->core.attr.sample_period = 1;
- evsel->core.attr.text_poke = 1;
- evsel->core.attr.ksymbol = 1;
- evsel->core.system_wide = true;
- evsel->no_aux_samples = true;
- evsel->immediate = true;
- /* Text poke must be collected on all CPUs */
- perf_cpu_map__put(evsel->core.own_cpus);
- evsel->core.own_cpus = perf_cpu_map__new(NULL);
- perf_cpu_map__put(evsel->core.cpus);
- evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
- evsel__set_sample_bit(evsel, TIME);
- return 0;
- }
- static bool record__kcore_readable(struct machine *machine)
- {
- char kcore[PATH_MAX];
- int fd;
- scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
- fd = open(kcore, O_RDONLY);
- if (fd < 0)
- return false;
- close(fd);
- return true;
- }
- static int record__kcore_copy(struct machine *machine, struct perf_data *data)
- {
- char from_dir[PATH_MAX];
- char kcore_dir[PATH_MAX];
- int ret;
- snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
- ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
- if (ret)
- return ret;
- return kcore_copy(from_dir, kcore_dir);
- }
- static int record__mmap_evlist(struct record *rec,
- struct evlist *evlist)
- {
- struct record_opts *opts = &rec->opts;
- bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
- opts->auxtrace_sample_mode;
- char msg[512];
- if (opts->affinity != PERF_AFFINITY_SYS)
- cpu__setup_cpunode_map();
- if (evlist__mmap_ex(evlist, opts->mmap_pages,
- opts->auxtrace_mmap_pages,
- auxtrace_overwrite,
- opts->nr_cblocks, opts->affinity,
- opts->mmap_flush, opts->comp_level) < 0) {
- if (errno == EPERM) {
- pr_err("Permission error mapping pages.\n"
- "Consider increasing "
- "/proc/sys/kernel/perf_event_mlock_kb,\n"
- "or try again with a smaller value of -m/--mmap_pages.\n"
- "(current value: %u,%u)\n",
- opts->mmap_pages, opts->auxtrace_mmap_pages);
- return -errno;
- } else {
- pr_err("failed to mmap with %d (%s)\n", errno,
- str_error_r(errno, msg, sizeof(msg)));
- if (errno)
- return -errno;
- else
- return -EINVAL;
- }
- }
- return 0;
- }
- static int record__mmap(struct record *rec)
- {
- return record__mmap_evlist(rec, rec->evlist);
- }
- static int record__open(struct record *rec)
- {
- char msg[BUFSIZ];
- struct evsel *pos;
- struct evlist *evlist = rec->evlist;
- struct perf_session *session = rec->session;
- struct record_opts *opts = &rec->opts;
- int rc = 0;
- /*
- * For initial_delay or system wide, we need to add a dummy event so
- * that we can track PERF_RECORD_MMAP to cover the delay of waiting or
- * event synthesis.
- */
- if (opts->initial_delay || target__has_cpu(&opts->target)) {
- pos = perf_evlist__get_tracking_event(evlist);
- if (!evsel__is_dummy_event(pos)) {
- /* Set up dummy event. */
- if (evlist__add_dummy(evlist))
- return -ENOMEM;
- pos = evlist__last(evlist);
- perf_evlist__set_tracking_event(evlist, pos);
- }
- /*
- * Enable the dummy event when the process is forked for
- * initial_delay, immediately for system wide.
- */
- if (opts->initial_delay && !pos->immediate)
- pos->core.attr.enable_on_exec = 1;
- else
- pos->immediate = 1;
- }
- perf_evlist__config(evlist, opts, &callchain_param);
- evlist__for_each_entry(evlist, pos) {
- try_again:
- if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
- if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
- if (verbose > 0)
- ui__warning("%s\n", msg);
- goto try_again;
- }
- if ((errno == EINVAL || errno == EBADF) &&
- pos->leader != pos &&
- pos->weak_group) {
- pos = perf_evlist__reset_weak_group(evlist, pos, true);
- goto try_again;
- }
- rc = -errno;
- evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
- ui__error("%s\n", msg);
- goto out;
- }
- pos->supported = true;
- }
- if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(evlist)) {
- pr_warning(
- "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
- "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
- "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
- "file is not found in the buildid cache or in the vmlinux path.\n\n"
- "Samples in kernel modules won't be resolved at all.\n\n"
- "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
- "even with a suitable vmlinux or kallsyms file.\n\n");
- }
- if (perf_evlist__apply_filters(evlist, &pos)) {
- pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
- pos->filter, evsel__name(pos), errno,
- str_error_r(errno, msg, sizeof(msg)));
- rc = -1;
- goto out;
- }
- rc = record__mmap(rec);
- if (rc)
- goto out;
- session->evlist = evlist;
- perf_session__set_id_hdr_size(session);
- out:
- return rc;
- }
- static int process_sample_event(struct perf_tool *tool,
- union perf_event *event,
- struct perf_sample *sample,
- struct evsel *evsel,
- struct machine *machine)
- {
- struct record *rec = container_of(tool, struct record, tool);
- if (rec->evlist->first_sample_time == 0)
- rec->evlist->first_sample_time = sample->time;
- rec->evlist->last_sample_time = sample->time;
- if (rec->buildid_all)
- return 0;
- rec->samples++;
- return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
- }
- static int process_buildids(struct record *rec)
- {
- struct perf_session *session = rec->session;
- if (perf_data__size(&rec->data) == 0)
- return 0;
- /*
- * During this process, it'll load kernel map and replace the
- * dso->long_name to a real pathname it found. In this case
- * we prefer the vmlinux path like
- * /lib/modules/3.16.4/build/vmlinux
- *
- * rather than build-id path (in debug directory).
- * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
- */
- symbol_conf.ignore_vmlinux_buildid = true;
- /*
- * If --buildid-all is given, it marks all DSO regardless of hits,
- * so no need to process samples. But if timestamp_boundary is enabled,
- * it still needs to walk on all samples to get the timestamps of
- * first/last samples.
- */
- if (rec->buildid_all && !rec->timestamp_boundary)
- rec->tool.sample = NULL;
- return perf_session__process_events(session);
- }
- static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
- {
- int err;
- struct perf_tool *tool = data;
- /*
- *As for guest kernel when processing subcommand record&report,
- *we arrange module mmap prior to guest kernel mmap and trigger
- *a preload dso because default guest module symbols are loaded
- *from guest kallsyms instead of /lib/modules/XXX/XXX. This
- *method is used to avoid symbol missing when the first addr is
- *in module instead of in guest kernel.
- */
- err = perf_event__synthesize_modules(tool, process_synthesized_event,
- machine);
- if (err < 0)
- pr_err("Couldn't record guest kernel [%d]'s reference"
- " relocation symbol.\n", machine->pid);
- /*
- * We use _stext for guest kernel because guest kernel's /proc/kallsyms
- * have no _text sometimes.
- */
- err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
- machine);
- if (err < 0)
- pr_err("Couldn't record guest kernel [%d]'s reference"
- " relocation symbol.\n", machine->pid);
- }
- static struct perf_event_header finished_round_event = {
- .size = sizeof(struct perf_event_header),
- .type = PERF_RECORD_FINISHED_ROUND,
- };
- 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");
- }
- }
- static size_t process_comp_header(void *record, size_t increment)
- {
- struct perf_record_compressed *event = record;
- size_t size = sizeof(*event);
- if (increment) {
- event->header.size += increment;
- return increment;
- }
- event->header.type = PERF_RECORD_COMPRESSED;
- event->header.size = size;
- return size;
- }
- static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
- void *src, size_t src_size)
- {
- size_t compressed;
- size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
- compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
- max_record_size, process_comp_header);
- session->bytes_transferred += src_size;
- session->bytes_compressed += compressed;
- return compressed;
- }
- static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
- bool overwrite, bool synch)
- {
- u64 bytes_written = rec->bytes_written;
- int i;
- int rc = 0;
- 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;
- if (!maps)
- 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->core.nr_mmaps; i++) {
- u64 flush = 0;
- struct mmap *map = &maps[i];
- if (map->core.base) {
- record__adjust_affinity(rec, map);
- if (synch) {
- flush = map->core.flush;
- map->core.flush = 1;
- }
- if (!record__aio_enabled(rec)) {
- if (perf_mmap__push(map, rec, record__pushfn) < 0) {
- if (synch)
- map->core.flush = flush;
- rc = -1;
- goto out;
- }
- } else {
- if (record__aio_push(rec, map, &off) < 0) {
- record__aio_set_pos(trace_fd, off);
- if (synch)
- map->core.flush = flush;
- rc = -1;
- goto out;
- }
- }
- if (synch)
- map->core.flush = flush;
- }
- if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
- !rec->opts.auxtrace_sample_mode &&
- record__auxtrace_mmap_read(rec, map) != 0) {
- 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.
- */
- if (bytes_written != rec->bytes_written)
- rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
- if (overwrite)
- perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
- out:
- return rc;
- }
- static int record__mmap_read_all(struct record *rec, bool synch)
- {
- int err;
- err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
- if (err)
- return err;
- return record__mmap_read_evlist(rec, rec->evlist, true, synch);
- }
- static void record__init_features(struct record *rec)
- {
- struct perf_session *session = rec->session;
- int feat;
- for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
- perf_header__set_feat(&session->header, feat);
- if (rec->no_buildid)
- perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
- if (!have_tracepoints(&rec->evlist->core.entries))
- perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
- if (!rec->opts.branch_stack)
- perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
- if (!rec->opts.full_auxtrace)
- perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
- if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
- perf_header__clear_feat(&session->header, HEADER_CLOCKID);
- if (!rec->opts.use_clockid)
- perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
- perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
- if (!record__comp_enabled(rec))
- perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
- perf_header__clear_feat(&session->header, HEADER_STAT);
- }
- static void
- record__finish_output(struct record *rec)
- {
- struct perf_data *data = &rec->data;
- int fd = perf_data__fd(data);
- if (data->is_pipe)
- return;
- rec->session->header.data_size += rec->bytes_written;
- data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
- if (!rec->no_buildid) {
- process_buildids(rec);
- if (rec->buildid_all)
- dsos__hit_all(rec->session);
- }
- perf_session__write_header(rec->session, rec->evlist, fd, true);
- return;
- }
- static int record__synthesize_workload(struct record *rec, bool tail)
- {
- int err;
- struct perf_thread_map *thread_map;
- if (rec->opts.tail_synthesize != tail)
- return 0;
- thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
- if (thread_map == NULL)
- return -1;
- err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
- process_synthesized_event,
- &rec->session->machines.host,
- rec->opts.sample_address);
- perf_thread_map__put(thread_map);
- return err;
- }
- static int record__synthesize(struct record *rec, bool tail);
- static int
- record__switch_output(struct record *rec, bool at_exit)
- {
- struct perf_data *data = &rec->data;
- int fd, err;
- char *new_filename;
- /* 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);
- rec->samples = 0;
- record__finish_output(rec);
- err = fetch_current_timestamp(timestamp, sizeof(timestamp));
- if (err) {
- pr_err("Failed to get current timestamp\n");
- return -EINVAL;
- }
- fd = perf_data__switch(data, timestamp,
- rec->session->header.data_offset,
- at_exit, &new_filename);
- if (fd >= 0 && !at_exit) {
- rec->bytes_written = 0;
- rec->session->header.data_size = 0;
- }
- if (!quiet)
- fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
- data->path, timestamp);
- if (rec->switch_output.num_files) {
- int n = rec->switch_output.cur_file + 1;
- if (n >= rec->switch_output.num_files)
- n = 0;
- rec->switch_output.cur_file = n;
- if (rec->switch_output.filenames[n]) {
- remove(rec->switch_output.filenames[n]);
- zfree(&rec->switch_output.filenames[n]);
- }
- rec->switch_output.filenames[n] = new_filename;
- } else {
- free(new_filename);
- }
- /* Output tracking events */
- if (!at_exit) {
- record__synthesize(rec, false);
- /*
- * In 'perf record --switch-output' without -a,
- * record__synthesize() in record__switch_output() won't
- * generate tracking events because there's no thread_map
- * in evlist. Which causes newly created perf.data doesn't
- * contain map and comm information.
- * Create a fake thread_map and directly call
- * perf_event__synthesize_thread_map() for those events.
- */
- if (target__none(&rec->opts.target))
- record__synthesize_workload(rec, false);
- }
- return fd;
- }
- static volatile int workload_exec_errno;
- /*
- * perf_evlist__prepare_workload will send a SIGUSR1
- * if the fork fails, since we asked by setting its
- * want_signal to true.
- */
- static void workload_exec_failed_signal(int signo __maybe_unused,
- siginfo_t *info,
- void *ucontext __maybe_unused)
- {
- workload_exec_errno = info->si_value.sival_int;
- done = 1;
- child_finished = 1;
- }
- static void snapshot_sig_handler(int sig);
- static void alarm_sig_handler(int sig);
- static const struct perf_event_mmap_page *
- perf_evlist__pick_pc(struct evlist *evlist)
- {
- if (evlist) {
- if (evlist->mmap && evlist->mmap[0].core.base)
- return evlist->mmap[0].core.base;
- if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
- return evlist->overwrite_mmap[0].core.base;
- }
- return NULL;
- }
- static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
- {
- const struct perf_event_mmap_page *pc;
- pc = perf_evlist__pick_pc(rec->evlist);
- if (pc)
- return pc;
- return NULL;
- }
- static int record__synthesize(struct record *rec, bool tail)
- {
- struct perf_session *session = rec->session;
- struct machine *machine = &session->machines.host;
- struct perf_data *data = &rec->data;
- struct record_opts *opts = &rec->opts;
- struct perf_tool *tool = &rec->tool;
- int fd = perf_data__fd(data);
- int err = 0;
- event_op f = process_synthesized_event;
- if (rec->opts.tail_synthesize != tail)
- return 0;
- if (data->is_pipe) {
- /*
- * We need to synthesize events first, because some
- * features works on top of them (on report side).
- */
- err = perf_event__synthesize_attrs(tool, rec->evlist,
- process_synthesized_event);
- if (err < 0) {
- pr_err("Couldn't synthesize attrs.\n");
- goto out;
- }
- err = perf_event__synthesize_features(tool, session, rec->evlist,
- process_synthesized_event);
- if (err < 0) {
- pr_err("Couldn't synthesize features.\n");
- return err;
- }
- if (have_tracepoints(&rec->evlist->core.entries)) {
- /*
- * FIXME err <= 0 here actually means that
- * there were no tracepoints so its not really
- * an error, just that we don't need to
- * synthesize anything. We really have to
- * return this more properly and also
- * propagate errors that now are calling die()
- */
- err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
- process_synthesized_event);
- if (err <= 0) {
- pr_err("Couldn't record tracing data.\n");
- goto out;
- }
- rec->bytes_written += err;
- }
- }
- err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
- process_synthesized_event, machine);
- if (err)
- goto out;
- /* Synthesize id_index before auxtrace_info */
- if (rec->opts.auxtrace_sample_mode) {
- err = perf_event__synthesize_id_index(tool,
- process_synthesized_event,
- session->evlist, machine);
- if (err)
- goto out;
- }
- if (rec->opts.full_auxtrace) {
- err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
- session, process_synthesized_event);
- if (err)
- goto out;
- }
- if (!perf_evlist__exclude_kernel(rec->evlist)) {
- err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
- machine);
- WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
- "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
- "Check /proc/kallsyms permission or run as root.\n");
- err = perf_event__synthesize_modules(tool, process_synthesized_event,
- machine);
- WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
- "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
- "Check /proc/modules permission or run as root.\n");
- }
- if (perf_guest) {
- machines__process_guests(&session->machines,
- perf_event__synthesize_guest_os, tool);
- }
- err = perf_event__synthesize_extra_attr(&rec->tool,
- rec->evlist,
- process_synthesized_event,
- data->is_pipe);
- if (err)
- goto out;
- err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
- process_synthesized_event,
- NULL);
- if (err < 0) {
- pr_err("Couldn't synthesize thread map.\n");
- return err;
- }
- err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
- process_synthesized_event, NULL);
- if (err < 0) {
- pr_err("Couldn't synthesize cpu map.\n");
- return err;
- }
- err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
- machine, opts);
- if (err < 0)
- pr_warning("Couldn't synthesize bpf events.\n");
- err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
- machine);
- if (err < 0)
- pr_warning("Couldn't synthesize cgroup events.\n");
- if (rec->opts.nr_threads_synthesize > 1) {
- perf_set_multithreaded();
- f = process_locked_synthesized_event;
- }
- err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
- f, opts->sample_address,
- rec->opts.nr_threads_synthesize);
- if (rec->opts.nr_threads_synthesize > 1)
- perf_set_singlethreaded();
- out:
- return err;
- }
- static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
- {
- struct record *rec = data;
- pthread_kill(rec->thread_id, SIGUSR2);
- return 0;
- }
- static int record__setup_sb_evlist(struct record *rec)
- {
- struct record_opts *opts = &rec->opts;
- if (rec->sb_evlist != NULL) {
- /*
- * We get here if --switch-output-event populated the
- * sb_evlist, so associate a callback that will send a SIGUSR2
- * to the main thread.
- */
- evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
- rec->thread_id = pthread_self();
- }
- #ifdef HAVE_LIBBPF_SUPPORT
- if (!opts->no_bpf_event) {
- if (rec->sb_evlist == NULL) {
- rec->sb_evlist = evlist__new();
- if (rec->sb_evlist == NULL) {
- pr_err("Couldn't create side band evlist.\n.");
- return -1;
- }
- }
- if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
- pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
- return -1;
- }
- }
- #endif
- if (perf_evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
- pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
- opts->no_bpf_event = true;
- }
- return 0;
- }
- static int record__init_clock(struct record *rec)
- {
- struct perf_session *session = rec->session;
- struct timespec ref_clockid;
- struct timeval ref_tod;
- u64 ref;
- if (!rec->opts.use_clockid)
- return 0;
- if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
- session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
- session->header.env.clock.clockid = rec->opts.clockid;
- if (gettimeofday(&ref_tod, NULL) != 0) {
- pr_err("gettimeofday failed, cannot set reference time.\n");
- return -1;
- }
- if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
- pr_err("clock_gettime failed, cannot set reference time.\n");
- return -1;
- }
- ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
- (u64) ref_tod.tv_usec * NSEC_PER_USEC;
- session->header.env.clock.tod_ns = ref;
- ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
- (u64) ref_clockid.tv_nsec;
- session->header.env.clock.clockid_ns = ref;
- return 0;
- }
- static void hit_auxtrace_snapshot_trigger(struct record *rec)
- {
- if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
- trigger_hit(&auxtrace_snapshot_trigger);
- auxtrace_record__snapshot_started = 1;
- if (auxtrace_record__snapshot_start(rec->itr))
- trigger_error(&auxtrace_snapshot_trigger);
- }
- }
- 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;
- struct perf_data *data = &rec->data;
- struct perf_session *session;
- bool disabled = false, draining = false;
- int fd;
- float ratio = 0;
- enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
- atexit(record__sig_exit);
- signal(SIGCHLD, sig_handler);
- signal(SIGINT, sig_handler);
- signal(SIGTERM, sig_handler);
- signal(SIGSEGV, sigsegv_handler);
- if (rec->opts.record_namespaces)
- tool->namespace_events = true;
- if (rec->opts.record_cgroup) {
- #ifdef HAVE_FILE_HANDLE
- tool->cgroup_events = true;
- #else
- pr_err("cgroup tracking is not supported\n");
- return -1;
- #endif
- }
- if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
- signal(SIGUSR2, snapshot_sig_handler);
- if (rec->opts.auxtrace_snapshot_mode)
- trigger_on(&auxtrace_snapshot_trigger);
- if (rec->switch_output.enabled)
- trigger_on(&switch_output_trigger);
- } else {
- signal(SIGUSR2, SIG_IGN);
- }
- session = perf_session__new(data, false, tool);
- if (IS_ERR(session)) {
- pr_err("Perf session creation failed.\n");
- return PTR_ERR(session);
- }
- fd = perf_data__fd(data);
- rec->session = session;
- if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
- pr_err("Compression initialization failed.\n");
- return -1;
- }
- #ifdef HAVE_EVENTFD_SUPPORT
- done_fd = eventfd(0, EFD_NONBLOCK);
- if (done_fd < 0) {
- pr_err("Failed to create wakeup eventfd, error: %m\n");
- status = -1;
- goto out_delete_session;
- }
- err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
- if (err < 0) {
- pr_err("Failed to add wakeup eventfd to poll list\n");
- status = err;
- goto out_delete_session;
- }
- #endif // HAVE_EVENTFD_SUPPORT
- session->header.env.comp_type = PERF_COMP_ZSTD;
- session->header.env.comp_level = rec->opts.comp_level;
- if (rec->opts.kcore &&
- !record__kcore_readable(&session->machines.host)) {
- pr_err("ERROR: kcore is not readable.\n");
- return -1;
- }
- if (record__init_clock(rec))
- return -1;
- record__init_features(rec);
- if (forks) {
- err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
- argv, data->is_pipe,
- workload_exec_failed_signal);
- if (err < 0) {
- pr_err("Couldn't run the workload!\n");
- status = err;
- goto out_delete_session;
- }
- }
- /*
- * If we have just single event and are sending data
- * through pipe, we need to force the ids allocation,
- * because we synthesize event name through the pipe
- * and need the id for that.
- */
- if (data->is_pipe && rec->evlist->core.nr_entries == 1)
- rec->opts.sample_id = true;
- if (record__open(rec) != 0) {
- err = -1;
- goto out_child;
- }
- session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
- if (rec->opts.kcore) {
- err = record__kcore_copy(&session->machines.host, data);
- if (err) {
- pr_err("ERROR: Failed to copy kcore\n");
- goto out_child;
- }
- }
- err = bpf__apply_obj_config();
- if (err) {
- char errbuf[BUFSIZ];
- bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
- pr_err("ERROR: Apply config to BPF failed: %s\n",
- errbuf);
- goto out_child;
- }
- /*
- * Normally perf_session__new would do this, but it doesn't have the
- * evlist.
- */
- if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
- pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
- rec->tool.ordered_events = false;
- }
- if (!rec->evlist->nr_groups)
- perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
- if (data->is_pipe) {
- err = perf_header__write_pipe(fd);
- if (err < 0)
- goto out_child;
- } else {
- err = perf_session__write_header(session, rec->evlist, fd, false);
- if (err < 0)
- goto out_child;
- }
- err = -1;
- if (!rec->no_buildid
- && !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;
- }
- err = record__setup_sb_evlist(rec);
- if (err)
- goto out_child;
- err = record__synthesize(rec, false);
- if (err < 0)
- goto out_child;
- if (rec->realtime_prio) {
- struct sched_param param;
- param.sched_priority = rec->realtime_prio;
- if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
- pr_err("Could not set realtime priority.\n");
- err = -1;
- goto out_child;
- }
- }
- /*
- * When perf is starting the traced process, all the events
- * (apart from group members) have enable_on_exec=1 set,
- * so don't spoil it by prematurely enabling them.
- */
- if (!target__none(&opts->target) && !opts->initial_delay)
- evlist__enable(rec->evlist);
- /*
- * Let the child rip
- */
- if (forks) {
- struct machine *machine = &session->machines.host;
- union perf_event *event;
- pid_t tgid;
- event = malloc(sizeof(event->comm) + machine->id_hdr_size);
- if (event == NULL) {
- err = -ENOMEM;
- goto out_child;
- }
- /*
- * Some H/W events are generated before COMM event
- * which is emitted during exec(), so perf script
- * cannot see a correct process name for those events.
- * Synthesize COMM event to prevent it.
- */
- tgid = perf_event__synthesize_comm(tool, event,
- rec->evlist->workload.pid,
- process_synthesized_event,
- machine);
- free(event);
- if (tgid == -1)
- goto out_child;
- event = malloc(sizeof(event->namespaces) +
- (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
- machine->id_hdr_size);
- if (event == NULL) {
- err = -ENOMEM;
- goto out_child;
- }
- /*
- * Synthesize NAMESPACES event for the command specified.
- */
- perf_event__synthesize_namespaces(tool, event,
- rec->evlist->workload.pid,
- tgid, process_synthesized_event,
- machine);
- free(event);
- perf_evlist__start_workload(rec->evlist);
- }
- if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
- goto out_child;
- if (opts->initial_delay) {
- pr_info(EVLIST_DISABLED_MSG);
- if (opts->initial_delay > 0) {
- usleep(opts->initial_delay * USEC_PER_MSEC);
- evlist__enable(rec->evlist);
- pr_info(EVLIST_ENABLED_MSG);
- }
- }
- trigger_ready(&auxtrace_snapshot_trigger);
- trigger_ready(&switch_output_trigger);
- perf_hooks__invoke_record_start();
- for (;;) {
- unsigned long long hits = rec->samples;
- /*
- * rec->evlist->bkw_mmap_state is possible to be
- * BKW_MMAP_EMPTY here: when done == true and
- * hits != rec->samples in previous round.
- *
- * perf_evlist__toggle_bkw_mmap ensure we never
- * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
- */
- if (trigger_is_hit(&switch_output_trigger) || done || draining)
- perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
- if (record__mmap_read_all(rec, false) < 0) {
- trigger_error(&auxtrace_snapshot_trigger);
- trigger_error(&switch_output_trigger);
- err = -1;
- goto out_child;
- }
- if (auxtrace_record__snapshot_started) {
- auxtrace_record__snapshot_started = 0;
- if (!trigger_is_error(&auxtrace_snapshot_trigger))
- record__read_auxtrace_snapshot(rec, false);
- if (trigger_is_error(&auxtrace_snapshot_trigger)) {
- pr_err("AUX area tracing snapshot failed\n");
- err = -1;
- goto out_child;
- }
- }
- if (trigger_is_hit(&switch_output_trigger)) {
- /*
- * If switch_output_trigger is hit, the data in
- * overwritable ring buffer should have been collected,
- * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
- *
- * If SIGUSR2 raise after or during record__mmap_read_all(),
- * record__mmap_read_all() didn't collect data from
- * overwritable ring buffer. Read again.
- */
- if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
- continue;
- trigger_ready(&switch_output_trigger);
- /*
- * Reenable events in overwrite ring buffer after
- * record__mmap_read_all(): we should have collected
- * data from it.
- */
- perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
- if (!quiet)
- fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
- waking);
- waking = 0;
- fd = record__switch_output(rec, false);
- if (fd < 0) {
- pr_err("Failed to switch to new file\n");
- trigger_error(&switch_output_trigger);
- err = fd;
- goto out_child;
- }
- /* re-arm the alarm */
- if (rec->switch_output.time)
- alarm(rec->switch_output.time);
- }
- if (hits == rec->samples) {
- if (done || draining)
- break;
- err = evlist__poll(rec->evlist, -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++;
- if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
- draining = true;
- }
- if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
- switch (cmd) {
- case EVLIST_CTL_CMD_ENABLE:
- pr_info(EVLIST_ENABLED_MSG);
- break;
- case EVLIST_CTL_CMD_DISABLE:
- pr_info(EVLIST_DISABLED_MSG);
- break;
- case EVLIST_CTL_CMD_SNAPSHOT:
- hit_auxtrace_snapshot_trigger(rec);
- evlist__ctlfd_ack(rec->evlist);
- break;
- case EVLIST_CTL_CMD_ACK:
- case EVLIST_CTL_CMD_UNSUPPORTED:
- default:
- break;
- }
- }
- /*
- * When perf is starting the traced process, at the end events
- * die with the process and we wait for that. Thus no need to
- * disable events in this case.
- */
- if (done && !disabled && !target__none(&opts->target)) {
- trigger_off(&auxtrace_snapshot_trigger);
- evlist__disable(rec->evlist);
- disabled = true;
- }
- }
- trigger_off(&auxtrace_snapshot_trigger);
- trigger_off(&switch_output_trigger);
- if (opts->auxtrace_snapshot_on_exit)
- record__auxtrace_snapshot_exit(rec);
- if (forks && workload_exec_errno) {
- char msg[STRERR_BUFSIZE];
- const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
- pr_err("Workload failed: %s\n", emsg);
- err = -1;
- goto out_child;
- }
- if (!quiet)
- fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
- if (target__none(&rec->opts.target))
- record__synthesize_workload(rec, true);
- out_child:
- evlist__finalize_ctlfd(rec->evlist);
- record__mmap_read_all(rec, true);
- record__aio_mmap_read_sync(rec);
- if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
- ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
- session->header.env.comp_ratio = ratio + 0.5;
- }
- if (forks) {
- int exit_status;
- if (!child_finished)
- kill(rec->evlist->workload.pid, SIGTERM);
- wait(&exit_status);
- if (err < 0)
- status = err;
- else if (WIFEXITED(exit_status))
- status = WEXITSTATUS(exit_status);
- else if (WIFSIGNALED(exit_status))
- signr = WTERMSIG(exit_status);
- } else
- status = err;
- record__synthesize(rec, true);
- /* this will be recalculated during process_buildids() */
- rec->samples = 0;
- if (!err) {
- if (!rec->timestamp_filename) {
- record__finish_output(rec);
- } else {
- fd = record__switch_output(rec, true);
- if (fd < 0) {
- status = fd;
- goto out_delete_session;
- }
- }
- }
- perf_hooks__invoke_record_end();
- if (!err && !quiet) {
- char samples[128];
- const char *postfix = rec->timestamp_filename ?
- ".<timestamp>" : "";
- if (rec->samples && !rec->opts.full_auxtrace)
- scnprintf(samples, sizeof(samples),
- " (%" PRIu64 " samples)", rec->samples);
- else
- samples[0] = '\0';
- fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
- perf_data__size(data) / 1024.0 / 1024.0,
- data->path, postfix, samples);
- if (ratio) {
- fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
- rec->session->bytes_transferred / 1024.0 / 1024.0,
- ratio);
- }
- fprintf(stderr, " ]\n");
- }
- out_delete_session:
- #ifdef HAVE_EVENTFD_SUPPORT
- if (done_fd >= 0)
- close(done_fd);
- #endif
- zstd_fini(&session->zstd_data);
- perf_session__delete(session);
- if (!opts->no_bpf_event)
- perf_evlist__stop_sb_thread(rec->sb_evlist);
- return status;
- }
- static void callchain_debug(struct callchain_param *callchain)
- {
- static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
- pr_debug("callchain: type %s\n", str[callchain->record_mode]);
- if (callchain->record_mode == CALLCHAIN_DWARF)
- pr_debug("callchain: stack dump size %d\n",
- callchain->dump_size);
- }
- int record_opts__parse_callchain(struct record_opts *record,
- struct callchain_param *callchain,
- const char *arg, bool unset)
- {
- int ret;
- callchain->enabled = !unset;
- /* --no-call-graph */
- if (unset) {
- callchain->record_mode = CALLCHAIN_NONE;
- pr_debug("callchain: disabled\n");
- return 0;
- }
- ret = parse_callchain_record_opt(arg, callchain);
- if (!ret) {
- /* Enable data address sampling for DWARF unwind. */
- if (callchain->record_mode == CALLCHAIN_DWARF)
- record->sample_address = true;
- callchain_debug(callchain);
- }
- return ret;
- }
- int record_parse_callchain_opt(const struct option *opt,
- const char *arg,
- int unset)
- {
- return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
- }
- int record_callchain_opt(const struct option *opt,
- const char *arg __maybe_unused,
- int unset __maybe_unused)
- {
- struct callchain_param *callchain = opt->value;
- callchain->enabled = true;
- if (callchain->record_mode == CALLCHAIN_NONE)
- callchain->record_mode = CALLCHAIN_FP;
- callchain_debug(callchain);
- return 0;
- }
- static int perf_record_config(const char *var, const char *value, void *cb)
- {
- struct record *rec = cb;
- if (!strcmp(var, "record.build-id")) {
- if (!strcmp(value, "cache"))
- rec->no_buildid_cache = false;
- else if (!strcmp(value, "no-cache"))
- rec->no_buildid_cache = true;
- else if (!strcmp(value, "skip"))
- rec->no_buildid = true;
- else
- return -1;
- return 0;
- }
- if (!strcmp(var, "record.call-graph")) {
- 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;
- }
- static int record__parse_affinity(const struct option *opt, const char *str, int unset)
- {
- struct record_opts *opts = (struct record_opts *)opt->value;
- if (unset || !str)
- return 0;
- if (!strcasecmp(str, "node"))
- opts->affinity = PERF_AFFINITY_NODE;
- else if (!strcasecmp(str, "cpu"))
- opts->affinity = PERF_AFFINITY_CPU;
- return 0;
- }
- static int parse_output_max_size(const struct option *opt,
- const char *str, int unset)
- {
- unsigned long *s = (unsigned long *)opt->value;
- static struct parse_tag tags_size[] = {
- { .tag = 'B', .mult = 1 },
- { .tag = 'K', .mult = 1 << 10 },
- { .tag = 'M', .mult = 1 << 20 },
- { .tag = 'G', .mult = 1 << 30 },
- { .tag = 0 },
- };
- unsigned long val;
- if (unset) {
- *s = 0;
- return 0;
- }
- val = parse_tag_value(str, tags_size);
- if (val != (unsigned long) -1) {
- *s = val;
- return 0;
- }
- return -1;
- }
- static int record__parse_mmap_pages(const struct option *opt,
- const char *str,
- int unset __maybe_unused)
- {
- struct record_opts *opts = opt->value;
- char *s, *p;
- unsigned int mmap_pages;
- int ret;
- if (!str)
- return -EINVAL;
- s = strdup(str);
- if (!s)
- return -ENOMEM;
- p = strchr(s, ',');
- if (p)
- *p = '\0';
- if (*s) {
- ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
- if (ret)
- goto out_free;
- opts->mmap_pages = mmap_pages;
- }
- if (!p) {
- ret = 0;
- goto out_free;
- }
- ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
- if (ret)
- goto out_free;
- opts->auxtrace_mmap_pages = mmap_pages;
- out_free:
- free(s);
- return ret;
- }
- static int parse_control_option(const struct option *opt,
- const char *str,
- int unset __maybe_unused)
- {
- struct record_opts *opts = opt->value;
- return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
- }
- static void switch_output_size_warn(struct record *rec)
- {
- u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
- struct switch_output *s = &rec->switch_output;
- wakeup_size /= 2;
- if (s->size < wakeup_size) {
- char buf[100];
- unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
- pr_warning("WARNING: switch-output data size lower than "
- "wakeup kernel buffer size (%s) "
- "expect bigger perf.data sizes\n", buf);
- }
- }
- static int switch_output_setup(struct record *rec)
- {
- struct switch_output *s = &rec->switch_output;
- static struct parse_tag tags_size[] = {
- { .tag = 'B', .mult = 1 },
- { .tag = 'K', .mult = 1 << 10 },
- { .tag = 'M', .mult = 1 << 20 },
- { .tag = 'G', .mult = 1 << 30 },
- { .tag = 0 },
- };
- static struct parse_tag tags_time[] = {
- { .tag = 's', .mult = 1 },
- { .tag = 'm', .mult = 60 },
- { .tag = 'h', .mult = 60*60 },
- { .tag = 'd', .mult = 60*60*24 },
- { .tag = 0 },
- };
- unsigned long val;
- /*
- * If we're using --switch-output-events, then we imply its
- * --switch-output=signal, as we'll send a SIGUSR2 from the side band
- * thread to its parent.
- */
- if (rec->switch_output_event_set)
- goto do_signal;
- if (!s->set)
- return 0;
- if (!strcmp(s->str, "signal")) {
- do_signal:
- s->signal = true;
- pr_debug("switch-output with SIGUSR2 signal\n");
- goto enabled;
- }
- val = parse_tag_value(s->str, tags_size);
- if (val != (unsigned long) -1) {
- s->size = val;
- pr_debug("switch-output with %s size threshold\n", s->str);
- goto enabled;
- }
- val = parse_tag_value(s->str, tags_time);
- if (val != (unsigned long) -1) {
- s->time = val;
- pr_debug("switch-output with %s time threshold (%lu seconds)\n",
- s->str, s->time);
- goto enabled;
- }
- return -1;
- enabled:
- rec->timestamp_filename = true;
- s->enabled = true;
- if (s->size && !rec->opts.no_buffering)
- switch_output_size_warn(rec);
- return 0;
- }
- static const char * const __record_usage[] = {
- "perf record [<options>] [<command>]",
- "perf record [<options>] -- <command> [<options>]",
- NULL
- };
- const char * const *record_usage = __record_usage;
- static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
- struct perf_sample *sample, struct machine *machine)
- {
- /*
- * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
- * no need to add them twice.
- */
- if (!(event->header.misc & PERF_RECORD_MISC_USER))
- return 0;
- return perf_event__process_mmap(tool, event, sample, machine);
- }
- static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
- struct perf_sample *sample, struct machine *machine)
- {
- /*
- * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
- * no need to add them twice.
- */
- if (!(event->header.misc & PERF_RECORD_MISC_USER))
- return 0;
- return perf_event__process_mmap2(tool, event, sample, machine);
- }
- /*
- * XXX Ideally would be local to cmd_record() and passed to a record__new
- * because we need to have access to it in record__exit, that is called
- * after cmd_record() exits, but since record_options need to be accessible to
- * builtin-script, leave it here.
- *
- * At least we don't ouch it in all the other functions here directly.
- *
- * Just say no to tons of global variables, sigh.
- */
- static struct record record = {
- .opts = {
- .sample_time = true,
- .mmap_pages = UINT_MAX,
- .user_freq = UINT_MAX,
- .user_interval = ULLONG_MAX,
- .freq = 4000,
- .target = {
- .uses_mmap = true,
- .default_per_cpu = true,
- },
- .mmap_flush = MMAP_FLUSH_DEFAULT,
- .nr_threads_synthesize = 1,
- .ctl_fd = -1,
- .ctl_fd_ack = -1,
- },
- .tool = {
- .sample = process_sample_event,
- .fork = perf_event__process_fork,
- .exit = perf_event__process_exit,
- .comm = perf_event__process_comm,
- .namespaces = perf_event__process_namespaces,
- .mmap = build_id__process_mmap,
- .mmap2 = build_id__process_mmap2,
- .ordered_events = true,
- },
- };
- const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
- "\n\t\t\t\tDefault: fp";
- static bool dry_run;
- /*
- * XXX Will stay a global variable till we fix builtin-script.c to stop messing
- * with it and switch to use the library functions in perf_evlist that came
- * from builtin-record.c, i.e. use record_opts,
- * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
- * using pipes, etc.
- */
- static struct option __record_options[] = {
- OPT_CALLBACK('e', "event", &record.evlist, "event",
- "event selector. use 'perf list' to list available events",
- parse_events_option),
- OPT_CALLBACK(0, "filter", &record.evlist, "filter",
- "event filter", parse_filter),
- OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
- NULL, "don't record events from perf itself",
- exclude_perf),
- OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
- "record events on existing process id"),
- OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
- "record events on existing thread id"),
- OPT_INTEGER('r', "realtime", &record.realtime_prio,
- "collect data with this RT SCHED_FIFO priority"),
- OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
- "collect data without buffering"),
- OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
- "collect raw sample records from all opened counters"),
- OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
- "system-wide collection from all CPUs"),
- OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
- "list of cpus to monitor"),
- OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
- OPT_STRING('o', "output", &record.data.path, "file",
- "output file name"),
- OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
- &record.opts.no_inherit_set,
- "child tasks do not inherit counters"),
- OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
- "synthesize non-sample events at the end of output"),
- OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
- OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
- OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
- "Fail if the specified frequency can't be used"),
- OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
- "profile at this frequency",
- record__parse_freq),
- OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
- "number of mmap data pages and AUX area tracing mmap pages",
- record__parse_mmap_pages),
- OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
- "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
- record__mmap_flush_parse),
- OPT_BOOLEAN(0, "group", &record.opts.group,
- "put the counters into a counter group"),
- OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
- NULL, "enables call-graph recording" ,
- &record_callchain_opt),
- OPT_CALLBACK(0, "call-graph", &record.opts,
- "record_mode[,record_size]", record_callchain_help,
- &record_parse_callchain_opt),
- OPT_INCR('v', "verbose", &verbose,
- "be more verbose (show counter open errors, etc)"),
- OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
- OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
- "per thread counts"),
- OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
- OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
- "Record the sample physical addresses"),
- OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
- OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
- &record.opts.sample_time_set,
- "Record the sample timestamps"),
- OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
- "Record the sample period"),
- OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
- "don't sample"),
- OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
- &record.no_buildid_cache_set,
- "do not update the buildid cache"),
- OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
- &record.no_buildid_set,
- "do not collect buildids in perf.data"),
- OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
- "monitor event in cgroup name only",
- parse_cgroups),
- OPT_INTEGER('D', "delay", &record.opts.initial_delay,
- "ms to wait before starting measurement after program start (-1: start with events disabled)"),
- OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
- OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
- "user to profile"),
- OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
- "branch any", "sample any taken branches",
- parse_branch_stack),
- OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
- "branch filter mask", "branch stack filter modes",
- parse_branch_stack),
- OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
- "sample by weight (on special events only)"),
- OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
- "sample transaction flags (special events only)"),
- OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
- "use per-thread mmaps"),
- OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
- "sample selected machine registers on interrupt,"
- " use '-I?' to list register names", parse_intr_regs),
- OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
- "sample selected machine registers on interrupt,"
- " use '--user-regs=?' to list register names", parse_user_regs),
- OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
- "Record running/enabled time of read (:S) events"),
- OPT_CALLBACK('k', "clockid", &record.opts,
- "clockid", "clockid to use for events, see clock_gettime()",
- parse_clockid),
- OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
- "opts", "AUX area tracing Snapshot Mode", ""),
- OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
- "opts", "sample AUX area", ""),
- 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"),
- OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
- "Record cgroup events"),
- OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
- &record.opts.record_switch_events_set,
- "Record context switch events"),
- OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
- "Configure all used events to run in kernel space.",
- PARSE_OPT_EXCLUSIVE),
- OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
- "Configure all used events to run in user space.",
- PARSE_OPT_EXCLUSIVE),
- OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
- "collect kernel callchains"),
- OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
- "collect user callchains"),
- OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
- "clang binary to use for compiling BPF scriptlets"),
- OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
- "options passed to clang when compiling BPF scriptlets"),
- OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
- "file", "vmlinux pathname"),
- OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
- "Record build-id of all DSOs regardless of hits"),
- OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
- "append timestamp to output filename"),
- OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
- "Record timestamp boundary (time of first/last samples)"),
- OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
- &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
- "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
- "signal"),
- OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
- "switch output event selector. use 'perf list' to list available events",
- parse_events_option_new_evlist),
- OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
- "Limit number of switch output generated files"),
- 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_CALLBACK(0, "affinity", &record.opts, "node|cpu",
- "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
- record__parse_affinity),
- #ifdef HAVE_ZSTD_SUPPORT
- OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
- "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
- record__parse_comp_level),
- #endif
- OPT_CALLBACK(0, "max-size", &record.output_max_size,
- "size", "Limit the maximum size of the output file", parse_output_max_size),
- OPT_UINTEGER(0, "num-thread-synthesize",
- &record.opts.nr_threads_synthesize,
- "number of threads to run for event synthesis"),
- #ifdef HAVE_LIBPFM
- OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
- "libpfm4 event selector. use 'perf list' to list available events",
- parse_libpfm_events_option),
- #endif
- OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
- "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
- "\t\t\t 'snapshot': AUX area tracing snapshot).\n"
- "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
- "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
- parse_control_option),
- OPT_END()
- };
- struct option *record_options = __record_options;
- int cmd_record(int argc, const char **argv)
- {
- int err;
- struct record *rec = &record;
- char errbuf[BUFSIZ];
- setlocale(LC_ALL, "");
- #ifndef HAVE_LIBBPF_SUPPORT
- # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
- set_nobuild('\0', "clang-path", true);
- set_nobuild('\0', "clang-opt", true);
- # undef set_nobuild
- #endif
- #ifndef HAVE_BPF_PROLOGUE
- # if !defined (HAVE_DWARF_SUPPORT)
- # define REASON "NO_DWARF=1"
- # elif !defined (HAVE_LIBBPF_SUPPORT)
- # define REASON "NO_LIBBPF=1"
- # else
- # define REASON "this architecture doesn't support BPF prologue"
- # endif
- # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
- set_nobuild('\0', "vmlinux", true);
- # undef set_nobuild
- # undef REASON
- #endif
- rec->opts.affinity = PERF_AFFINITY_SYS;
- rec->evlist = evlist__new();
- if (rec->evlist == NULL)
- return -ENOMEM;
- err = perf_config(perf_record_config, rec);
- if (err)
- return err;
- argc = parse_options(argc, argv, record_options, record_usage,
- PARSE_OPT_STOP_AT_NON_OPTION);
- if (quiet)
- perf_quiet_option();
- /* Make system wide (-a) the default target. */
- if (!argc && target__none(&rec->opts.target))
- rec->opts.target.system_wide = true;
- if (nr_cgroups && !rec->opts.target.system_wide) {
- usage_with_options_msg(record_usage, record_options,
- "cgroup monitoring only available in system-wide mode");
- }
- if (rec->opts.kcore)
- rec->data.is_dir = true;
- if (rec->opts.comp_level != 0) {
- pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
- rec->no_buildid = true;
- }
- if (rec->opts.record_switch_events &&
- !perf_can_record_switch_events()) {
- ui__error("kernel does not support recording context switch events\n");
- parse_options_usage(record_usage, record_options, "switch-events", 0);
- err = -EINVAL;
- goto out_opts;
- }
- if (switch_output_setup(rec)) {
- parse_options_usage(record_usage, record_options, "switch-output", 0);
- err = -EINVAL;
- goto out_opts;
- }
- if (rec->switch_output.time) {
- signal(SIGALRM, alarm_sig_handler);
- alarm(rec->switch_output.time);
- }
- if (rec->switch_output.num_files) {
- rec->switch_output.filenames = calloc(sizeof(char *),
- rec->switch_output.num_files);
- if (!rec->switch_output.filenames) {
- err = -EINVAL;
- goto out_opts;
- }
- }
- /*
- * Allow aliases to facilitate the lookup of symbols for address
- * filters. Refer to auxtrace_parse_filters().
- */
- symbol_conf.allow_aliases = true;
- symbol__init(NULL);
- if (rec->opts.affinity != PERF_AFFINITY_SYS) {
- rec->affinity_mask.nbits = cpu__max_cpu();
- rec->affinity_mask.bits = bitmap_alloc(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;
- if (dry_run)
- goto out;
- err = bpf__setup_stdout(rec->evlist);
- if (err) {
- bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
- pr_err("ERROR: Setup BPF stdout failed: %s\n",
- errbuf);
- goto out;
- }
- err = -ENOMEM;
- if (rec->no_buildid_cache || rec->no_buildid) {
- disable_buildid_cache();
- } else if (rec->switch_output.enabled) {
- /*
- * In 'perf record --switch-output', disable buildid
- * generation by default to reduce data file switching
- * overhead. Still generate buildid if they are required
- * explicitly using
- *
- * perf record --switch-output --no-no-buildid \
- * --no-no-buildid-cache
- *
- * Following code equals to:
- *
- * if ((rec->no_buildid || !rec->no_buildid_set) &&
- * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
- * disable_buildid_cache();
- */
- bool disable = true;
- if (rec->no_buildid_set && !rec->no_buildid)
- disable = false;
- if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
- disable = false;
- if (disable) {
- rec->no_buildid = true;
- rec->no_buildid_cache = true;
- disable_buildid_cache();
- }
- }
- if (record.opts.overwrite)
- record.opts.tail_synthesize = true;
- if (rec->evlist->core.nr_entries == 0 &&
- __evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
- pr_err("Not enough memory for event selector list\n");
- goto out;
- }
- if (rec->opts.target.tid && !rec->opts.no_inherit_set)
- rec->opts.no_inherit = true;
- err = target__validate(&rec->opts.target);
- if (err) {
- target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
- ui__warning("%s\n", errbuf);
- }
- err = target__parse_uid(&rec->opts.target);
- if (err) {
- int saved_errno = errno;
- target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
- ui__error("%s", errbuf);
- err = -saved_errno;
- goto out;
- }
- /* Enable ignoring missing threads when -u/-p option is defined. */
- rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
- err = -ENOMEM;
- if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
- usage_with_options(record_usage, record_options);
- err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
- if (err)
- goto out;
- /*
- * We take all buildids when the file contains
- * AUX area tracing data because we do not decode the
- * trace because it would take too long.
- */
- if (rec->opts.full_auxtrace)
- rec->buildid_all = true;
- if (rec->opts.text_poke) {
- err = record__config_text_poke(rec->evlist);
- if (err) {
- pr_err("record__config_text_poke failed, error %d\n", err);
- goto out;
- }
- }
- if (record_opts__config(&rec->opts)) {
- err = -EINVAL;
- goto out;
- }
- if (rec->opts.nr_cblocks > nr_cblocks_max)
- rec->opts.nr_cblocks = nr_cblocks_max;
- pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
- pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
- pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
- if (rec->opts.comp_level > comp_level_max)
- rec->opts.comp_level = comp_level_max;
- pr_debug("comp level: %d\n", rec->opts.comp_level);
- err = __cmd_record(&record, argc, argv);
- out:
- bitmap_free(rec->affinity_mask.bits);
- evlist__delete(rec->evlist);
- symbol__exit();
- auxtrace_record__free(rec->itr);
- out_opts:
- evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
- return err;
- }
- static void snapshot_sig_handler(int sig __maybe_unused)
- {
- struct record *rec = &record;
- hit_auxtrace_snapshot_trigger(rec);
- if (switch_output_signal(rec))
- trigger_hit(&switch_output_trigger);
- }
- static void alarm_sig_handler(int sig __maybe_unused)
- {
- struct record *rec = &record;
- if (switch_output_time(rec))
- trigger_hit(&switch_output_trigger);
- }
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