| /* |
| * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> |
| * |
| * Parts came from builtin-{top,stat,record}.c, see those files for further |
| * copyright notes. |
| * |
| * Released under the GPL v2. (and only v2, not any later version) |
| */ |
| #include "util.h" |
| #include <api/fs/fs.h> |
| #include <poll.h> |
| #include "cpumap.h" |
| #include "thread_map.h" |
| #include "target.h" |
| #include "evlist.h" |
| #include "evsel.h" |
| #include "debug.h" |
| #include <unistd.h> |
| |
| #include "parse-events.h" |
| #include <subcmd/parse-options.h> |
| |
| #include <sys/mman.h> |
| |
| #include <linux/bitops.h> |
| #include <linux/hash.h> |
| #include <linux/log2.h> |
| #include <linux/err.h> |
| |
| static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx); |
| static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx); |
| |
| #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
| #define SID(e, x, y) xyarray__entry(e->sample_id, x, y) |
| |
| void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus, |
| struct thread_map *threads) |
| { |
| int i; |
| |
| for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i) |
| INIT_HLIST_HEAD(&evlist->heads[i]); |
| INIT_LIST_HEAD(&evlist->entries); |
| perf_evlist__set_maps(evlist, cpus, threads); |
| fdarray__init(&evlist->pollfd, 64); |
| evlist->workload.pid = -1; |
| } |
| |
| struct perf_evlist *perf_evlist__new(void) |
| { |
| struct perf_evlist *evlist = zalloc(sizeof(*evlist)); |
| |
| if (evlist != NULL) |
| perf_evlist__init(evlist, NULL, NULL); |
| |
| return evlist; |
| } |
| |
| struct perf_evlist *perf_evlist__new_default(void) |
| { |
| struct perf_evlist *evlist = perf_evlist__new(); |
| |
| if (evlist && perf_evlist__add_default(evlist)) { |
| perf_evlist__delete(evlist); |
| evlist = NULL; |
| } |
| |
| return evlist; |
| } |
| |
| struct perf_evlist *perf_evlist__new_dummy(void) |
| { |
| struct perf_evlist *evlist = perf_evlist__new(); |
| |
| if (evlist && perf_evlist__add_dummy(evlist)) { |
| perf_evlist__delete(evlist); |
| evlist = NULL; |
| } |
| |
| return evlist; |
| } |
| |
| /** |
| * perf_evlist__set_id_pos - set the positions of event ids. |
| * @evlist: selected event list |
| * |
| * Events with compatible sample types all have the same id_pos |
| * and is_pos. For convenience, put a copy on evlist. |
| */ |
| void perf_evlist__set_id_pos(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist); |
| |
| evlist->id_pos = first->id_pos; |
| evlist->is_pos = first->is_pos; |
| } |
| |
| static void perf_evlist__update_id_pos(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| |
| evlist__for_each(evlist, evsel) |
| perf_evsel__calc_id_pos(evsel); |
| |
| perf_evlist__set_id_pos(evlist); |
| } |
| |
| static void perf_evlist__purge(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *pos, *n; |
| |
| evlist__for_each_safe(evlist, n, pos) { |
| list_del_init(&pos->node); |
| pos->evlist = NULL; |
| perf_evsel__delete(pos); |
| } |
| |
| evlist->nr_entries = 0; |
| } |
| |
| void perf_evlist__exit(struct perf_evlist *evlist) |
| { |
| zfree(&evlist->mmap); |
| fdarray__exit(&evlist->pollfd); |
| } |
| |
| void perf_evlist__delete(struct perf_evlist *evlist) |
| { |
| perf_evlist__munmap(evlist); |
| perf_evlist__close(evlist); |
| cpu_map__put(evlist->cpus); |
| thread_map__put(evlist->threads); |
| evlist->cpus = NULL; |
| evlist->threads = NULL; |
| perf_evlist__purge(evlist); |
| perf_evlist__exit(evlist); |
| free(evlist); |
| } |
| |
| static void __perf_evlist__propagate_maps(struct perf_evlist *evlist, |
| struct perf_evsel *evsel) |
| { |
| /* |
| * We already have cpus for evsel (via PMU sysfs) so |
| * keep it, if there's no target cpu list defined. |
| */ |
| if (!evsel->own_cpus || evlist->has_user_cpus) { |
| cpu_map__put(evsel->cpus); |
| evsel->cpus = cpu_map__get(evlist->cpus); |
| } else if (evsel->cpus != evsel->own_cpus) { |
| cpu_map__put(evsel->cpus); |
| evsel->cpus = cpu_map__get(evsel->own_cpus); |
| } |
| |
| thread_map__put(evsel->threads); |
| evsel->threads = thread_map__get(evlist->threads); |
| } |
| |
| static void perf_evlist__propagate_maps(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| |
| evlist__for_each(evlist, evsel) |
| __perf_evlist__propagate_maps(evlist, evsel); |
| } |
| |
| void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry) |
| { |
| entry->evlist = evlist; |
| list_add_tail(&entry->node, &evlist->entries); |
| entry->idx = evlist->nr_entries; |
| entry->tracking = !entry->idx; |
| |
| if (!evlist->nr_entries++) |
| perf_evlist__set_id_pos(evlist); |
| |
| __perf_evlist__propagate_maps(evlist, entry); |
| } |
| |
| void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel) |
| { |
| evsel->evlist = NULL; |
| list_del_init(&evsel->node); |
| evlist->nr_entries -= 1; |
| } |
| |
| void perf_evlist__splice_list_tail(struct perf_evlist *evlist, |
| struct list_head *list) |
| { |
| struct perf_evsel *evsel, *temp; |
| |
| __evlist__for_each_safe(list, temp, evsel) { |
| list_del_init(&evsel->node); |
| perf_evlist__add(evlist, evsel); |
| } |
| } |
| |
| void __perf_evlist__set_leader(struct list_head *list) |
| { |
| struct perf_evsel *evsel, *leader; |
| |
| leader = list_entry(list->next, struct perf_evsel, node); |
| evsel = list_entry(list->prev, struct perf_evsel, node); |
| |
| leader->nr_members = evsel->idx - leader->idx + 1; |
| |
| __evlist__for_each(list, evsel) { |
| evsel->leader = leader; |
| } |
| } |
| |
| void perf_evlist__set_leader(struct perf_evlist *evlist) |
| { |
| if (evlist->nr_entries) { |
| evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0; |
| __perf_evlist__set_leader(&evlist->entries); |
| } |
| } |
| |
| void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr) |
| { |
| attr->precise_ip = 3; |
| |
| while (attr->precise_ip != 0) { |
| int fd = sys_perf_event_open(attr, 0, -1, -1, 0); |
| if (fd != -1) { |
| close(fd); |
| break; |
| } |
| --attr->precise_ip; |
| } |
| } |
| |
| int perf_evlist__add_default(struct perf_evlist *evlist) |
| { |
| struct perf_event_attr attr = { |
| .type = PERF_TYPE_HARDWARE, |
| .config = PERF_COUNT_HW_CPU_CYCLES, |
| }; |
| struct perf_evsel *evsel; |
| |
| event_attr_init(&attr); |
| |
| perf_event_attr__set_max_precise_ip(&attr); |
| |
| evsel = perf_evsel__new(&attr); |
| if (evsel == NULL) |
| goto error; |
| |
| /* use asprintf() because free(evsel) assumes name is allocated */ |
| if (asprintf(&evsel->name, "cycles%.*s", |
| attr.precise_ip ? attr.precise_ip + 1 : 0, ":ppp") < 0) |
| goto error_free; |
| |
| perf_evlist__add(evlist, evsel); |
| return 0; |
| error_free: |
| perf_evsel__delete(evsel); |
| error: |
| return -ENOMEM; |
| } |
| |
| int perf_evlist__add_dummy(struct perf_evlist *evlist) |
| { |
| struct perf_event_attr attr = { |
| .type = PERF_TYPE_SOFTWARE, |
| .config = PERF_COUNT_SW_DUMMY, |
| .size = sizeof(attr), /* to capture ABI version */ |
| }; |
| struct perf_evsel *evsel = perf_evsel__new(&attr); |
| |
| if (evsel == NULL) |
| return -ENOMEM; |
| |
| perf_evlist__add(evlist, evsel); |
| return 0; |
| } |
| |
| static int perf_evlist__add_attrs(struct perf_evlist *evlist, |
| struct perf_event_attr *attrs, size_t nr_attrs) |
| { |
| struct perf_evsel *evsel, *n; |
| LIST_HEAD(head); |
| size_t i; |
| |
| for (i = 0; i < nr_attrs; i++) { |
| evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i); |
| if (evsel == NULL) |
| goto out_delete_partial_list; |
| list_add_tail(&evsel->node, &head); |
| } |
| |
| perf_evlist__splice_list_tail(evlist, &head); |
| |
| return 0; |
| |
| out_delete_partial_list: |
| __evlist__for_each_safe(&head, n, evsel) |
| perf_evsel__delete(evsel); |
| return -1; |
| } |
| |
| int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, |
| struct perf_event_attr *attrs, size_t nr_attrs) |
| { |
| size_t i; |
| |
| for (i = 0; i < nr_attrs; i++) |
| event_attr_init(attrs + i); |
| |
| return perf_evlist__add_attrs(evlist, attrs, nr_attrs); |
| } |
| |
| struct perf_evsel * |
| perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id) |
| { |
| struct perf_evsel *evsel; |
| |
| evlist__for_each(evlist, evsel) { |
| if (evsel->attr.type == PERF_TYPE_TRACEPOINT && |
| (int)evsel->attr.config == id) |
| return evsel; |
| } |
| |
| return NULL; |
| } |
| |
| struct perf_evsel * |
| perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist, |
| const char *name) |
| { |
| struct perf_evsel *evsel; |
| |
| evlist__for_each(evlist, evsel) { |
| if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) && |
| (strcmp(evsel->name, name) == 0)) |
| return evsel; |
| } |
| |
| return NULL; |
| } |
| |
| int perf_evlist__add_newtp(struct perf_evlist *evlist, |
| const char *sys, const char *name, void *handler) |
| { |
| struct perf_evsel *evsel = perf_evsel__newtp(sys, name); |
| |
| if (IS_ERR(evsel)) |
| return -1; |
| |
| evsel->handler = handler; |
| perf_evlist__add(evlist, evsel); |
| return 0; |
| } |
| |
| static int perf_evlist__nr_threads(struct perf_evlist *evlist, |
| struct perf_evsel *evsel) |
| { |
| if (evsel->system_wide) |
| return 1; |
| else |
| return thread_map__nr(evlist->threads); |
| } |
| |
| void perf_evlist__disable(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *pos; |
| |
| evlist__for_each(evlist, pos) { |
| if (!perf_evsel__is_group_leader(pos) || !pos->fd) |
| continue; |
| perf_evsel__disable(pos); |
| } |
| |
| evlist->enabled = false; |
| } |
| |
| void perf_evlist__enable(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *pos; |
| |
| evlist__for_each(evlist, pos) { |
| if (!perf_evsel__is_group_leader(pos) || !pos->fd) |
| continue; |
| perf_evsel__enable(pos); |
| } |
| |
| evlist->enabled = true; |
| } |
| |
| void perf_evlist__toggle_enable(struct perf_evlist *evlist) |
| { |
| (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist); |
| } |
| |
| int perf_evlist__disable_event(struct perf_evlist *evlist, |
| struct perf_evsel *evsel) |
| { |
| int cpu, thread, err; |
| int nr_cpus = cpu_map__nr(evlist->cpus); |
| int nr_threads = perf_evlist__nr_threads(evlist, evsel); |
| |
| if (!evsel->fd) |
| return 0; |
| |
| for (cpu = 0; cpu < nr_cpus; cpu++) { |
| for (thread = 0; thread < nr_threads; thread++) { |
| err = ioctl(FD(evsel, cpu, thread), |
| PERF_EVENT_IOC_DISABLE, 0); |
| if (err) |
| return err; |
| } |
| } |
| return 0; |
| } |
| |
| int perf_evlist__enable_event(struct perf_evlist *evlist, |
| struct perf_evsel *evsel) |
| { |
| int cpu, thread, err; |
| int nr_cpus = cpu_map__nr(evlist->cpus); |
| int nr_threads = perf_evlist__nr_threads(evlist, evsel); |
| |
| if (!evsel->fd) |
| return -EINVAL; |
| |
| for (cpu = 0; cpu < nr_cpus; cpu++) { |
| for (thread = 0; thread < nr_threads; thread++) { |
| err = ioctl(FD(evsel, cpu, thread), |
| PERF_EVENT_IOC_ENABLE, 0); |
| if (err) |
| return err; |
| } |
| } |
| return 0; |
| } |
| |
| static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist, |
| struct perf_evsel *evsel, int cpu) |
| { |
| int thread, err; |
| int nr_threads = perf_evlist__nr_threads(evlist, evsel); |
| |
| if (!evsel->fd) |
| return -EINVAL; |
| |
| for (thread = 0; thread < nr_threads; thread++) { |
| err = ioctl(FD(evsel, cpu, thread), |
| PERF_EVENT_IOC_ENABLE, 0); |
| if (err) |
| return err; |
| } |
| return 0; |
| } |
| |
| static int perf_evlist__enable_event_thread(struct perf_evlist *evlist, |
| struct perf_evsel *evsel, |
| int thread) |
| { |
| int cpu, err; |
| int nr_cpus = cpu_map__nr(evlist->cpus); |
| |
| if (!evsel->fd) |
| return -EINVAL; |
| |
| for (cpu = 0; cpu < nr_cpus; cpu++) { |
| err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0); |
| if (err) |
| return err; |
| } |
| return 0; |
| } |
| |
| int perf_evlist__enable_event_idx(struct perf_evlist *evlist, |
| struct perf_evsel *evsel, int idx) |
| { |
| bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus); |
| |
| if (per_cpu_mmaps) |
| return perf_evlist__enable_event_cpu(evlist, evsel, idx); |
| else |
| return perf_evlist__enable_event_thread(evlist, evsel, idx); |
| } |
| |
| int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
| { |
| int nr_cpus = cpu_map__nr(evlist->cpus); |
| int nr_threads = thread_map__nr(evlist->threads); |
| int nfds = 0; |
| struct perf_evsel *evsel; |
| |
| evlist__for_each(evlist, evsel) { |
| if (evsel->system_wide) |
| nfds += nr_cpus; |
| else |
| nfds += nr_cpus * nr_threads; |
| } |
| |
| if (fdarray__available_entries(&evlist->pollfd) < nfds && |
| fdarray__grow(&evlist->pollfd, nfds) < 0) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx) |
| { |
| int pos = fdarray__add(&evlist->pollfd, fd, POLLIN | POLLERR | POLLHUP); |
| /* |
| * Save the idx so that when we filter out fds POLLHUP'ed we can |
| * close the associated evlist->mmap[] entry. |
| */ |
| if (pos >= 0) { |
| evlist->pollfd.priv[pos].idx = idx; |
| |
| fcntl(fd, F_SETFL, O_NONBLOCK); |
| } |
| |
| return pos; |
| } |
| |
| int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) |
| { |
| return __perf_evlist__add_pollfd(evlist, fd, -1); |
| } |
| |
| static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd) |
| { |
| struct perf_evlist *evlist = container_of(fda, struct perf_evlist, pollfd); |
| |
| perf_evlist__mmap_put(evlist, fda->priv[fd].idx); |
| } |
| |
| int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask) |
| { |
| return fdarray__filter(&evlist->pollfd, revents_and_mask, |
| perf_evlist__munmap_filtered); |
| } |
| |
| int perf_evlist__poll(struct perf_evlist *evlist, int timeout) |
| { |
| return fdarray__poll(&evlist->pollfd, timeout); |
| } |
| |
| static void perf_evlist__id_hash(struct perf_evlist *evlist, |
| struct perf_evsel *evsel, |
| int cpu, int thread, u64 id) |
| { |
| int hash; |
| struct perf_sample_id *sid = SID(evsel, cpu, thread); |
| |
| sid->id = id; |
| sid->evsel = evsel; |
| hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS); |
| hlist_add_head(&sid->node, &evlist->heads[hash]); |
| } |
| |
| void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, |
| int cpu, int thread, u64 id) |
| { |
| perf_evlist__id_hash(evlist, evsel, cpu, thread, id); |
| evsel->id[evsel->ids++] = id; |
| } |
| |
| int perf_evlist__id_add_fd(struct perf_evlist *evlist, |
| struct perf_evsel *evsel, |
| int cpu, int thread, int fd) |
| { |
| u64 read_data[4] = { 0, }; |
| int id_idx = 1; /* The first entry is the counter value */ |
| u64 id; |
| int ret; |
| |
| ret = ioctl(fd, PERF_EVENT_IOC_ID, &id); |
| if (!ret) |
| goto add; |
| |
| if (errno != ENOTTY) |
| return -1; |
| |
| /* Legacy way to get event id.. All hail to old kernels! */ |
| |
| /* |
| * This way does not work with group format read, so bail |
| * out in that case. |
| */ |
| if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP) |
| return -1; |
| |
| if (!(evsel->attr.read_format & PERF_FORMAT_ID) || |
| read(fd, &read_data, sizeof(read_data)) == -1) |
| return -1; |
| |
| if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| ++id_idx; |
| if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| ++id_idx; |
| |
| id = read_data[id_idx]; |
| |
| add: |
| perf_evlist__id_add(evlist, evsel, cpu, thread, id); |
| return 0; |
| } |
| |
| static void perf_evlist__set_sid_idx(struct perf_evlist *evlist, |
| struct perf_evsel *evsel, int idx, int cpu, |
| int thread) |
| { |
| struct perf_sample_id *sid = SID(evsel, cpu, thread); |
| sid->idx = idx; |
| if (evlist->cpus && cpu >= 0) |
| sid->cpu = evlist->cpus->map[cpu]; |
| else |
| sid->cpu = -1; |
| if (!evsel->system_wide && evlist->threads && thread >= 0) |
| sid->tid = thread_map__pid(evlist->threads, thread); |
| else |
| sid->tid = -1; |
| } |
| |
| struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id) |
| { |
| struct hlist_head *head; |
| struct perf_sample_id *sid; |
| int hash; |
| |
| hash = hash_64(id, PERF_EVLIST__HLIST_BITS); |
| head = &evlist->heads[hash]; |
| |
| hlist_for_each_entry(sid, head, node) |
| if (sid->id == id) |
| return sid; |
| |
| return NULL; |
| } |
| |
| struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) |
| { |
| struct perf_sample_id *sid; |
| |
| if (evlist->nr_entries == 1 || !id) |
| return perf_evlist__first(evlist); |
| |
| sid = perf_evlist__id2sid(evlist, id); |
| if (sid) |
| return sid->evsel; |
| |
| if (!perf_evlist__sample_id_all(evlist)) |
| return perf_evlist__first(evlist); |
| |
| return NULL; |
| } |
| |
| struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist, |
| u64 id) |
| { |
| struct perf_sample_id *sid; |
| |
| if (!id) |
| return NULL; |
| |
| sid = perf_evlist__id2sid(evlist, id); |
| if (sid) |
| return sid->evsel; |
| |
| return NULL; |
| } |
| |
| static int perf_evlist__event2id(struct perf_evlist *evlist, |
| union perf_event *event, u64 *id) |
| { |
| const u64 *array = event->sample.array; |
| ssize_t n; |
| |
| n = (event->header.size - sizeof(event->header)) >> 3; |
| |
| if (event->header.type == PERF_RECORD_SAMPLE) { |
| if (evlist->id_pos >= n) |
| return -1; |
| *id = array[evlist->id_pos]; |
| } else { |
| if (evlist->is_pos > n) |
| return -1; |
| n -= evlist->is_pos; |
| *id = array[n]; |
| } |
| return 0; |
| } |
| |
| static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist, |
| union perf_event *event) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist); |
| struct hlist_head *head; |
| struct perf_sample_id *sid; |
| int hash; |
| u64 id; |
| |
| if (evlist->nr_entries == 1) |
| return first; |
| |
| if (!first->attr.sample_id_all && |
| event->header.type != PERF_RECORD_SAMPLE) |
| return first; |
| |
| if (perf_evlist__event2id(evlist, event, &id)) |
| return NULL; |
| |
| /* Synthesized events have an id of zero */ |
| if (!id) |
| return first; |
| |
| hash = hash_64(id, PERF_EVLIST__HLIST_BITS); |
| head = &evlist->heads[hash]; |
| |
| hlist_for_each_entry(sid, head, node) { |
| if (sid->id == id) |
| return sid->evsel; |
| } |
| return NULL; |
| } |
| |
| union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
| { |
| struct perf_mmap *md = &evlist->mmap[idx]; |
| u64 head; |
| u64 old = md->prev; |
| unsigned char *data = md->base + page_size; |
| union perf_event *event = NULL; |
| |
| /* |
| * Check if event was unmapped due to a POLLHUP/POLLERR. |
| */ |
| if (!atomic_read(&md->refcnt)) |
| return NULL; |
| |
| head = perf_mmap__read_head(md); |
| if (evlist->overwrite) { |
| /* |
| * If we're further behind than half the buffer, there's a chance |
| * the writer will bite our tail and mess up the samples under us. |
| * |
| * If we somehow ended up ahead of the head, we got messed up. |
| * |
| * In either case, truncate and restart at head. |
| */ |
| int diff = head - old; |
| if (diff > md->mask / 2 || diff < 0) { |
| fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); |
| |
| /* |
| * head points to a known good entry, start there. |
| */ |
| old = head; |
| } |
| } |
| |
| if (old != head) { |
| size_t size; |
| |
| event = (union perf_event *)&data[old & md->mask]; |
| size = event->header.size; |
| |
| /* |
| * Event straddles the mmap boundary -- header should always |
| * be inside due to u64 alignment of output. |
| */ |
| if ((old & md->mask) + size != ((old + size) & md->mask)) { |
| unsigned int offset = old; |
| unsigned int len = min(sizeof(*event), size), cpy; |
| void *dst = md->event_copy; |
| |
| do { |
| cpy = min(md->mask + 1 - (offset & md->mask), len); |
| memcpy(dst, &data[offset & md->mask], cpy); |
| offset += cpy; |
| dst += cpy; |
| len -= cpy; |
| } while (len); |
| |
| event = (union perf_event *) md->event_copy; |
| } |
| |
| old += size; |
| } |
| |
| md->prev = old; |
| |
| return event; |
| } |
| |
| static bool perf_mmap__empty(struct perf_mmap *md) |
| { |
| return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base; |
| } |
| |
| static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx) |
| { |
| atomic_inc(&evlist->mmap[idx].refcnt); |
| } |
| |
| static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx) |
| { |
| BUG_ON(atomic_read(&evlist->mmap[idx].refcnt) == 0); |
| |
| if (atomic_dec_and_test(&evlist->mmap[idx].refcnt)) |
| __perf_evlist__munmap(evlist, idx); |
| } |
| |
| void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx) |
| { |
| struct perf_mmap *md = &evlist->mmap[idx]; |
| |
| if (!evlist->overwrite) { |
| u64 old = md->prev; |
| |
| perf_mmap__write_tail(md, old); |
| } |
| |
| if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md)) |
| perf_evlist__mmap_put(evlist, idx); |
| } |
| |
| int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused, |
| struct auxtrace_mmap_params *mp __maybe_unused, |
| void *userpg __maybe_unused, |
| int fd __maybe_unused) |
| { |
| return 0; |
| } |
| |
| void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused) |
| { |
| } |
| |
| void __weak auxtrace_mmap_params__init( |
| struct auxtrace_mmap_params *mp __maybe_unused, |
| off_t auxtrace_offset __maybe_unused, |
| unsigned int auxtrace_pages __maybe_unused, |
| bool auxtrace_overwrite __maybe_unused) |
| { |
| } |
| |
| void __weak auxtrace_mmap_params__set_idx( |
| struct auxtrace_mmap_params *mp __maybe_unused, |
| struct perf_evlist *evlist __maybe_unused, |
| int idx __maybe_unused, |
| bool per_cpu __maybe_unused) |
| { |
| } |
| |
| static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx) |
| { |
| if (evlist->mmap[idx].base != NULL) { |
| munmap(evlist->mmap[idx].base, evlist->mmap_len); |
| evlist->mmap[idx].base = NULL; |
| atomic_set(&evlist->mmap[idx].refcnt, 0); |
| } |
| auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap); |
| } |
| |
| void perf_evlist__munmap(struct perf_evlist *evlist) |
| { |
| int i; |
| |
| if (evlist->mmap == NULL) |
| return; |
| |
| for (i = 0; i < evlist->nr_mmaps; i++) |
| __perf_evlist__munmap(evlist, i); |
| |
| zfree(&evlist->mmap); |
| } |
| |
| static int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
| { |
| evlist->nr_mmaps = cpu_map__nr(evlist->cpus); |
| if (cpu_map__empty(evlist->cpus)) |
| evlist->nr_mmaps = thread_map__nr(evlist->threads); |
| evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); |
| return evlist->mmap != NULL ? 0 : -ENOMEM; |
| } |
| |
| struct mmap_params { |
| int prot; |
| int mask; |
| struct auxtrace_mmap_params auxtrace_mp; |
| }; |
| |
| static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx, |
| struct mmap_params *mp, int fd) |
| { |
| /* |
| * The last one will be done at perf_evlist__mmap_consume(), so that we |
| * make sure we don't prevent tools from consuming every last event in |
| * the ring buffer. |
| * |
| * I.e. we can get the POLLHUP meaning that the fd doesn't exist |
| * anymore, but the last events for it are still in the ring buffer, |
| * waiting to be consumed. |
| * |
| * Tools can chose to ignore this at their own discretion, but the |
| * evlist layer can't just drop it when filtering events in |
| * perf_evlist__filter_pollfd(). |
| */ |
| atomic_set(&evlist->mmap[idx].refcnt, 2); |
| evlist->mmap[idx].prev = 0; |
| evlist->mmap[idx].mask = mp->mask; |
| evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot, |
| MAP_SHARED, fd, 0); |
| if (evlist->mmap[idx].base == MAP_FAILED) { |
| pr_debug2("failed to mmap perf event ring buffer, error %d\n", |
| errno); |
| evlist->mmap[idx].base = NULL; |
| return -1; |
| } |
| |
| if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap, |
| &mp->auxtrace_mp, evlist->mmap[idx].base, fd)) |
| return -1; |
| |
| return 0; |
| } |
| |
| static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, |
| struct mmap_params *mp, int cpu, |
| int thread, int *output) |
| { |
| struct perf_evsel *evsel; |
| |
| evlist__for_each(evlist, evsel) { |
| int fd; |
| |
| if (evsel->system_wide && thread) |
| continue; |
| |
| fd = FD(evsel, cpu, thread); |
| |
| if (*output == -1) { |
| *output = fd; |
| if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0) |
| return -1; |
| } else { |
| if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) |
| return -1; |
| |
| perf_evlist__mmap_get(evlist, idx); |
| } |
| |
| /* |
| * The system_wide flag causes a selected event to be opened |
| * always without a pid. Consequently it will never get a |
| * POLLHUP, but it is used for tracking in combination with |
| * other events, so it should not need to be polled anyway. |
| * Therefore don't add it for polling. |
| */ |
| if (!evsel->system_wide && |
| __perf_evlist__add_pollfd(evlist, fd, idx) < 0) { |
| perf_evlist__mmap_put(evlist, idx); |
| return -1; |
| } |
| |
| if (evsel->attr.read_format & PERF_FORMAT_ID) { |
| if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread, |
| fd) < 0) |
| return -1; |
| perf_evlist__set_sid_idx(evlist, evsel, idx, cpu, |
| thread); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, |
| struct mmap_params *mp) |
| { |
| int cpu, thread; |
| int nr_cpus = cpu_map__nr(evlist->cpus); |
| int nr_threads = thread_map__nr(evlist->threads); |
| |
| pr_debug2("perf event ring buffer mmapped per cpu\n"); |
| for (cpu = 0; cpu < nr_cpus; cpu++) { |
| int output = -1; |
| |
| auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu, |
| true); |
| |
| for (thread = 0; thread < nr_threads; thread++) { |
| if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu, |
| thread, &output)) |
| goto out_unmap; |
| } |
| } |
| |
| return 0; |
| |
| out_unmap: |
| for (cpu = 0; cpu < nr_cpus; cpu++) |
| __perf_evlist__munmap(evlist, cpu); |
| return -1; |
| } |
| |
| static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, |
| struct mmap_params *mp) |
| { |
| int thread; |
| int nr_threads = thread_map__nr(evlist->threads); |
| |
| pr_debug2("perf event ring buffer mmapped per thread\n"); |
| for (thread = 0; thread < nr_threads; thread++) { |
| int output = -1; |
| |
| auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread, |
| false); |
| |
| if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread, |
| &output)) |
| goto out_unmap; |
| } |
| |
| return 0; |
| |
| out_unmap: |
| for (thread = 0; thread < nr_threads; thread++) |
| __perf_evlist__munmap(evlist, thread); |
| return -1; |
| } |
| |
| static size_t perf_evlist__mmap_size(unsigned long pages) |
| { |
| if (pages == UINT_MAX) { |
| int max; |
| |
| if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) { |
| /* |
| * Pick a once upon a time good value, i.e. things look |
| * strange since we can't read a sysctl value, but lets not |
| * die yet... |
| */ |
| max = 512; |
| } else { |
| max -= (page_size / 1024); |
| } |
| |
| pages = (max * 1024) / page_size; |
| if (!is_power_of_2(pages)) |
| pages = rounddown_pow_of_two(pages); |
| } else if (!is_power_of_2(pages)) |
| return 0; |
| |
| return (pages + 1) * page_size; |
| } |
| |
| static long parse_pages_arg(const char *str, unsigned long min, |
| unsigned long max) |
| { |
| unsigned long pages, val; |
| 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 (str == NULL) |
| return -EINVAL; |
| |
| val = parse_tag_value(str, tags); |
| if (val != (unsigned long) -1) { |
| /* we got file size value */ |
| pages = PERF_ALIGN(val, page_size) / page_size; |
| } else { |
| /* we got pages count value */ |
| char *eptr; |
| pages = strtoul(str, &eptr, 10); |
| if (*eptr != '\0') |
| return -EINVAL; |
| } |
| |
| if (pages == 0 && min == 0) { |
| /* leave number of pages at 0 */ |
| } else if (!is_power_of_2(pages)) { |
| /* round pages up to next power of 2 */ |
| pages = roundup_pow_of_two(pages); |
| if (!pages) |
| return -EINVAL; |
| pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n", |
| pages * page_size, pages); |
| } |
| |
| if (pages > max) |
| return -EINVAL; |
| |
| return pages; |
| } |
| |
| int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str) |
| { |
| unsigned long max = UINT_MAX; |
| long pages; |
| |
| if (max > SIZE_MAX / page_size) |
| max = SIZE_MAX / page_size; |
| |
| pages = parse_pages_arg(str, 1, max); |
| if (pages < 0) { |
| pr_err("Invalid argument for --mmap_pages/-m\n"); |
| return -1; |
| } |
| |
| *mmap_pages = pages; |
| return 0; |
| } |
| |
| int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, |
| int unset __maybe_unused) |
| { |
| return __perf_evlist__parse_mmap_pages(opt->value, str); |
| } |
| |
| /** |
| * perf_evlist__mmap_ex - Create mmaps to receive events. |
| * @evlist: list of events |
| * @pages: map length in pages |
| * @overwrite: overwrite older events? |
| * @auxtrace_pages - auxtrace map length in pages |
| * @auxtrace_overwrite - overwrite older auxtrace data? |
| * |
| * If @overwrite is %false the user needs to signal event consumption using |
| * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this |
| * automatically. |
| * |
| * Similarly, if @auxtrace_overwrite is %false the user needs to signal data |
| * consumption using auxtrace_mmap__write_tail(). |
| * |
| * Return: %0 on success, negative error code otherwise. |
| */ |
| int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages, |
| bool overwrite, unsigned int auxtrace_pages, |
| bool auxtrace_overwrite) |
| { |
| struct perf_evsel *evsel; |
| const struct cpu_map *cpus = evlist->cpus; |
| const struct thread_map *threads = evlist->threads; |
| struct mmap_params mp = { |
| .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), |
| }; |
| |
| if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
| return -ENOMEM; |
| |
| if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
| return -ENOMEM; |
| |
| evlist->overwrite = overwrite; |
| evlist->mmap_len = perf_evlist__mmap_size(pages); |
| pr_debug("mmap size %zuB\n", evlist->mmap_len); |
| mp.mask = evlist->mmap_len - page_size - 1; |
| |
| auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len, |
| auxtrace_pages, auxtrace_overwrite); |
| |
| evlist__for_each(evlist, evsel) { |
| if ((evsel->attr.read_format & PERF_FORMAT_ID) && |
| evsel->sample_id == NULL && |
| perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0) |
| return -ENOMEM; |
| } |
| |
| if (cpu_map__empty(cpus)) |
| return perf_evlist__mmap_per_thread(evlist, &mp); |
| |
| return perf_evlist__mmap_per_cpu(evlist, &mp); |
| } |
| |
| int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, |
| bool overwrite) |
| { |
| return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false); |
| } |
| |
| int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target) |
| { |
| struct cpu_map *cpus; |
| struct thread_map *threads; |
| |
| threads = thread_map__new_str(target->pid, target->tid, target->uid); |
| |
| if (!threads) |
| return -1; |
| |
| if (target__uses_dummy_map(target)) |
| cpus = cpu_map__dummy_new(); |
| else |
| cpus = cpu_map__new(target->cpu_list); |
| |
| if (!cpus) |
| goto out_delete_threads; |
| |
| evlist->has_user_cpus = !!target->cpu_list; |
| |
| perf_evlist__set_maps(evlist, cpus, threads); |
| |
| return 0; |
| |
| out_delete_threads: |
| thread_map__put(threads); |
| return -1; |
| } |
| |
| void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus, |
| struct thread_map *threads) |
| { |
| /* |
| * Allow for the possibility that one or another of the maps isn't being |
| * changed i.e. don't put it. Note we are assuming the maps that are |
| * being applied are brand new and evlist is taking ownership of the |
| * original reference count of 1. If that is not the case it is up to |
| * the caller to increase the reference count. |
| */ |
| if (cpus != evlist->cpus) { |
| cpu_map__put(evlist->cpus); |
| evlist->cpus = cpus; |
| } |
| |
| if (threads != evlist->threads) { |
| thread_map__put(evlist->threads); |
| evlist->threads = threads; |
| } |
| |
| perf_evlist__propagate_maps(evlist); |
| } |
| |
| int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel) |
| { |
| struct perf_evsel *evsel; |
| int err = 0; |
| const int ncpus = cpu_map__nr(evlist->cpus), |
| nthreads = thread_map__nr(evlist->threads); |
| |
| evlist__for_each(evlist, evsel) { |
| if (evsel->filter == NULL) |
| continue; |
| |
| /* |
| * filters only work for tracepoint event, which doesn't have cpu limit. |
| * So evlist and evsel should always be same. |
| */ |
| err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter); |
| if (err) { |
| *err_evsel = evsel; |
| break; |
| } |
| } |
| |
| return err; |
| } |
| |
| int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter) |
| { |
| struct perf_evsel *evsel; |
| int err = 0; |
| |
| evlist__for_each(evlist, evsel) { |
| err = perf_evsel__set_filter(evsel, filter); |
| if (err) |
| break; |
| } |
| |
| return err; |
| } |
| |
| int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids) |
| { |
| char *filter; |
| int ret = -1; |
| size_t i; |
| |
| for (i = 0; i < npids; ++i) { |
| if (i == 0) { |
| if (asprintf(&filter, "common_pid != %d", pids[i]) < 0) |
| return -1; |
| } else { |
| char *tmp; |
| |
| if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0) |
| goto out_free; |
| |
| free(filter); |
| filter = tmp; |
| } |
| } |
| |
| ret = perf_evlist__set_filter(evlist, filter); |
| out_free: |
| free(filter); |
| return ret; |
| } |
| |
| int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid) |
| { |
| return perf_evlist__set_filter_pids(evlist, 1, &pid); |
| } |
| |
| bool perf_evlist__valid_sample_type(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *pos; |
| |
| if (evlist->nr_entries == 1) |
| return true; |
| |
| if (evlist->id_pos < 0 || evlist->is_pos < 0) |
| return false; |
| |
| evlist__for_each(evlist, pos) { |
| if (pos->id_pos != evlist->id_pos || |
| pos->is_pos != evlist->is_pos) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| |
| if (evlist->combined_sample_type) |
| return evlist->combined_sample_type; |
| |
| evlist__for_each(evlist, evsel) |
| evlist->combined_sample_type |= evsel->attr.sample_type; |
| |
| return evlist->combined_sample_type; |
| } |
| |
| u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist) |
| { |
| evlist->combined_sample_type = 0; |
| return __perf_evlist__combined_sample_type(evlist); |
| } |
| |
| u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| u64 branch_type = 0; |
| |
| evlist__for_each(evlist, evsel) |
| branch_type |= evsel->attr.branch_sample_type; |
| return branch_type; |
| } |
| |
| bool perf_evlist__valid_read_format(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
| u64 read_format = first->attr.read_format; |
| u64 sample_type = first->attr.sample_type; |
| |
| evlist__for_each(evlist, pos) { |
| if (read_format != pos->attr.read_format) |
| return false; |
| } |
| |
| /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */ |
| if ((sample_type & PERF_SAMPLE_READ) && |
| !(read_format & PERF_FORMAT_ID)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| u64 perf_evlist__read_format(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist); |
| return first->attr.read_format; |
| } |
| |
| u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist); |
| struct perf_sample *data; |
| u64 sample_type; |
| u16 size = 0; |
| |
| if (!first->attr.sample_id_all) |
| goto out; |
| |
| sample_type = first->attr.sample_type; |
| |
| if (sample_type & PERF_SAMPLE_TID) |
| size += sizeof(data->tid) * 2; |
| |
| if (sample_type & PERF_SAMPLE_TIME) |
| size += sizeof(data->time); |
| |
| if (sample_type & PERF_SAMPLE_ID) |
| size += sizeof(data->id); |
| |
| if (sample_type & PERF_SAMPLE_STREAM_ID) |
| size += sizeof(data->stream_id); |
| |
| if (sample_type & PERF_SAMPLE_CPU) |
| size += sizeof(data->cpu) * 2; |
| |
| if (sample_type & PERF_SAMPLE_IDENTIFIER) |
| size += sizeof(data->id); |
| out: |
| return size; |
| } |
| |
| bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
| |
| evlist__for_each_continue(evlist, pos) { |
| if (first->attr.sample_id_all != pos->attr.sample_id_all) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool perf_evlist__sample_id_all(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist); |
| return first->attr.sample_id_all; |
| } |
| |
| void perf_evlist__set_selected(struct perf_evlist *evlist, |
| struct perf_evsel *evsel) |
| { |
| evlist->selected = evsel; |
| } |
| |
| void perf_evlist__close(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| int ncpus = cpu_map__nr(evlist->cpus); |
| int nthreads = thread_map__nr(evlist->threads); |
| int n; |
| |
| evlist__for_each_reverse(evlist, evsel) { |
| n = evsel->cpus ? evsel->cpus->nr : ncpus; |
| perf_evsel__close(evsel, n, nthreads); |
| } |
| } |
| |
| static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist) |
| { |
| struct cpu_map *cpus; |
| struct thread_map *threads; |
| int err = -ENOMEM; |
| |
| /* |
| * Try reading /sys/devices/system/cpu/online to get |
| * an all cpus map. |
| * |
| * FIXME: -ENOMEM is the best we can do here, the cpu_map |
| * code needs an overhaul to properly forward the |
| * error, and we may not want to do that fallback to a |
| * default cpu identity map :-\ |
| */ |
| cpus = cpu_map__new(NULL); |
| if (!cpus) |
| goto out; |
| |
| threads = thread_map__new_dummy(); |
| if (!threads) |
| goto out_put; |
| |
| perf_evlist__set_maps(evlist, cpus, threads); |
| out: |
| return err; |
| out_put: |
| cpu_map__put(cpus); |
| goto out; |
| } |
| |
| int perf_evlist__open(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| int err; |
| |
| /* |
| * Default: one fd per CPU, all threads, aka systemwide |
| * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL |
| */ |
| if (evlist->threads == NULL && evlist->cpus == NULL) { |
| err = perf_evlist__create_syswide_maps(evlist); |
| if (err < 0) |
| goto out_err; |
| } |
| |
| perf_evlist__update_id_pos(evlist); |
| |
| evlist__for_each(evlist, evsel) { |
| err = perf_evsel__open(evsel, evlist->cpus, evlist->threads); |
| if (err < 0) |
| goto out_err; |
| } |
| |
| return 0; |
| out_err: |
| perf_evlist__close(evlist); |
| errno = -err; |
| return err; |
| } |
| |
| int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target, |
| const char *argv[], bool pipe_output, |
| void (*exec_error)(int signo, siginfo_t *info, void *ucontext)) |
| { |
| int child_ready_pipe[2], go_pipe[2]; |
| char bf; |
| |
| if (pipe(child_ready_pipe) < 0) { |
| perror("failed to create 'ready' pipe"); |
| return -1; |
| } |
| |
| if (pipe(go_pipe) < 0) { |
| perror("failed to create 'go' pipe"); |
| goto out_close_ready_pipe; |
| } |
| |
| evlist->workload.pid = fork(); |
| if (evlist->workload.pid < 0) { |
| perror("failed to fork"); |
| goto out_close_pipes; |
| } |
| |
| if (!evlist->workload.pid) { |
| int ret; |
| |
| if (pipe_output) |
| dup2(2, 1); |
| |
| signal(SIGTERM, SIG_DFL); |
| |
| close(child_ready_pipe[0]); |
| close(go_pipe[1]); |
| fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); |
| |
| /* |
| * Tell the parent we're ready to go |
| */ |
| close(child_ready_pipe[1]); |
| |
| /* |
| * Wait until the parent tells us to go. |
| */ |
| ret = read(go_pipe[0], &bf, 1); |
| /* |
| * The parent will ask for the execvp() to be performed by |
| * writing exactly one byte, in workload.cork_fd, usually via |
| * perf_evlist__start_workload(). |
| * |
| * For cancelling the workload without actually running it, |
| * the parent will just close workload.cork_fd, without writing |
| * anything, i.e. read will return zero and we just exit() |
| * here. |
| */ |
| if (ret != 1) { |
| if (ret == -1) |
| perror("unable to read pipe"); |
| exit(ret); |
| } |
| |
| execvp(argv[0], (char **)argv); |
| |
| if (exec_error) { |
| union sigval val; |
| |
| val.sival_int = errno; |
| if (sigqueue(getppid(), SIGUSR1, val)) |
| perror(argv[0]); |
| } else |
| perror(argv[0]); |
| exit(-1); |
| } |
| |
| if (exec_error) { |
| struct sigaction act = { |
| .sa_flags = SA_SIGINFO, |
| .sa_sigaction = exec_error, |
| }; |
| sigaction(SIGUSR1, &act, NULL); |
| } |
| |
| if (target__none(target)) { |
| if (evlist->threads == NULL) { |
| fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n", |
| __func__, __LINE__); |
| goto out_close_pipes; |
| } |
| thread_map__set_pid(evlist->threads, 0, evlist->workload.pid); |
| } |
| |
| close(child_ready_pipe[1]); |
| close(go_pipe[0]); |
| /* |
| * wait for child to settle |
| */ |
| if (read(child_ready_pipe[0], &bf, 1) == -1) { |
| perror("unable to read pipe"); |
| goto out_close_pipes; |
| } |
| |
| fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC); |
| evlist->workload.cork_fd = go_pipe[1]; |
| close(child_ready_pipe[0]); |
| return 0; |
| |
| out_close_pipes: |
| close(go_pipe[0]); |
| close(go_pipe[1]); |
| out_close_ready_pipe: |
| close(child_ready_pipe[0]); |
| close(child_ready_pipe[1]); |
| return -1; |
| } |
| |
| int perf_evlist__start_workload(struct perf_evlist *evlist) |
| { |
| if (evlist->workload.cork_fd > 0) { |
| char bf = 0; |
| int ret; |
| /* |
| * Remove the cork, let it rip! |
| */ |
| ret = write(evlist->workload.cork_fd, &bf, 1); |
| if (ret < 0) |
| perror("enable to write to pipe"); |
| |
| close(evlist->workload.cork_fd); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event, |
| struct perf_sample *sample) |
| { |
| struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event); |
| |
| if (!evsel) |
| return -EFAULT; |
| return perf_evsel__parse_sample(evsel, event, sample); |
| } |
| |
| size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp) |
| { |
| struct perf_evsel *evsel; |
| size_t printed = 0; |
| |
| evlist__for_each(evlist, evsel) { |
| printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "", |
| perf_evsel__name(evsel)); |
| } |
| |
| return printed + fprintf(fp, "\n"); |
| } |
| |
| int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, |
| int err, char *buf, size_t size) |
| { |
| int printed, value; |
| char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf)); |
| |
| switch (err) { |
| case EACCES: |
| case EPERM: |
| printed = scnprintf(buf, size, |
| "Error:\t%s.\n" |
| "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg); |
| |
| value = perf_event_paranoid(); |
| |
| printed += scnprintf(buf + printed, size - printed, "\nHint:\t"); |
| |
| if (value >= 2) { |
| printed += scnprintf(buf + printed, size - printed, |
| "For your workloads it needs to be <= 1\nHint:\t"); |
| } |
| printed += scnprintf(buf + printed, size - printed, |
| "For system wide tracing it needs to be set to -1.\n"); |
| |
| printed += scnprintf(buf + printed, size - printed, |
| "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n" |
| "Hint:\tThe current value is %d.", value); |
| break; |
| default: |
| scnprintf(buf, size, "%s", emsg); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size) |
| { |
| char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf)); |
| int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0; |
| |
| switch (err) { |
| case EPERM: |
| sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user); |
| printed += scnprintf(buf + printed, size - printed, |
| "Error:\t%s.\n" |
| "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n" |
| "Hint:\tTried using %zd kB.\n", |
| emsg, pages_max_per_user, pages_attempted); |
| |
| if (pages_attempted >= pages_max_per_user) { |
| printed += scnprintf(buf + printed, size - printed, |
| "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n", |
| pages_max_per_user + pages_attempted); |
| } |
| |
| printed += scnprintf(buf + printed, size - printed, |
| "Hint:\tTry using a smaller -m/--mmap-pages value."); |
| break; |
| default: |
| scnprintf(buf, size, "%s", emsg); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| void perf_evlist__to_front(struct perf_evlist *evlist, |
| struct perf_evsel *move_evsel) |
| { |
| struct perf_evsel *evsel, *n; |
| LIST_HEAD(move); |
| |
| if (move_evsel == perf_evlist__first(evlist)) |
| return; |
| |
| evlist__for_each_safe(evlist, n, evsel) { |
| if (evsel->leader == move_evsel->leader) |
| list_move_tail(&evsel->node, &move); |
| } |
| |
| list_splice(&move, &evlist->entries); |
| } |
| |
| void perf_evlist__set_tracking_event(struct perf_evlist *evlist, |
| struct perf_evsel *tracking_evsel) |
| { |
| struct perf_evsel *evsel; |
| |
| if (tracking_evsel->tracking) |
| return; |
| |
| evlist__for_each(evlist, evsel) { |
| if (evsel != tracking_evsel) |
| evsel->tracking = false; |
| } |
| |
| tracking_evsel->tracking = true; |
| } |