| /* |
| * 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 "debugfs.h" |
| #include <poll.h> |
| #include "cpumap.h" |
| #include "thread_map.h" |
| #include "target.h" |
| #include "evlist.h" |
| #include "evsel.h" |
| #include <unistd.h> |
| |
| #include "parse-events.h" |
| |
| #include <sys/mman.h> |
| |
| #include <linux/bitops.h> |
| #include <linux/hash.h> |
| |
| #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); |
| evlist->workload.pid = -1; |
| } |
| |
| struct perf_evlist *perf_evlist__new(struct cpu_map *cpus, |
| struct thread_map *threads) |
| { |
| struct perf_evlist *evlist = zalloc(sizeof(*evlist)); |
| |
| if (evlist != NULL) |
| perf_evlist__init(evlist, cpus, threads); |
| |
| return evlist; |
| } |
| |
| void perf_evlist__config_attrs(struct perf_evlist *evlist, |
| struct perf_record_opts *opts) |
| { |
| struct perf_evsel *evsel; |
| |
| if (evlist->cpus->map[0] < 0) |
| opts->no_inherit = true; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| perf_evsel__config(evsel, opts); |
| |
| if (evlist->nr_entries > 1) |
| evsel->attr.sample_type |= PERF_SAMPLE_ID; |
| } |
| } |
| |
| static void perf_evlist__purge(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *pos, *n; |
| |
| list_for_each_entry_safe(pos, n, &evlist->entries, node) { |
| list_del_init(&pos->node); |
| perf_evsel__delete(pos); |
| } |
| |
| evlist->nr_entries = 0; |
| } |
| |
| void perf_evlist__exit(struct perf_evlist *evlist) |
| { |
| free(evlist->mmap); |
| free(evlist->pollfd); |
| evlist->mmap = NULL; |
| evlist->pollfd = NULL; |
| } |
| |
| void perf_evlist__delete(struct perf_evlist *evlist) |
| { |
| perf_evlist__purge(evlist); |
| perf_evlist__exit(evlist); |
| free(evlist); |
| } |
| |
| void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry) |
| { |
| list_add_tail(&entry->node, &evlist->entries); |
| ++evlist->nr_entries; |
| } |
| |
| void perf_evlist__splice_list_tail(struct perf_evlist *evlist, |
| struct list_head *list, |
| int nr_entries) |
| { |
| list_splice_tail(list, &evlist->entries); |
| evlist->nr_entries += nr_entries; |
| } |
| |
| void __perf_evlist__set_leader(struct list_head *list) |
| { |
| struct perf_evsel *evsel, *leader; |
| |
| leader = list_entry(list->next, struct perf_evsel, node); |
| leader->leader = NULL; |
| |
| list_for_each_entry(evsel, list, node) { |
| if (evsel != leader) |
| evsel->leader = leader; |
| } |
| } |
| |
| void perf_evlist__set_leader(struct perf_evlist *evlist) |
| { |
| if (evlist->nr_entries) |
| __perf_evlist__set_leader(&evlist->entries); |
| } |
| |
| 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); |
| |
| evsel = perf_evsel__new(&attr, 0); |
| if (evsel == NULL) |
| goto error; |
| |
| /* use strdup() because free(evsel) assumes name is allocated */ |
| evsel->name = strdup("cycles"); |
| if (!evsel->name) |
| goto error_free; |
| |
| perf_evlist__add(evlist, evsel); |
| return 0; |
| error_free: |
| perf_evsel__delete(evsel); |
| error: |
| return -ENOMEM; |
| } |
| |
| 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(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, nr_attrs); |
| |
| return 0; |
| |
| out_delete_partial_list: |
| list_for_each_entry_safe(evsel, n, &head, node) |
| 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; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| if (evsel->attr.type == PERF_TYPE_TRACEPOINT && |
| (int)evsel->attr.config == id) |
| 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; |
| |
| evsel = perf_evsel__newtp(sys, name, evlist->nr_entries); |
| if (evsel == NULL) |
| return -1; |
| |
| evsel->handler.func = handler; |
| perf_evlist__add(evlist, evsel); |
| return 0; |
| } |
| |
| void perf_evlist__disable(struct perf_evlist *evlist) |
| { |
| int cpu, thread; |
| struct perf_evsel *pos; |
| |
| for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { |
| list_for_each_entry(pos, &evlist->entries, node) { |
| if (pos->leader) |
| continue; |
| for (thread = 0; thread < evlist->threads->nr; thread++) |
| ioctl(FD(pos, cpu, thread), |
| PERF_EVENT_IOC_DISABLE, 0); |
| } |
| } |
| } |
| |
| void perf_evlist__enable(struct perf_evlist *evlist) |
| { |
| int cpu, thread; |
| struct perf_evsel *pos; |
| |
| for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) { |
| list_for_each_entry(pos, &evlist->entries, node) { |
| if (pos->leader) |
| continue; |
| for (thread = 0; thread < evlist->threads->nr; thread++) |
| ioctl(FD(pos, cpu, thread), |
| PERF_EVENT_IOC_ENABLE, 0); |
| } |
| } |
| } |
| |
| static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
| { |
| int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries; |
| evlist->pollfd = malloc(sizeof(struct pollfd) * nfds); |
| return evlist->pollfd != NULL ? 0 : -ENOMEM; |
| } |
| |
| void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) |
| { |
| fcntl(fd, F_SETFL, O_NONBLOCK); |
| evlist->pollfd[evlist->nr_fds].fd = fd; |
| evlist->pollfd[evlist->nr_fds].events = POLLIN; |
| evlist->nr_fds++; |
| } |
| |
| 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; |
| } |
| |
| static 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 */ |
| |
| 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; |
| |
| perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]); |
| return 0; |
| } |
| |
| struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) |
| { |
| struct hlist_head *head; |
| struct hlist_node *pos; |
| struct perf_sample_id *sid; |
| int hash; |
| |
| if (evlist->nr_entries == 1) |
| return perf_evlist__first(evlist); |
| |
| hash = hash_64(id, PERF_EVLIST__HLIST_BITS); |
| head = &evlist->heads[hash]; |
| |
| hlist_for_each_entry(sid, pos, head, node) |
| if (sid->id == id) |
| return sid->evsel; |
| |
| if (!perf_evlist__sample_id_all(evlist)) |
| return perf_evlist__first(evlist); |
| |
| return NULL; |
| } |
| |
| union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
| { |
| struct perf_mmap *md = &evlist->mmap[idx]; |
| unsigned int head = perf_mmap__read_head(md); |
| unsigned int old = md->prev; |
| unsigned char *data = md->base + page_size; |
| union perf_event *event = NULL; |
| |
| 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 = &evlist->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 = &evlist->event_copy; |
| } |
| |
| old += size; |
| } |
| |
| md->prev = old; |
| |
| if (!evlist->overwrite) |
| perf_mmap__write_tail(md, old); |
| |
| return event; |
| } |
| |
| void perf_evlist__munmap(struct perf_evlist *evlist) |
| { |
| int i; |
| |
| for (i = 0; i < evlist->nr_mmaps; i++) { |
| if (evlist->mmap[i].base != NULL) { |
| munmap(evlist->mmap[i].base, evlist->mmap_len); |
| evlist->mmap[i].base = NULL; |
| } |
| } |
| |
| free(evlist->mmap); |
| evlist->mmap = NULL; |
| } |
| |
| static int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
| { |
| evlist->nr_mmaps = cpu_map__nr(evlist->cpus); |
| if (cpu_map__all(evlist->cpus)) |
| evlist->nr_mmaps = evlist->threads->nr; |
| evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); |
| return evlist->mmap != NULL ? 0 : -ENOMEM; |
| } |
| |
| static int __perf_evlist__mmap(struct perf_evlist *evlist, |
| int idx, int prot, int mask, int fd) |
| { |
| evlist->mmap[idx].prev = 0; |
| evlist->mmap[idx].mask = mask; |
| evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot, |
| MAP_SHARED, fd, 0); |
| if (evlist->mmap[idx].base == MAP_FAILED) { |
| evlist->mmap[idx].base = NULL; |
| return -1; |
| } |
| |
| perf_evlist__add_pollfd(evlist, fd); |
| return 0; |
| } |
| |
| static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask) |
| { |
| struct perf_evsel *evsel; |
| int cpu, thread; |
| |
| for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { |
| int output = -1; |
| |
| for (thread = 0; thread < evlist->threads->nr; thread++) { |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| int fd = FD(evsel, cpu, thread); |
| |
| if (output == -1) { |
| output = fd; |
| if (__perf_evlist__mmap(evlist, cpu, |
| prot, mask, output) < 0) |
| goto out_unmap; |
| } else { |
| if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) |
| goto out_unmap; |
| } |
| |
| if ((evsel->attr.read_format & PERF_FORMAT_ID) && |
| perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0) |
| goto out_unmap; |
| } |
| } |
| } |
| |
| return 0; |
| |
| out_unmap: |
| for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { |
| if (evlist->mmap[cpu].base != NULL) { |
| munmap(evlist->mmap[cpu].base, evlist->mmap_len); |
| evlist->mmap[cpu].base = NULL; |
| } |
| } |
| return -1; |
| } |
| |
| static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask) |
| { |
| struct perf_evsel *evsel; |
| int thread; |
| |
| for (thread = 0; thread < evlist->threads->nr; thread++) { |
| int output = -1; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| int fd = FD(evsel, 0, thread); |
| |
| if (output == -1) { |
| output = fd; |
| if (__perf_evlist__mmap(evlist, thread, |
| prot, mask, output) < 0) |
| goto out_unmap; |
| } else { |
| if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) |
| goto out_unmap; |
| } |
| |
| if ((evsel->attr.read_format & PERF_FORMAT_ID) && |
| perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0) |
| goto out_unmap; |
| } |
| } |
| |
| return 0; |
| |
| out_unmap: |
| for (thread = 0; thread < evlist->threads->nr; thread++) { |
| if (evlist->mmap[thread].base != NULL) { |
| munmap(evlist->mmap[thread].base, evlist->mmap_len); |
| evlist->mmap[thread].base = NULL; |
| } |
| } |
| return -1; |
| } |
| |
| /** perf_evlist__mmap - Create per cpu maps to receive events |
| * |
| * @evlist - list of events |
| * @pages - map length in pages |
| * @overwrite - overwrite older events? |
| * |
| * If overwrite is false the user needs to signal event consuption using: |
| * |
| * struct perf_mmap *m = &evlist->mmap[cpu]; |
| * unsigned int head = perf_mmap__read_head(m); |
| * |
| * perf_mmap__write_tail(m, head) |
| * |
| * Using perf_evlist__read_on_cpu does this automatically. |
| */ |
| int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, |
| bool overwrite) |
| { |
| struct perf_evsel *evsel; |
| const struct cpu_map *cpus = evlist->cpus; |
| const struct thread_map *threads = evlist->threads; |
| int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask; |
| |
| /* 512 kiB: default amount of unprivileged mlocked memory */ |
| if (pages == UINT_MAX) |
| pages = (512 * 1024) / page_size; |
| else if (!is_power_of_2(pages)) |
| return -EINVAL; |
| |
| mask = pages * page_size - 1; |
| |
| if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
| return -ENOMEM; |
| |
| if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
| return -ENOMEM; |
| |
| evlist->overwrite = overwrite; |
| evlist->mmap_len = (pages + 1) * page_size; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| 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__all(cpus)) |
| return perf_evlist__mmap_per_thread(evlist, prot, mask); |
| |
| return perf_evlist__mmap_per_cpu(evlist, prot, mask); |
| } |
| |
| int perf_evlist__create_maps(struct perf_evlist *evlist, |
| struct perf_target *target) |
| { |
| evlist->threads = thread_map__new_str(target->pid, target->tid, |
| target->uid); |
| |
| if (evlist->threads == NULL) |
| return -1; |
| |
| if (perf_target__has_task(target)) |
| evlist->cpus = cpu_map__dummy_new(); |
| else if (!perf_target__has_cpu(target) && !target->uses_mmap) |
| evlist->cpus = cpu_map__dummy_new(); |
| else |
| evlist->cpus = cpu_map__new(target->cpu_list); |
| |
| if (evlist->cpus == NULL) |
| goto out_delete_threads; |
| |
| return 0; |
| |
| out_delete_threads: |
| thread_map__delete(evlist->threads); |
| return -1; |
| } |
| |
| void perf_evlist__delete_maps(struct perf_evlist *evlist) |
| { |
| cpu_map__delete(evlist->cpus); |
| thread_map__delete(evlist->threads); |
| evlist->cpus = NULL; |
| evlist->threads = NULL; |
| } |
| |
| int perf_evlist__apply_filters(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| int err = 0; |
| const int ncpus = cpu_map__nr(evlist->cpus), |
| nthreads = evlist->threads->nr; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| if (evsel->filter == NULL) |
| continue; |
| |
| err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter); |
| if (err) |
| break; |
| } |
| |
| return err; |
| } |
| |
| int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter) |
| { |
| struct perf_evsel *evsel; |
| int err = 0; |
| const int ncpus = cpu_map__nr(evlist->cpus), |
| nthreads = evlist->threads->nr; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter); |
| if (err) |
| break; |
| } |
| |
| return err; |
| } |
| |
| bool perf_evlist__valid_sample_type(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
| |
| list_for_each_entry_continue(pos, &evlist->entries, node) { |
| if (first->attr.sample_type != pos->attr.sample_type) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| u64 perf_evlist__sample_type(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist); |
| return first->attr.sample_type; |
| } |
| |
| 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; |
| out: |
| return size; |
| } |
| |
| bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
| |
| list_for_each_entry_continue(pos, &evlist->entries, node) { |
| 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; |
| } |
| |
| int perf_evlist__open(struct perf_evlist *evlist) |
| { |
| struct perf_evsel *evsel; |
| int err, ncpus, nthreads; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| err = perf_evsel__open(evsel, evlist->cpus, evlist->threads); |
| if (err < 0) |
| goto out_err; |
| } |
| |
| return 0; |
| out_err: |
| ncpus = evlist->cpus ? evlist->cpus->nr : 1; |
| nthreads = evlist->threads ? evlist->threads->nr : 1; |
| |
| list_for_each_entry_reverse(evsel, &evlist->entries, node) |
| perf_evsel__close(evsel, ncpus, nthreads); |
| |
| errno = -err; |
| return err; |
| } |
| |
| int perf_evlist__prepare_workload(struct perf_evlist *evlist, |
| struct perf_record_opts *opts, |
| const char *argv[]) |
| { |
| 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) { |
| if (opts->pipe_output) |
| dup2(2, 1); |
| |
| close(child_ready_pipe[0]); |
| close(go_pipe[1]); |
| fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); |
| |
| /* |
| * Do a dummy execvp to get the PLT entry resolved, |
| * so we avoid the resolver overhead on the real |
| * execvp call. |
| */ |
| execvp("", (char **)argv); |
| |
| /* |
| * Tell the parent we're ready to go |
| */ |
| close(child_ready_pipe[1]); |
| |
| /* |
| * Wait until the parent tells us to go. |
| */ |
| if (read(go_pipe[0], &bf, 1) == -1) |
| perror("unable to read pipe"); |
| |
| execvp(argv[0], (char **)argv); |
| |
| perror(argv[0]); |
| kill(getppid(), SIGUSR1); |
| exit(-1); |
| } |
| |
| if (perf_target__none(&opts->target)) |
| evlist->threads->map[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; |
| } |
| |
| 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) { |
| /* |
| * Remove the cork, let it rip! |
| */ |
| return close(evlist->workload.cork_fd); |
| } |
| |
| 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__first(evlist); |
| 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; |
| |
| list_for_each_entry(evsel, &evlist->entries, node) { |
| printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "", |
| perf_evsel__name(evsel)); |
| } |
| |
| return printed + fprintf(fp, "\n");; |
| } |