evlist.c 20.1 KB
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/*
 * 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)
 */
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#include "util.h"
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#include <lk/debugfs.h>
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#include <poll.h>
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#include "cpumap.h"
#include "thread_map.h"
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#include "target.h"
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#include "evlist.h"
#include "evsel.h"
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#include <unistd.h>
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#include "parse-events.h"

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#include <sys/mman.h>

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#include <linux/bitops.h>
#include <linux/hash.h>

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#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
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#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
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void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
		       struct thread_map *threads)
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{
	int i;

	for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
		INIT_HLIST_HEAD(&evlist->heads[i]);
	INIT_LIST_HEAD(&evlist->entries);
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	perf_evlist__set_maps(evlist, cpus, threads);
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	evlist->workload.pid = -1;
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}

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struct perf_evlist *perf_evlist__new(void)
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{
	struct perf_evlist *evlist = zalloc(sizeof(*evlist));

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	if (evlist != NULL)
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		perf_evlist__init(evlist, NULL, NULL);
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	return evlist;
}

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void perf_evlist__config(struct perf_evlist *evlist,
			struct perf_record_opts *opts)
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{
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	struct perf_evsel *evsel;
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	/*
	 * Set the evsel leader links before we configure attributes,
	 * since some might depend on this info.
	 */
	if (opts->group)
		perf_evlist__set_leader(evlist);
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	if (evlist->cpus->map[0] < 0)
		opts->no_inherit = true;

	list_for_each_entry(evsel, &evlist->entries, node) {
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		perf_evsel__config(evsel, opts);
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		if (evlist->nr_entries > 1)
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			perf_evsel__set_sample_id(evsel);
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	}
}

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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;
}

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void perf_evlist__exit(struct perf_evlist *evlist)
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{
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	free(evlist->mmap);
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	free(evlist->pollfd);
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	evlist->mmap = NULL;
	evlist->pollfd = NULL;
}

void perf_evlist__delete(struct perf_evlist *evlist)
{
	perf_evlist__purge(evlist);
	perf_evlist__exit(evlist);
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	free(evlist);
}

void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
{
	list_add_tail(&entry->node, &evlist->entries);
	++evlist->nr_entries;
}

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void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
				   struct list_head *list,
				   int nr_entries)
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{
	list_splice_tail(list, &evlist->entries);
	evlist->nr_entries += nr_entries;
}

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void __perf_evlist__set_leader(struct list_head *list)
{
	struct perf_evsel *evsel, *leader;

	leader = list_entry(list->next, struct perf_evsel, node);
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	evsel = list_entry(list->prev, struct perf_evsel, node);

	leader->nr_members = evsel->idx - leader->idx + 1;
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	list_for_each_entry(evsel, list, node) {
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		evsel->leader = leader;
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	}
}

void perf_evlist__set_leader(struct perf_evlist *evlist)
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{
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	if (evlist->nr_entries) {
		evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
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		__perf_evlist__set_leader(&evlist->entries);
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	}
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}

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int perf_evlist__add_default(struct perf_evlist *evlist)
{
	struct perf_event_attr attr = {
		.type = PERF_TYPE_HARDWARE,
		.config = PERF_COUNT_HW_CPU_CYCLES,
	};
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	struct perf_evsel *evsel;

	event_attr_init(&attr);
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	evsel = perf_evsel__new(&attr, 0);
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	if (evsel == NULL)
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		goto error;

	/* use strdup() because free(evsel) assumes name is allocated */
	evsel->name = strdup("cycles");
	if (!evsel->name)
		goto error_free;
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	perf_evlist__add(evlist, evsel);
	return 0;
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error_free:
	perf_evsel__delete(evsel);
error:
	return -ENOMEM;
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}
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static int perf_evlist__add_attrs(struct perf_evlist *evlist,
				  struct perf_event_attr *attrs, size_t nr_attrs)
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{
	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;
}

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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);
}

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struct perf_evsel *
perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
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{
	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;
}

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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;
}

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void perf_evlist__disable(struct perf_evlist *evlist)
{
	int cpu, thread;
	struct perf_evsel *pos;
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
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	for (cpu = 0; cpu < nr_cpus; cpu++) {
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		list_for_each_entry(pos, &evlist->entries, node) {
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			if (!perf_evsel__is_group_leader(pos))
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				continue;
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			for (thread = 0; thread < nr_threads; thread++)
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				ioctl(FD(pos, cpu, thread),
				      PERF_EVENT_IOC_DISABLE, 0);
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		}
	}
}

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void perf_evlist__enable(struct perf_evlist *evlist)
{
	int cpu, thread;
	struct perf_evsel *pos;
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
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	for (cpu = 0; cpu < nr_cpus; cpu++) {
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		list_for_each_entry(pos, &evlist->entries, node) {
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			if (!perf_evsel__is_group_leader(pos))
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				continue;
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			for (thread = 0; thread < nr_threads; thread++)
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				ioctl(FD(pos, cpu, thread),
				      PERF_EVENT_IOC_ENABLE, 0);
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		}
	}
}

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static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
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{
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
	int nfds = nr_cpus * nr_threads * evlist->nr_entries;
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	evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
	return evlist->pollfd != NULL ? 0 : -ENOMEM;
}
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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++;
}
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static void perf_evlist__id_hash(struct perf_evlist *evlist,
				 struct perf_evsel *evsel,
				 int cpu, int thread, u64 id)
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{
	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]);
}

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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)
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{
	u64 read_data[4] = { 0, };
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	int id_idx = 1; /* The first entry is the counter value */
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	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;

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	perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
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	return 0;
}

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struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
{
	struct hlist_head *head;
	struct perf_sample_id *sid;
	int hash;

	if (evlist->nr_entries == 1)
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		return perf_evlist__first(evlist);
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	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
	head = &evlist->heads[hash];

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	hlist_for_each_entry(sid, head, node)
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		if (sid->id == id)
			return sid->evsel;
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	if (!perf_evlist__sample_id_all(evlist))
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		return perf_evlist__first(evlist);
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	return NULL;
}
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union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
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{
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	struct perf_mmap *md = &evlist->mmap[idx];
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	unsigned int head = perf_mmap__read_head(md);
	unsigned int old = md->prev;
	unsigned char *data = md->base + page_size;
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	union perf_event *event = NULL;
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	if (evlist->overwrite) {
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		/*
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		 * 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.
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		 */
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		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;
		}
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	}

	if (old != head) {
		size_t size;

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		event = (union perf_event *)&data[old & md->mask];
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		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;
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			void *dst = &md->event_copy;
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			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);

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			event = &md->event_copy;
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		}

		old += size;
	}

	md->prev = old;
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	if (!evlist->overwrite)
		perf_mmap__write_tail(md, old);

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	return event;
}
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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;
	}
}

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void perf_evlist__munmap(struct perf_evlist *evlist)
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{
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	int i;
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	for (i = 0; i < evlist->nr_mmaps; i++)
		__perf_evlist__munmap(evlist, i);
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	free(evlist->mmap);
	evlist->mmap = NULL;
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}

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static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
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{
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	evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
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	if (cpu_map__empty(evlist->cpus))
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		evlist->nr_mmaps = thread_map__nr(evlist->threads);
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	evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
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	return evlist->mmap != NULL ? 0 : -ENOMEM;
}

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static int __perf_evlist__mmap(struct perf_evlist *evlist,
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			       int idx, int prot, int mask, int fd)
436
{
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	evlist->mmap[idx].prev = 0;
	evlist->mmap[idx].mask = mask;
	evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
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				      MAP_SHARED, fd, 0);
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	if (evlist->mmap[idx].base == MAP_FAILED) {
		evlist->mmap[idx].base = NULL;
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		return -1;
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	}
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	perf_evlist__add_pollfd(evlist, fd);
	return 0;
}

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static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
{
	struct perf_evsel *evsel;
	int cpu, thread;
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	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
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	for (cpu = 0; cpu < nr_cpus; cpu++) {
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		int output = -1;

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		for (thread = 0; thread < nr_threads; thread++) {
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			list_for_each_entry(evsel, &evlist->entries, node) {
				int fd = FD(evsel, cpu, thread);

				if (output == -1) {
					output = fd;
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					if (__perf_evlist__mmap(evlist, cpu,
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								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:
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	for (cpu = 0; cpu < nr_cpus; cpu++)
		__perf_evlist__munmap(evlist, cpu);
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	return -1;
}

static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
{
	struct perf_evsel *evsel;
	int thread;
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	int nr_threads = thread_map__nr(evlist->threads);
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	for (thread = 0; thread < nr_threads; thread++) {
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		int output = -1;

		list_for_each_entry(evsel, &evlist->entries, node) {
			int fd = FD(evsel, 0, thread);

			if (output == -1) {
				output = fd;
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				if (__perf_evlist__mmap(evlist, thread,
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							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:
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	for (thread = 0; thread < nr_threads; thread++)
		__perf_evlist__munmap(evlist, thread);
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	return -1;
}

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/** 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)
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 *
 * Using perf_evlist__read_on_cpu does this automatically.
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 */
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int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
		      bool overwrite)
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{
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	struct perf_evsel *evsel;
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	const struct cpu_map *cpus = evlist->cpus;
	const struct thread_map *threads = evlist->threads;
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	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;
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	else if (!is_power_of_2(pages))
		return -EINVAL;
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	mask = pages * page_size - 1;
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	if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
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		return -ENOMEM;

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	if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
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		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) &&
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		    evsel->sample_id == NULL &&
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		    perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
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			return -ENOMEM;
	}

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	if (cpu_map__empty(cpus))
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		return perf_evlist__mmap_per_thread(evlist, prot, mask);
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	return perf_evlist__mmap_per_cpu(evlist, prot, mask);
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}
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int perf_evlist__create_maps(struct perf_evlist *evlist,
			     struct perf_target *target)
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{
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	evlist->threads = thread_map__new_str(target->pid, target->tid,
					      target->uid);
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	if (evlist->threads == NULL)
		return -1;

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	if (perf_target__has_task(target))
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		evlist->cpus = cpu_map__dummy_new();
N
Namhyung Kim 已提交
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	else if (!perf_target__has_cpu(target) && !target->uses_mmap)
		evlist->cpus = cpu_map__dummy_new();
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	else
		evlist->cpus = cpu_map__new(target->cpu_list);
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	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;
}
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int perf_evlist__apply_filters(struct perf_evlist *evlist)
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{
	struct perf_evsel *evsel;
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	int err = 0;
	const int ncpus = cpu_map__nr(evlist->cpus),
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		  nthreads = thread_map__nr(evlist->threads);
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	list_for_each_entry(evsel, &evlist->entries, node) {
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		if (evsel->filter == NULL)
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			continue;
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		err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
		if (err)
			break;
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	}

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	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),
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		  nthreads = thread_map__nr(evlist->threads);
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	list_for_each_entry(evsel, &evlist->entries, node) {
		err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
		if (err)
			break;
	}

	return err;
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}
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bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
648
{
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	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
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	list_for_each_entry_continue(pos, &evlist->entries, node) {
		if (first->attr.sample_type != pos->attr.sample_type)
			return false;
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	}

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	return true;
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}

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u64 perf_evlist__sample_type(struct perf_evlist *evlist)
660
{
661
	struct perf_evsel *first = perf_evlist__first(evlist);
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	return first->attr.sample_type;
}

665
u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
666
{
667
	struct perf_evsel *first = perf_evlist__first(evlist);
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694
	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;
}

695
bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
696
{
697
	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
698 699 700 701

	list_for_each_entry_continue(pos, &evlist->entries, node) {
		if (first->attr.sample_id_all != pos->attr.sample_id_all)
			return false;
702 703
	}

704 705 706
	return true;
}

707
bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
708
{
709
	struct perf_evsel *first = perf_evlist__first(evlist);
710
	return first->attr.sample_id_all;
711
}
712 713 714 715 716 717

void perf_evlist__set_selected(struct perf_evlist *evlist,
			       struct perf_evsel *evsel)
{
	evlist->selected = evsel;
}
718

719 720 721 722 723 724 725 726 727 728
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);

	list_for_each_entry_reverse(evsel, &evlist->entries, node)
		perf_evsel__close(evsel, ncpus, nthreads);
}

729
int perf_evlist__open(struct perf_evlist *evlist)
730
{
731
	struct perf_evsel *evsel;
732
	int err;
733 734

	list_for_each_entry(evsel, &evlist->entries, node) {
735
		err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
736 737 738 739 740 741
		if (err < 0)
			goto out_err;
	}

	return 0;
out_err:
742
	perf_evlist__close(evlist);
743
	errno = -err;
744 745
	return err;
}
746 747

int perf_evlist__prepare_workload(struct perf_evlist *evlist,
748
				  struct perf_target *target,
749 750
				  const char *argv[], bool pipe_output,
				  bool want_signal)
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
{
	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) {
772
		if (pipe_output)
773 774
			dup2(2, 1);

775 776
		signal(SIGTERM, SIG_DFL);

777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
		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]);
802 803
		if (want_signal)
			kill(getppid(), SIGUSR1);
804 805 806
		exit(-1);
	}

807
	if (perf_target__none(target))
808 809 810 811 812 813 814 815 816 817 818 819
		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;
	}

820
	fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
	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) {
837
		char bf = 0;
838
		int ret;
839 840 841
		/*
		 * Remove the cork, let it rip!
		 */
842 843 844 845 846 847
		ret = write(evlist->workload.cork_fd, &bf, 1);
		if (ret < 0)
			perror("enable to write to pipe");

		close(evlist->workload.cork_fd);
		return ret;
848 849 850 851
	}

	return 0;
}
852

853
int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
854
			      struct perf_sample *sample)
855
{
856
	struct perf_evsel *evsel = perf_evlist__first(evlist);
857
	return perf_evsel__parse_sample(evsel, event, sample);
858
}
859 860 861 862 863 864 865 866 867 868 869 870 871

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");;
}