![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
So that we can reuse things like the id to attr lookup routine (perf_evlist__id2evsel) that uses a hash table instead of the linear lookup done in the older perf_header_attr routines, etc. Also to make evsels/evlist more pervasive an API, simplyfing using the emerging perf lib. cc: Arun Sharma <arun@sharma-home.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
395 lines
9.7 KiB
C
395 lines
9.7 KiB
C
/*
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* Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Parts came from builtin-{top,stat,record}.c, see those files for further
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* copyright notes.
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include <poll.h>
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#include "cpumap.h"
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#include "thread_map.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "util.h"
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#include <sys/mman.h>
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#include <linux/bitops.h>
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#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,
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struct thread_map *threads)
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{
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int i;
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for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
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INIT_HLIST_HEAD(&evlist->heads[i]);
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INIT_LIST_HEAD(&evlist->entries);
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perf_evlist__set_maps(evlist, cpus, threads);
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}
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struct perf_evlist *perf_evlist__new(struct cpu_map *cpus,
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struct thread_map *threads)
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{
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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, cpus, threads);
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return evlist;
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}
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static void perf_evlist__purge(struct perf_evlist *evlist)
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{
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struct perf_evsel *pos, *n;
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list_for_each_entry_safe(pos, n, &evlist->entries, node) {
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list_del_init(&pos->node);
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perf_evsel__delete(pos);
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}
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evlist->nr_entries = 0;
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}
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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;
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evlist->pollfd = NULL;
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}
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void perf_evlist__delete(struct perf_evlist *evlist)
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{
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perf_evlist__purge(evlist);
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perf_evlist__exit(evlist);
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free(evlist);
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}
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void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
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{
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list_add_tail(&entry->node, &evlist->entries);
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++evlist->nr_entries;
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}
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int perf_evlist__add_default(struct perf_evlist *evlist)
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{
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struct perf_event_attr attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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};
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struct perf_evsel *evsel = perf_evsel__new(&attr, 0);
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if (evsel == NULL)
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return -ENOMEM;
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perf_evlist__add(evlist, evsel);
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return 0;
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}
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int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
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{
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int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries;
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evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
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return evlist->pollfd != NULL ? 0 : -ENOMEM;
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}
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void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
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{
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fcntl(fd, F_SETFL, O_NONBLOCK);
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evlist->pollfd[evlist->nr_fds].fd = fd;
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evlist->pollfd[evlist->nr_fds].events = POLLIN;
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evlist->nr_fds++;
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}
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static void perf_evlist__id_hash(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, u64 id)
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{
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int hash;
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struct perf_sample_id *sid = SID(evsel, cpu, thread);
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sid->id = id;
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sid->evsel = evsel;
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hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
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hlist_add_head(&sid->node, &evlist->heads[hash]);
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}
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void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
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int cpu, int thread, u64 id)
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{
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perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
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evsel->id[evsel->ids++] = id;
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}
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static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, int fd)
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{
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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) ||
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read(fd, &read_data, sizeof(read_data)) == -1)
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return -1;
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if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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++id_idx;
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if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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++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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}
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struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
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{
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struct hlist_head *head;
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struct hlist_node *pos;
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struct perf_sample_id *sid;
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int hash;
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if (evlist->nr_entries == 1)
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return list_entry(evlist->entries.next, struct perf_evsel, node);
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hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
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head = &evlist->heads[hash];
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hlist_for_each_entry(sid, pos, head, node)
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if (sid->id == id)
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return sid->evsel;
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return NULL;
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}
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union perf_event *perf_evlist__read_on_cpu(struct perf_evlist *evlist, int cpu)
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{
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/* XXX Move this to perf.c, making it generally available */
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unsigned int page_size = sysconf(_SC_PAGE_SIZE);
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struct perf_mmap *md = &evlist->mmap[cpu];
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unsigned int head = perf_mmap__read_head(md);
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unsigned int old = md->prev;
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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
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* the writer will bite our tail and mess up the samples under us.
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*
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* If we somehow ended up ahead of the head, we got messed up.
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*
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* In either case, truncate and restart at head.
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*/
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int diff = head - old;
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if (diff > md->mask / 2 || diff < 0) {
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fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
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/*
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* head points to a known good entry, start there.
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*/
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old = head;
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}
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}
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if (old != head) {
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size_t size;
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event = (union perf_event *)&data[old & md->mask];
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size = event->header.size;
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/*
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* Event straddles the mmap boundary -- header should always
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* be inside due to u64 alignment of output.
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*/
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if ((old & md->mask) + size != ((old + size) & md->mask)) {
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unsigned int offset = old;
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unsigned int len = min(sizeof(*event), size), cpy;
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void *dst = &evlist->event_copy;
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do {
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cpy = min(md->mask + 1 - (offset & md->mask), len);
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memcpy(dst, &data[offset & md->mask], cpy);
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offset += cpy;
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dst += cpy;
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len -= cpy;
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} while (len);
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event = &evlist->event_copy;
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}
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old += size;
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}
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md->prev = old;
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if (!evlist->overwrite)
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perf_mmap__write_tail(md, old);
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return event;
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}
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void perf_evlist__munmap(struct perf_evlist *evlist)
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{
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int cpu;
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for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
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if (evlist->mmap[cpu].base != NULL) {
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munmap(evlist->mmap[cpu].base, evlist->mmap_len);
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evlist->mmap[cpu].base = NULL;
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}
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}
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}
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int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
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{
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evlist->mmap = zalloc(evlist->cpus->nr * sizeof(struct perf_mmap));
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return evlist->mmap != NULL ? 0 : -ENOMEM;
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}
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static int __perf_evlist__mmap(struct perf_evlist *evlist, int cpu, int prot,
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int mask, int fd)
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{
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evlist->mmap[cpu].prev = 0;
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evlist->mmap[cpu].mask = mask;
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evlist->mmap[cpu].base = mmap(NULL, evlist->mmap_len, prot,
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MAP_SHARED, fd, 0);
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if (evlist->mmap[cpu].base == MAP_FAILED)
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return -1;
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perf_evlist__add_pollfd(evlist, fd);
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return 0;
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}
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/** perf_evlist__mmap - Create per cpu maps to receive events
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*
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* @evlist - list of events
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* @pages - map length in pages
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* @overwrite - overwrite older events?
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*
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* If overwrite is false the user needs to signal event consuption using:
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*
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* struct perf_mmap *m = &evlist->mmap[cpu];
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* unsigned int head = perf_mmap__read_head(m);
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*
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* perf_mmap__write_tail(m, head)
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*
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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, int pages, bool overwrite)
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{
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unsigned int page_size = sysconf(_SC_PAGE_SIZE);
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int mask = pages * page_size - 1, cpu;
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struct perf_evsel *first_evsel, *evsel;
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const struct cpu_map *cpus = evlist->cpus;
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const struct thread_map *threads = evlist->threads;
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int thread, prot = PROT_READ | (overwrite ? 0 : PROT_WRITE);
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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;
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evlist->overwrite = overwrite;
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evlist->mmap_len = (pages + 1) * page_size;
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first_evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
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list_for_each_entry(evsel, &evlist->entries, node) {
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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, cpus->nr, threads->nr) < 0)
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return -ENOMEM;
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for (cpu = 0; cpu < cpus->nr; cpu++) {
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for (thread = 0; thread < threads->nr; thread++) {
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int fd = FD(evsel, cpu, thread);
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if (evsel->idx || thread) {
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if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT,
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FD(first_evsel, cpu, 0)) != 0)
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goto out_unmap;
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} else if (__perf_evlist__mmap(evlist, cpu, prot, mask, fd) < 0)
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goto out_unmap;
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if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
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perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
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goto out_unmap;
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}
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}
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}
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return 0;
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out_unmap:
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for (cpu = 0; cpu < cpus->nr; cpu++) {
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if (evlist->mmap[cpu].base != NULL) {
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munmap(evlist->mmap[cpu].base, evlist->mmap_len);
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evlist->mmap[cpu].base = NULL;
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}
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}
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return -1;
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}
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int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid,
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pid_t target_tid, const char *cpu_list)
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{
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evlist->threads = thread_map__new(target_pid, target_tid);
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if (evlist->threads == NULL)
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return -1;
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if (target_tid != -1)
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evlist->cpus = cpu_map__dummy_new();
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else
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evlist->cpus = cpu_map__new(cpu_list);
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if (evlist->cpus == NULL)
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goto out_delete_threads;
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return 0;
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out_delete_threads:
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thread_map__delete(evlist->threads);
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return -1;
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}
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void perf_evlist__delete_maps(struct perf_evlist *evlist)
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{
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cpu_map__delete(evlist->cpus);
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thread_map__delete(evlist->threads);
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evlist->cpus = NULL;
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evlist->threads = NULL;
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}
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int perf_evlist__set_filters(struct perf_evlist *evlist)
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{
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const struct thread_map *threads = evlist->threads;
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const struct cpu_map *cpus = evlist->cpus;
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struct perf_evsel *evsel;
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char *filter;
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int thread;
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int cpu;
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int err;
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int fd;
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list_for_each_entry(evsel, &evlist->entries, node) {
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filter = evsel->filter;
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if (!filter)
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continue;
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for (cpu = 0; cpu < cpus->nr; cpu++) {
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for (thread = 0; thread < threads->nr; thread++) {
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fd = FD(evsel, cpu, thread);
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err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
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if (err)
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return err;
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}
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}
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}
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return 0;
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}
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