diff options
Diffstat (limited to 'tools/perf/lib/evlist.c')
-rw-r--r-- | tools/perf/lib/evlist.c | 71 |
1 files changed, 52 insertions, 19 deletions
diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c index 65045614c938..205ddbb80bc1 100644 --- a/tools/perf/lib/evlist.c +++ b/tools/perf/lib/evlist.c @@ -338,15 +338,13 @@ static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, boo int i; struct perf_mmap *map; - evlist->nr_mmaps = perf_cpu_map__nr(evlist->cpus); - if (perf_cpu_map__empty(evlist->cpus)) - evlist->nr_mmaps = perf_thread_map__nr(evlist->threads); - map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); if (!map) return NULL; for (i = 0; i < evlist->nr_mmaps; i++) { + struct perf_mmap *prev = i ? &map[i - 1] : NULL; + /* * When the perf_mmap() call is made we grab one refcount, plus * one extra to let perf_mmap__consume() get the last @@ -356,7 +354,7 @@ static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, boo * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and * thus does perf_mmap__get() on it. */ - perf_mmap__init(&map[i], overwrite, NULL); + perf_mmap__init(&map[i], prev, overwrite, NULL); } return map; @@ -382,18 +380,22 @@ static void perf_evlist__set_sid_idx(struct perf_evlist *evlist, static struct perf_mmap* perf_evlist__mmap_cb_get(struct perf_evlist *evlist, bool overwrite, int idx) { - struct perf_mmap *map = &evlist->mmap[idx]; + struct perf_mmap *maps; - if (overwrite) { - if (!evlist->mmap_ovw) { - evlist->mmap_ovw = perf_evlist__alloc_mmap(evlist, true); - if (!evlist->mmap_ovw) - return NULL; - } - map = &evlist->mmap_ovw[idx]; + maps = overwrite ? evlist->mmap_ovw : evlist->mmap; + + if (!maps) { + maps = perf_evlist__alloc_mmap(evlist, overwrite); + if (!maps) + return NULL; + + if (overwrite) + evlist->mmap_ovw = maps; + else + evlist->mmap = maps; } - return map; + return &maps[idx]; } #define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y)) @@ -405,6 +407,15 @@ perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp, return perf_mmap__mmap(map, mp, output, cpu); } +static void perf_evlist__set_mmap_first(struct perf_evlist *evlist, struct perf_mmap *map, + bool overwrite) +{ + if (overwrite) + evlist->mmap_ovw_first = map; + else + evlist->mmap_first = map; +} + static int mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, int idx, struct perf_mmap_param *mp, int cpu_idx, @@ -460,6 +471,9 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, if (ops->mmap(map, mp, *output, evlist_cpu) < 0) return -1; + + if (!idx) + perf_evlist__set_mmap_first(evlist, map, overwrite); } else { if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) return -1; @@ -542,6 +556,17 @@ out_unmap: return -1; } +static int perf_evlist__nr_mmaps(struct perf_evlist *evlist) +{ + int nr_mmaps; + + nr_mmaps = perf_cpu_map__nr(evlist->cpus); + if (perf_cpu_map__empty(evlist->cpus)) + nr_mmaps = perf_thread_map__nr(evlist->threads); + + return nr_mmaps; +} + int perf_evlist__mmap_ops(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, struct perf_mmap_param *mp) @@ -553,10 +578,9 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist, if (!ops || !ops->get || !ops->mmap) return -EINVAL; - if (!evlist->mmap) - evlist->mmap = perf_evlist__alloc_mmap(evlist, false); - if (!evlist->mmap) - return -ENOMEM; + mp->mask = evlist->mmap_len - page_size - 1; + + evlist->nr_mmaps = perf_evlist__nr_mmaps(evlist); perf_evlist__for_each_entry(evlist, evsel) { if ((evsel->attr.read_format & PERF_FORMAT_ID) && @@ -583,7 +607,6 @@ int perf_evlist__mmap(struct perf_evlist *evlist, int pages) }; evlist->mmap_len = (pages + 1) * page_size; - mp.mask = evlist->mmap_len - page_size - 1; return perf_evlist__mmap_ops(evlist, &ops, &mp); } @@ -605,3 +628,13 @@ void perf_evlist__munmap(struct perf_evlist *evlist) zfree(&evlist->mmap); zfree(&evlist->mmap_ovw); } + +struct perf_mmap* +perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map, + bool overwrite) +{ + if (map) + return map->next; + + return overwrite ? evlist->mmap_ovw_first : evlist->mmap_first; +} |