summaryrefslogtreecommitdiffstats
path: root/tools/lib/perf/mmap.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/lib/perf/mmap.c')
-rw-r--r--tools/lib/perf/mmap.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/tools/lib/perf/mmap.c b/tools/lib/perf/mmap.c
index 2184814b37..0c903c2372 100644
--- a/tools/lib/perf/mmap.c
+++ b/tools/lib/perf/mmap.c
@@ -19,6 +19,7 @@
void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
bool overwrite, libperf_unmap_cb_t unmap_cb)
{
+ /* Assume fields were zero initialized. */
map->fd = -1;
map->overwrite = overwrite;
map->unmap_cb = unmap_cb;
@@ -51,13 +52,18 @@ int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
void perf_mmap__munmap(struct perf_mmap *map)
{
- if (map && map->base != NULL) {
+ if (!map)
+ return;
+
+ zfree(&map->event_copy);
+ map->event_copy_sz = 0;
+ if (map->base) {
munmap(map->base, perf_mmap__mmap_len(map));
map->base = NULL;
map->fd = -1;
refcount_set(&map->refcnt, 0);
}
- if (map && map->unmap_cb)
+ if (map->unmap_cb)
map->unmap_cb(map);
}
@@ -223,9 +229,17 @@ static union perf_event *perf_mmap__read(struct perf_mmap *map,
*/
if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {
unsigned int offset = *startp;
- unsigned int len = min(sizeof(*event), size), cpy;
+ unsigned int len = size, cpy;
void *dst = map->event_copy;
+ if (size > map->event_copy_sz) {
+ dst = realloc(map->event_copy, size);
+ if (!dst)
+ return NULL;
+ map->event_copy = dst;
+ map->event_copy_sz = size;
+ }
+
do {
cpy = min(map->mask + 1 - (offset & map->mask), len);
memcpy(dst, &data[offset & map->mask], cpy);