perf evlist: Record mmap cookie into fdarray private field

Insetad of saving a index into fdarray entries private field, save the
corresponding 'struct perf_mmap' pointer, and release them directly
using perf_mmap__put().

Following commits introduce multiple mmap arrays to evlist. Without this
patch, perf_evlist__munmap_filtered() is unable to retrive correct
'struct perf_mmap' pointer.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-6-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a4137e0..1462085 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -30,6 +30,7 @@
 static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
 static void perf_mmap__munmap(struct perf_mmap *map);
+static void perf_mmap__put(struct perf_mmap *map);
 
 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
@@ -466,7 +467,8 @@ int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
        return 0;
 }
 
-static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx, short revent)
+static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
+                                    struct perf_mmap *map, short revent)
 {
        int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
        /*
@@ -474,7 +476,7 @@ static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx
         * close the associated evlist->mmap[] entry.
         */
        if (pos >= 0) {
-               evlist->pollfd.priv[pos].idx = idx;
+               evlist->pollfd.priv[pos].ptr = map;
 
                fcntl(fd, F_SETFL, O_NONBLOCK);
        }
@@ -484,15 +486,16 @@ static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx
 
 int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 {
-       return __perf_evlist__add_pollfd(evlist, fd, -1, POLLIN);
+       return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
 }
 
 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
                                         void *arg __maybe_unused)
 {
-       struct perf_evlist *evlist = container_of(fda, struct perf_evlist, pollfd);
+       struct perf_mmap *map = fda->priv[fd].ptr;
 
-       perf_evlist__mmap_put(evlist, fda->priv[fd].idx);
+       if (map)
+               perf_mmap__put(map);
 }
 
 int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
@@ -1098,7 +1101,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
                 * Therefore don't add it for polling.
                 */
                if (!evsel->system_wide &&
-                   __perf_evlist__add_pollfd(evlist, fd, idx, revent) < 0) {
+                   __perf_evlist__add_pollfd(evlist, fd, &evlist->mmap[idx], revent) < 0) {
                        perf_evlist__mmap_put(evlist, idx);
                        return -1;
                }