perf evlist: Choose correct reading direction according to evlist->backward
Now we have evlist->backward to indicate the mmap direction. Make
perf_evlist__mmap_read() choose right direction automatically.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464183898-174512-3-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 58ede32..719729e 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -777,7 +777,7 @@
return event;
}
-union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
+union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int idx)
{
struct perf_mmap *md = &evlist->mmap[idx];
u64 head;
@@ -832,6 +832,13 @@
return perf_mmap__read(md, false, start, end, &md->prev);
}
+union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
+{
+ if (!evlist->backward)
+ return perf_evlist__mmap_read_forward(evlist, idx);
+ return perf_evlist__mmap_read_backward(evlist, idx);
+}
+
void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
{
struct perf_mmap *md = &evlist->mmap[idx];
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index d740fb8..68cb136 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -131,6 +131,8 @@
union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx);
+union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist,
+ int idx);
union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
int idx);
void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);