[PATCH 37/49] perf tools: Add perf_mmap__read_tail function

Jiri Olsa
2018-01-09T15:37:36Z

It will be used in following patches.

Link: http://lkml.kernel.org/n/tip-4id1fjlu5ypfqnu9kvpo7l3z@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/mmap.h | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index b14bf0040518..b6f7d4a9be01 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -78,6 +78,13 @@ static inline u64 perf_mmap__read_head(struct perf_mmap *mm)
return head;
}

+static inline u64 perf_mmap__read_tail(struct perf_mmap *md)
+{
+ struct perf_event_mmap_page *pc = md->base;
+
+ return pc->data_tail;
+}
+
static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
{
struct perf_event_mmap_page *pc = md->base;
--
2.13.6