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authorNamhyung Kim <namhyung@kernel.org>2015-04-24 10:15:32 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-05-05 18:13:22 -0300
commitc8539e3fc630067020814657636b45095edfb5bb (patch)
tree2fcfbf34968411b8be0d8fea7b93285b9d260986 /tools/perf/util/pstack.c
parentea7cd59233097984850adc0e4119644f089be734 (diff)
perf tools: Introduce pstack_peek()
The pstack_peek() is to get the topmost entry without removing it. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1429838133-14001-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/pstack.c')
-rw-r--r--tools/perf/util/pstack.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/util/pstack.c b/tools/perf/util/pstack.c
index a126e6cc6e73..b234a6e3d0d4 100644
--- a/tools/perf/util/pstack.c
+++ b/tools/perf/util/pstack.c
@@ -74,3 +74,10 @@ void *pstack__pop(struct pstack *pstack)
pstack->entries[pstack->top] = NULL;
return ret;
}
+
+void *pstack__peek(struct pstack *pstack)
+{
+ if (pstack->top == 0)
+ return NULL;
+ return pstack->entries[pstack->top - 1];
+}