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Commit c8539e3f authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Introduce pstack_peek() 



The pstack_peek() is to get the topmost entry without removing it.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Acked-by: default avatarJiri 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ea7cd592

tools/perf/util/pstack.c

+7 −0
Original line number Diff line number Diff line
@@ -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];

}

tools/perf/util/pstack.h

+1 −0
Original line number Diff line number Diff line
@@ -10,5 +10,6 @@ bool pstack__empty(const struct pstack *pstack); 
void pstack__remove(struct pstack *pstack, void *key);

void pstack__push(struct pstack *pstack, void *key);

void *pstack__pop(struct pstack *pstack);

void *pstack__peek(struct pstack *pstack);



#endif /* _PERF_PSTACK_ */