perf tools: Introduce xyarray__reset function

To zero all the xyarray contents. It will be used in following patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1434269985-521-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/xyarray.c b/tools/perf/util/xyarray.c
index 22afbf6..c10ba41 100644 (file)
--- a/tools/perf/util/xyarray.c
+++ b/tools/perf/util/xyarray.c
@@ -9,11 +9,19 @@ struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size)
        if (xy != NULL) {
                xy->entry_size = entry_size;
                xy->row_size   = row_size;
+               xy->entries    = xlen * ylen;
        }
 
        return xy;
 }
 
+void xyarray__reset(struct xyarray *xy)
+{
+       size_t n = xy->entries * xy->entry_size;
+
+       memset(xy->contents, 0, n);
+}
+
 void xyarray__delete(struct xyarray *xy)
 {
        free(xy);

diff --git a/tools/perf/util/xyarray.h b/tools/perf/util/xyarray.h
index c488a07..7f30af3 100644 (file)
--- a/tools/perf/util/xyarray.h
+++ b/tools/perf/util/xyarray.h
@@ -6,11 +6,13 @@
 struct xyarray {
        size_t row_size;
        size_t entry_size;
+       size_t entries;
        char contents[];
 };
 
 struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size);
 void xyarray__delete(struct xyarray *xy);
+void xyarray__reset(struct xyarray *xy);
 
 static inline void *xyarray__entry(struct xyarray *xy, int x, int y)
 {