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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>
This commit is contained in:
Jiri Olsa 2015-06-14 10:19:16 +02:00 committed by Arnaldo Carvalho de Melo
parent ba7ecb02e7
commit b45f65e8fd
2 changed files with 10 additions and 0 deletions
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8
tools/perf/util/xyarray.c
View File

@ -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);

2
tools/perf/util/xyarray.h
View File

@ -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)
{