perf hist: Count the total cycles of all samples

We can get the per sample cycles by hist__account_cycles(). It's also
useful to know the total cycles of all samples in order to get the
cycles coverage for a single program block in further. For example:

  coverage = per block sampled cycles / total sampled cycles

This patch creates a new argument 'total_cycles' in hist__account_cycles(),
which will be added with the cycles of each sample.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191107074719.26139-4-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index a7fa061987e4..0e27d6830011 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -2572,7 +2572,8 @@ int hists__unlink(struct hists *hists)
 }
 
 void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
-			  struct perf_sample *sample, bool nonany_branch_mode)
+			  struct perf_sample *sample, bool nonany_branch_mode,
+			  u64 *total_cycles)
 {
 	struct branch_info *bi;
 
@@ -2599,6 +2600,9 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
 					nonany_branch_mode ? NULL : prev,
 					bi[i].flags.cycles);
 				prev = &bi[i].to;
+
+				if (total_cycles)
+					*total_cycles += bi[i].flags.cycles;
 			}
 			free(bi);
 		}