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.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-annotate.c

@@ -201,7 +201,7 @@ static int process_branch_callback(struct evsel *evsel,
 	if (a.map != NULL)
 		a.map->dso->hit = 1;
 
-	hist__account_cycles(sample->branch_stack, al, sample, false);
+	hist__account_cycles(sample->branch_stack, al, sample, false, NULL);
 
 	ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
 	return ret;

tools/perf/builtin-diff.c

@@ -426,7 +426,8 @@ static int diff__process_sample_event(struct perf_tool *tool,
 			goto out_put;
 		}
 
-		hist__account_cycles(sample->branch_stack, &al, sample, false);
+		hist__account_cycles(sample->branch_stack, &al, sample, false,
+				     NULL);
 	}
 
 	/*

tools/perf/builtin-report.c

@@ -292,7 +292,7 @@ static int process_sample_event(struct perf_tool *tool,
 
 	if (ui__has_annotation() || rep->symbol_ipc) {
 		hist__account_cycles(sample->branch_stack, &al, sample,
-				     rep->nonany_branch_mode);
+				     rep->nonany_branch_mode, NULL);
 	}
 
 	ret = hist_entry_iter__add(&iter, &al, rep->max_stack, rep);

tools/perf/builtin-top.c

@@ -725,7 +725,8 @@ static int hist_iter__top_callback(struct hist_entry_iter *iter,
 		perf_top__record_precise_ip(top, he, iter->sample, evsel, al->addr);
 
 	hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
-		     !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
+		     !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY),
+		     NULL);
 	return 0;
 }
 

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);
 		}

tools/perf/util/hist.h

@@ -527,7 +527,8 @@ unsigned int hists__sort_list_width(struct hists *hists);
 unsigned int hists__overhead_width(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 option;
 int parse_filter_percentage(const struct option *opt, const char *arg, int unset);