perf c2c report: Display total HITMs on default

Currently we display the cacheline list sorted on remote HITMs by
default.

The problem is that they might not be always counted and 'perf c2c
report' displays an empty output. Thus it's more convenient to display
and sort the cacheline list based on the total of HITMs and have the
best change to see data in the default report run.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1479764011-10732-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-c2c.txt

@@ -104,6 +104,10 @@ REPORT OPTIONS
 --force::
 	Don't do ownership validation.
 
+-d::
+--display::
+	Siwtch to HITM type (rmt, lcl) to display and sort on. Total HITMs as default.
+
 C2C RECORD
 ----------
 The perf c2c record command setup options related to HITM cacheline analysis

tools/perf/builtin-c2c.c

@@ -91,6 +91,14 @@ struct perf_c2c {
 enum {
 	DISPLAY_LCL,
 	DISPLAY_RMT,
+	DISPLAY_TOT,
+	DISPLAY_MAX,
+};
+
+static const char *display_str[DISPLAY_MAX] = {
+	[DISPLAY_LCL] = "Local",
+	[DISPLAY_RMT] = "Remote",
+	[DISPLAY_TOT] = "Total",
 };
 
 static struct perf_c2c c2c;
@@ -745,6 +753,10 @@ static double percent_hitm(struct c2c_hist_entry *c2c_he)
 	case DISPLAY_LCL:
 		st  = stats->lcl_hitm;
 		tot = total->lcl_hitm;
+		break;
+	case DISPLAY_TOT:
+		st  = stats->tot_hitm;
+		tot = total->tot_hitm;
 	default:
 		break;
 	}
@@ -1044,6 +1056,9 @@ node_entry(struct perf_hpp_fmt *fmt __maybe_unused, struct perf_hpp *hpp,
 				break;
 			case DISPLAY_LCL:
 				DISPLAY_HITM(lcl_hitm);
+				break;
+			case DISPLAY_TOT:
+				DISPLAY_HITM(tot_hitm);
 			default:
 				break;
 			}
@@ -1351,6 +1366,7 @@ static struct c2c_dimension dim_tot_loads = {
 static struct c2c_header percent_hitm_header[] = {
 	[DISPLAY_LCL] = HEADER_BOTH("Lcl", "Hitm"),
 	[DISPLAY_RMT] = HEADER_BOTH("Rmt", "Hitm"),
+	[DISPLAY_TOT] = HEADER_BOTH("Tot", "Hitm"),
 };
 
 static struct c2c_dimension dim_percent_hitm = {
@@ -1794,6 +1810,9 @@ static bool he__display(struct hist_entry *he, struct c2c_stats *stats)
 		break;
 	case DISPLAY_RMT:
 		FILTER_HITM(rmt_hitm);
+		break;
+	case DISPLAY_TOT:
+		FILTER_HITM(tot_hitm);
 	default:
 		break;
 	};
@@ -1809,8 +1828,9 @@ static inline int valid_hitm_or_store(struct hist_entry *he)
 	bool has_hitm;
 
 	c2c_he = container_of(he, struct c2c_hist_entry, he);
-	has_hitm = c2c.display == DISPLAY_LCL ?
-		   c2c_he->stats.lcl_hitm : c2c_he->stats.rmt_hitm;
+	has_hitm = c2c.display == DISPLAY_TOT ? c2c_he->stats.tot_hitm :
+		   c2c.display == DISPLAY_LCL ? c2c_he->stats.lcl_hitm :
+						c2c_he->stats.rmt_hitm;
 	return has_hitm || c2c_he->stats.store;
 }
 
@@ -2095,7 +2115,7 @@ static void print_c2c_info(FILE *out, struct perf_session *session)
 		first = false;
 	}
 	fprintf(out, "  Cachelines sort on                : %s HITMs\n",
-		c2c.display == DISPLAY_LCL ? "Local" : "Remote");
+		display_str[c2c.display]);
 	fprintf(out, "  Cacheline data grouping           : %s\n", c2c.cl_sort);
 }
 
@@ -2250,7 +2270,7 @@ static int perf_c2c_browser__title(struct hist_browser *browser,
 		  "Shared Data Cache Line Table     "
 		  "(%lu entries, sorted on %s HITMs)",
 		  browser->nr_non_filtered_entries,
-		  c2c.display == DISPLAY_LCL ? "local" : "remote");
+		  display_str[c2c.display]);
 	return 0;
 }
 
@@ -2387,9 +2407,11 @@ static int setup_callchain(struct perf_evlist *evlist)
 
 static int setup_display(const char *str)
 {
-	const char *display = str ?: "rmt";
+	const char *display = str ?: "tot";
 
-	if (!strcmp(display, "rmt"))
+	if (!strcmp(display, "tot"))
+		c2c.display = DISPLAY_TOT;
+	else if (!strcmp(display, "rmt"))
 		c2c.display = DISPLAY_RMT;
 	else if (!strcmp(display, "lcl"))
 		c2c.display = DISPLAY_LCL;
@@ -2474,6 +2496,8 @@ static int setup_coalesce(const char *coalesce, bool no_source)
 		return -1;
 
 	if (asprintf(&c2c.cl_resort, "offset,%s",
+		     c2c.display == DISPLAY_TOT ?
+		     "tot_hitm" :
 		     c2c.display == DISPLAY_RMT ?
 		     "rmt_hitm,lcl_hitm" :
 		     "lcl_hitm,rmt_hitm") < 0)
@@ -2520,7 +2544,7 @@ static int perf_c2c__report(int argc, const char **argv)
 			     "print_type,threshold[,print_limit],order,sort_key[,branch],value",
 			     callchain_help, &parse_callchain_opt,
 			     callchain_default_opt),
-	OPT_STRING('d', "display", &display, NULL, "lcl,rmt"),
+	OPT_STRING('d', "display", &display, "Switch HITM output type", "lcl,rmt"),
 	OPT_STRING('c', "coalesce", &coalesce, "coalesce fields",
 		   "coalesce fields: pid,tid,iaddr,dso"),
 	OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
@@ -2608,6 +2632,7 @@ static int perf_c2c__report(int argc, const char **argv)
 			"tot_loads,"
 			"ld_fbhit,ld_l1hit,ld_l2hit,"
 			"ld_lclhit,ld_rmthit",
+			c2c.display == DISPLAY_TOT ? "tot_hitm" :
 			c2c.display == DISPLAY_LCL ? "lcl_hitm" : "rmt_hitm"
 			);