perf c2c: Add local variables for output metrics

This patch adds several local variables:

  "cl_output": pointer for outputting single cache line metrics;
  "output_str": pointer for outputting cache line metrics;
  "sort_str": pointer to the sorting metrics.

This can improve readability for the code and it's more flexible when
later extend to different strings for the output metrics.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210114154646.209024-7-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-c2c.c

@@ -2199,16 +2199,17 @@ static void print_pareto(FILE *out)
 	struct perf_hpp_list hpp_list;
 	struct rb_node *nd;
 	int ret;
+	const char *cl_output;
+
+	cl_output = "cl_num,"
+		    "cl_rmt_hitm,"
+		    "cl_lcl_hitm,"
+		    "cl_stores_l1hit,"
+		    "cl_stores_l1miss,"
+		    "dcacheline";
 
 	perf_hpp_list__init(&hpp_list);
-	ret = hpp_list__parse(&hpp_list,
-				"cl_num,"
-				"cl_rmt_hitm,"
-				"cl_lcl_hitm,"
-				"cl_stores_l1hit,"
-				"cl_stores_l1miss,"
-				"dcacheline",
-				NULL);
+	ret = hpp_list__parse(&hpp_list, cl_output, NULL);
 
 	if (WARN_ONCE(ret, "failed to setup sort entries\n"))
 		return;
@@ -2752,6 +2753,7 @@ static int perf_c2c__report(int argc, const char **argv)
 	OPT_END()
 	};
 	int err = 0;
+	const char *output_str, *sort_str = NULL;
 
 	argc = parse_options(argc, argv, options, report_c2c_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
@@ -2828,24 +2830,29 @@ static int perf_c2c__report(int argc, const char **argv)
 		goto out_mem2node;
 	}
 
-	c2c_hists__reinit(&c2c.hists,
-			"cl_idx,"
-			"dcacheline,"
-			"dcacheline_node,"
-			"dcacheline_count,"
-			"percent_hitm,"
-			"tot_hitm,lcl_hitm,rmt_hitm,"
-			"tot_recs,"
-			"tot_loads,"
-			"tot_stores,"
-			"stores_l1hit,stores_l1miss,"
-			"ld_fbhit,ld_l1hit,ld_l2hit,"
-			"ld_lclhit,lcl_hitm,"
-			"ld_rmthit,rmt_hitm,"
-			"dram_lcl,dram_rmt",
-			c2c.display == DISPLAY_TOT ? "tot_hitm" :
-			c2c.display == DISPLAY_LCL ? "lcl_hitm" : "rmt_hitm"
-			);
+	output_str = "cl_idx,"
+		     "dcacheline,"
+		     "dcacheline_node,"
+		     "dcacheline_count,"
+		     "percent_hitm,"
+		     "tot_hitm,lcl_hitm,rmt_hitm,"
+		     "tot_recs,"
+		     "tot_loads,"
+		     "tot_stores,"
+		     "stores_l1hit,stores_l1miss,"
+		     "ld_fbhit,ld_l1hit,ld_l2hit,"
+		     "ld_lclhit,lcl_hitm,"
+		     "ld_rmthit,rmt_hitm,"
+		     "dram_lcl,dram_rmt";
+
+	if (c2c.display == DISPLAY_TOT)
+		sort_str = "tot_hitm";
+	else if (c2c.display == DISPLAY_RMT)
+		sort_str = "rmt_hitm";
+	else if (c2c.display == DISPLAY_LCL)
+		sort_str = "lcl_hitm";
+
+	c2c_hists__reinit(&c2c.hists, output_str, sort_str);
 
 	ui_progress__init(&prog, c2c.hists.hists.nr_entries, "Sorting...");