[PATCH 1/6] perf timechart: always try to print at least 15 tasks

[Stanislav Fomichev]

Always try to print at least 15 tasks no matter how long they run.
Add -n option to specify desired number of tasks to print.

Signed-off-by: Stanislav Fomichev <stfomichev@xxxxxxxxxxxxxx>
---
 tools/perf/builtin-timechart.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index c2e02319347a..d965f26308ed 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -40,6 +40,8 @@
 #define SUPPORT_OLD_POWER_EVENTS 1
 #define PWR_EVENT_EXIT -1
 
+static int proc_num = 15;
+
 
 static unsigned int	numcpus;
 static u64		min_freq;	/* Lowest CPU frequency seen */
@@ -944,15 +946,17 @@ static void write_svg_file(const char *filename)
 {
 	u64 i;
 	int count;
+	int thresh = TIME_THRESH;
 
 	numcpus++;
 
 
-	count = determine_display_tasks(TIME_THRESH);
-
-	/* We'd like to show at least 15 tasks; be less picky if we have fewer */
-	if (count < 15)
-		count = determine_display_tasks(TIME_THRESH / 10);
+	/* We'd like to show at least proc_num tasks;
+	 * be less picky if we have fewer */
+	do {
+		count = determine_display_tasks(thresh);
+		thresh /= 10;
+	} while (thresh && count < proc_num);
 
 	open_svg(filename, numcpus, count, first_time, last_time);
 
@@ -963,9 +967,11 @@ static void write_svg_file(const char *filename)
 		svg_cpu_box(i, max_freq, turbo_frequency);
 
 	draw_cpu_usage();
-	draw_process_bars();
+	if (proc_num)
+		draw_process_bars();
 	draw_c_p_states();
-	draw_wakeups();
+	if (proc_num)
+		draw_wakeups();
 
 	svg_close();
 }
@@ -1094,6 +1100,8 @@ int cmd_timechart(int argc, const char **argv,
 		       parse_process),
 	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 		    "Look for files with symbols relative to this directory"),
+	OPT_INTEGER('n', "number", &proc_num,
+		    "min. number of tasks to print"),
 	OPT_END()
 	};
 	const char * const timechart_usage[] = {
-- 
1.8.1.2

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