While the per-cpu values are the results to take into consideration, the
overall system values are also useful.
Add a summary at the bottom of rtla timerlat top showing the overall
results. For instance:
Timer Latency
0 00:00:10 | IRQ Timer Latency (us) | Thread
Timer Latency (us)
CPU COUNT | cur min avg max | cur min
avg max
0 #10003 | 113 19 150 441 | 134 35
170 459
1 #10003 | 63 8 99 462 | 84 15
119 481
2 #10003 | 3 2 89 396 | 21 8
108 414
3 #10002 | 206 11 210 394 | 223 21
228 415
---------------|----------------------------------------|---------------------------------------
ALL #40011 e0 | 2 137 462 | 8
156 481
Suggested-by: Juri Lelli <juri.le...@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bris...@kernel.org>
---
tools/tracing/rtla/src/timerlat_top.c | 108 ++++++++++++++++++++++++++
1 file changed, 108 insertions(+)
diff --git a/tools/tracing/rtla/src/timerlat_top.c
b/tools/tracing/rtla/src/timerlat_top.c
index c9cf90ed4e6d..bdcf8ef8f815 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -119,6 +119,37 @@ static struct timerlat_top_data *timerlat_alloc_top(int
nr_cpus)
return NULL;
}
+static void
+timerlat_top_reset_sum(struct timerlat_top_cpu *summary)
+{
+ memset(summary, 0, sizeof(*summary));
+ summary->min_irq = ~0;
+ summary->min_thread = ~0;
+ summary->min_user = ~0;
+}
+
+static void
+timerlat_top_update_sum(struct osnoise_tool *tool, int cpu, struct
timerlat_top_cpu *sum)
+{
+ struct timerlat_top_data *data = tool->data;
+ struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
+
+ sum->irq_count += cpu_data->irq_count;
+ update_min(&sum->min_irq, &cpu_data->min_irq);
+ update_sum(&sum->sum_irq, &cpu_data->sum_irq);
+ update_max(&sum->max_irq, &cpu_data->max_irq);
+
+ sum->thread_count += cpu_data->thread_count;
+ update_min(&sum->min_thread, &cpu_data->min_thread);
+ update_sum(&sum->sum_thread, &cpu_data->sum_thread);
+ update_max(&sum->max_thread, &cpu_data->max_thread);
+
+ sum->user_count += cpu_data->user_count;
+ update_min(&sum->min_user, &cpu_data->min_user);
+ update_sum(&sum->sum_user, &cpu_data->sum_user);
+ update_max(&sum->max_user, &cpu_data->max_user);
+}
+
/*
* timerlat_hist_update - record a new timerlat occurent on cpu, updating data
*/
@@ -285,6 +316,77 @@ static void timerlat_top_print(struct osnoise_tool *top,
int cpu)
}
}
+/*
+ * timerlat_top_print_sum - prints the summary output
+ */
+static void
+timerlat_top_print_sum(struct osnoise_tool *top, struct timerlat_top_cpu
*summary)
+{
+ const char *split = "----------------------------------------";
+ struct timerlat_top_params *params = top->params;
+ unsigned long long count = summary->irq_count;
+ int divisor = params->output_divisor;
+ struct trace_seq *s = top->trace.seq;
+ int e = 0;
+
+ if (divisor == 0)
+ return;
+
+ /*
+ * Skip if no data is available: is this cpu offline?
+ */
+ if (!summary->irq_count && !summary->thread_count)
+ return;
+
+ while (count > 999999) {
+ e++;
+ count /= 10;
+ }
+
+ trace_seq_printf(s, "%.*s|%.*s|%.*s", 15, split, 40, split, 39, split);
+ if (params->user_top)
+ trace_seq_printf(s, "-|%.*s", 39, split);
+ trace_seq_printf(s, "\n");
+
+ trace_seq_printf(s, "ALL #%-6llu e%d |", count, e);
+
+ if (!summary->irq_count) {
+ trace_seq_printf(s, " %s %s %s |", no_value, no_value,
no_value);
+ } else {
+ trace_seq_printf(s, " ");
+ trace_seq_printf(s, "%9llu ", summary->min_irq /
params->output_divisor);
+ trace_seq_printf(s, "%9llu ", (summary->sum_irq /
summary->irq_count) / divisor);
+ trace_seq_printf(s, "%9llu |", summary->max_irq / divisor);
+ }
+
+ if (!summary->thread_count) {
+ trace_seq_printf(s, "%s %s %s %s", no_value, no_value,
no_value, no_value);
+ } else {
+ trace_seq_printf(s, " ");
+ trace_seq_printf(s, "%9llu ", summary->min_thread / divisor);
+ trace_seq_printf(s, "%9llu ",
+ (summary->sum_thread / summary->thread_count) /
divisor);
+ trace_seq_printf(s, "%9llu", summary->max_thread / divisor);
+ }
+
+ if (!params->user_top) {
+ trace_seq_printf(s, "\n");
+ return;
+ }
+
+ trace_seq_printf(s, " |");
+
+ if (!summary->user_count) {
+ trace_seq_printf(s, " %s %s %s |", no_value, no_value,
no_value);
+ } else {
+ trace_seq_printf(s, " ");
+ trace_seq_printf(s, "%9llu ", summary->min_user / divisor);
+ trace_seq_printf(s, "%9llu ",
+ (summary->sum_user / summary->user_count) /
divisor);
+ trace_seq_printf(s, "%9llu\n", summary->max_user / divisor);
+ }
+}
+
/*
* clear_terminal - clears the output terminal
*/
@@ -301,6 +403,7 @@ static void
timerlat_print_stats(struct timerlat_top_params *params, struct osnoise_tool
*top)
{
struct trace_instance *trace = &top->trace;
+ struct timerlat_top_cpu summary;
static int nr_cpus = -1;
int i;
@@ -313,14 +416,19 @@ timerlat_print_stats(struct timerlat_top_params *params,
struct osnoise_tool *to
if (!params->quiet)
clear_terminal(trace->seq);
+ timerlat_top_reset_sum(&summary);
+
timerlat_top_header(params, top);
for (i = 0; i < nr_cpus; i++) {
if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
continue;
timerlat_top_print(top, i);
+ timerlat_top_update_sum(top, i, &summary);
}
+ timerlat_top_print_sum(top, &summary);
+
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
}
--
2.44.0
