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authorJohn Kacur <jkacur@redhat.com>2024-05-10 15:03:18 -0400
committerDaniel Bristot de Oliveira <bristot@kernel.org>2024-05-16 16:45:40 +0200
commit01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608 (patch)
treea4ba261c43cddf94e1868d74b8a173d3ad96089f /tools
parente9a4062e1527238c5649d0f4be794a8566fd77c9 (diff)
rtla/timerlat: Fix histogram report when a cpu count is 0
On short runs it is possible to get no samples on a cpu, like this: # rtla timerlat hist -u -T50 Index IRQ-001 Thr-001 Usr-001 IRQ-002 Thr-002 Usr-002 2 1 0 0 0 0 0 33 0 1 0 0 0 0 36 0 0 1 0 0 0 49 0 0 0 1 0 0 52 0 0 0 0 1 0 over: 0 0 0 0 0 0 count: 1 1 1 1 1 0 min: 2 33 36 49 52 18446744073709551615 avg: 2 33 36 49 52 - max: 2 33 36 49 52 0 rtla timerlat hit stop tracing IRQ handler delay: (exit from idle) 48.21 us (91.09 %) IRQ latency: 49.11 us Timerlat IRQ duration: 2.17 us (4.09 %) Blocking thread: 1.01 us (1.90 %) swapper/2:0 1.01 us ------------------------------------------------------------------------ Thread latency: 52.93 us (100%) Max timerlat IRQ latency from idle: 49.11 us in cpu 2 Note, the value 18446744073709551615 is the same as ~0. Fix this by reporting no results for the min, avg and max if the count is 0. Link: https://lkml.kernel.org/r/20240510190318.44295-1-jkacur@redhat.com Cc: stable@vger.kernel.org Fixes: 1eeb6328e8b3 ("rtla/timerlat: Add timerlat hist mode") Suggested-by: Daniel Bristot de Oliveria <bristot@kernel.org> Signed-off-by: John Kacur <jkacur@redhat.com> Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/tracing/rtla/src/timerlat_hist.c60
1 files changed, 42 insertions, 18 deletions
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index d4bab86ca1b9..fbe2c6549bf9 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -327,17 +327,29 @@ timerlat_print_summary(struct timerlat_hist_params *params,
if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
continue;
- if (!params->no_irq)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].min_irq);
+ if (!params->no_irq) {
+ if (data->hist[cpu].irq_count)
+ trace_seq_printf(trace->seq, "%9llu ",
+ data->hist[cpu].min_irq);
+ else
+ trace_seq_printf(trace->seq, " - ");
+ }
- if (!params->no_thread)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].min_thread);
+ if (!params->no_thread) {
+ if (data->hist[cpu].thread_count)
+ trace_seq_printf(trace->seq, "%9llu ",
+ data->hist[cpu].min_thread);
+ else
+ trace_seq_printf(trace->seq, " - ");
+ }
- if (params->user_hist)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].min_user);
+ if (params->user_hist) {
+ if (data->hist[cpu].user_count)
+ trace_seq_printf(trace->seq, "%9llu ",
+ data->hist[cpu].min_user);
+ else
+ trace_seq_printf(trace->seq, " - ");
+ }
}
trace_seq_printf(trace->seq, "\n");
@@ -387,17 +399,29 @@ timerlat_print_summary(struct timerlat_hist_params *params,
if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
continue;
- if (!params->no_irq)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].max_irq);
+ if (!params->no_irq) {
+ if (data->hist[cpu].irq_count)
+ trace_seq_printf(trace->seq, "%9llu ",
+ data->hist[cpu].max_irq);
+ else
+ trace_seq_printf(trace->seq, " - ");
+ }
- if (!params->no_thread)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].max_thread);
+ if (!params->no_thread) {
+ if (data->hist[cpu].thread_count)
+ trace_seq_printf(trace->seq, "%9llu ",
+ data->hist[cpu].max_thread);
+ else
+ trace_seq_printf(trace->seq, " - ");
+ }
- if (params->user_hist)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].max_user);
+ if (params->user_hist) {
+ if (data->hist[cpu].user_count)
+ trace_seq_printf(trace->seq, "%9llu ",
+ data->hist[cpu].max_user);
+ else
+ trace_seq_printf(trace->seq, " - ");
+ }
}
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);