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: 1eeb6328e8
("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>
This commit is contained in:
parent
e9a4062e15
commit
01b05fc0e5
@ -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);
|
||||
|
Loading…
Reference in New Issue
Block a user