diff options
| author |  John Kacur <jkacur@redhat.com>
| 2024-05-10 15:03:18 -0400 |
|---|---|---|
| committer |  Daniel Bristot de Oliveira <bristot@kernel.org>
| 2024-05-16 16:45:40 +0200 |
| commit | 01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608 (patch) | |
| tree | a4ba261c43cddf94e1868d74b8a173d3ad96089f /tools/tracing | |
| parent | rtla: Add --trace-buffer-size option (diff) | |
| download | linux-01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608.tar.gz linux-01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608.tar.bz2 linux-01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608.zip | |
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/tracing')
| -rw-r--r-- | tools/tracing/rtla/src/timerlat_hist.c | 60 |
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); |