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rtla/osnoise: Better report when histogram is empty

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When osnoise hist does not observe any samples above the threshold,
no entries are recorded and the final report shows empty entries
for the usual statistics (count, min, max, avg):

    [~]# osnoise hist -d 5s -T 500
    # RTLA osnoise histogram
    # Time unit is microseconds (us)
    # Duration:   0 00:00:05
    Index
    over:
    count:
    min:
    avg:
    max:

That could lead users to confusing interpretations of the results.

A simple solution is to report 0 for count and the statistics, making it
clear that no noise (above the defined threshold) was observed:

    [~]# osnoise hist -d 5s -T 500
    # RTLA osnoise histogram
    # Time unit is microseconds (us)
    # Duration:   0 00:00:05
    Index
    over: 0
    count: 0
    min: 0
    avg: 0
    max: 0

Link: https://lkml.kernel.org/r/Zml6JmH5cbS7-HfZ@uudg.org

Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Reviewed-by: John Kacur <jkacur@redhat.com>
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
This commit is contained in:
Luis Claudio R. Goncalves 2024-06-12 07:36:22 -03:00 committed by Daniel Bristot de Oliveira
parent 59237b0c96
commit 587f05a88b
1 changed files with 15 additions and 0 deletions
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15
tools/tracing/rtla/src/osnoise_hist.c
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@ -374,6 +374,7 @@ osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *too
{
struct osnoise_hist_data *data = tool->data;
struct trace_instance *trace = &tool->trace;
int has_samples = 0;
int bucket, cpu;
int total;
@ -402,11 +403,25 @@ osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *too
continue;
}
/* There are samples above the threshold */
has_samples = 1;
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
}
/*
* If no samples were recorded, skip calculations, print zeroed statistics
* and return.
*/
if (!has_samples) {
trace_seq_reset(trace->seq);
trace_seq_printf(trace->seq, "over: 0\ncount: 0\nmin: 0\navg: 0\nmax: 0\n");
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
return;
}
if (!params->no_index)
trace_seq_printf(trace->seq, "over: ");