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| author | Andreas Ziegler <br015@umbiko.net> | 2023-01-03 13:33:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 11:33:26 +0300 |
| commit | f86d50bf196998e04c3a9e6928cccdd38eb3e726 (patch) | |
| tree | dc894925d6b8c4ae247be10eb22bbe43717603f9 | |
| parent | 0cd7777c7476c8e18f89a361cc2f980f350d5701 (diff) | |
| download | linux-f86d50bf196998e04c3a9e6928cccdd38eb3e726.tar.xz | |
tools/tracing/rtla: osnoise_hist: use total duration for average calculation
[ Upstream commit fe137a4fe0e77eb95396cfc5c3dd7df404421aa4 ]
Sampled durations must be weighted by observed quantity, to arrive at a correct
average duration value.
Perform calculation of total duration by summing (duration * count).
Link: https://lkml.kernel.org/r/20230103103400.275566-2-br015@umbiko.net
Fixes: 829a6c0b5698 ("rtla/osnoise: Add the hist mode")
Signed-off-by: Andreas Ziegler <br015@umbiko.net>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | tools/tracing/rtla/src/osnoise_hist.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c index 5d7ea479ac89..fe34452fc4ec 100644 --- a/tools/tracing/rtla/src/osnoise_hist.c +++ b/tools/tracing/rtla/src/osnoise_hist.c @@ -121,6 +121,7 @@ static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu, { struct osnoise_hist_params *params = tool->params; struct osnoise_hist_data *data = tool->data; + unsigned long long total_duration; int entries = data->entries; int bucket; int *hist; @@ -131,10 +132,12 @@ static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu, if (data->bucket_size) bucket = duration / data->bucket_size; + total_duration = duration * count; + hist = data->hist[cpu].samples; data->hist[cpu].count += count; update_min(&data->hist[cpu].min_sample, &duration); - update_sum(&data->hist[cpu].sum_sample, &duration); + update_sum(&data->hist[cpu].sum_sample, &total_duration); update_max(&data->hist[cpu].max_sample, &duration); if (bucket < entries) |