From: Andreas Ziegler <br015@umbiko.net>
To: Daniel Bristot de Oliveira <bristot@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Cc: linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org,
Andreas Ziegler <br015@umbiko.net>
Subject: [PATCH 1/2 v2] tools/tracing/rtla: osnoise_hist: use total duration for average calculation
Date: Tue, 3 Jan 2023 11:33:59 +0100 [thread overview]
Message-ID: <20230103103400.275566-2-br015@umbiko.net> (raw)
In-Reply-To: <f47e877c-c95f-e3e6-b96f-89b0ca582878@kernel.org>
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).
Fixes: 829a6c0b5698 ("rtla/osnoise: Add the hist mode")
Signed-off-by: Andreas Ziegler <br015@umbiko.net>
---
Changes v1 -> v2:
- add 'Fixes' line (Daniel)
tools/tracing/rtla/src/osnoise_hist.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
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)
--
2.34.1
next prev parent reply other threads:[~2023-01-03 10:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-24 12:39 rtla osnoise hist: average duration is always zero Andreas Ziegler
2022-12-24 21:17 ` Slade Watkins
2022-12-26 11:50 ` Andreas Ziegler
2022-12-28 15:25 ` Daniel Bristot de Oliveira
2023-01-03 10:33 ` [PATCH 0/2 v2] rtla osnoise hist average calculation Andreas Ziegler
2023-01-03 10:33 ` Andreas Ziegler [this message]
2023-01-12 14:32 ` [PATCH 1/2 v2] tools/tracing/rtla: osnoise_hist: use total duration for " Daniel Bristot de Oliveira
2023-01-03 10:34 ` [PATCH 2/2 v2] tools/tracing/rtla: osnoise_hist: display average with two-digit precision Andreas Ziegler
2023-01-12 14:33 ` Daniel Bristot de Oliveira
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