This is a note to let you know that I've just added the patch titled
rtla/timerlat_aa: Zero thread sum after every sample analysis
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rtla-timerlat_aa-zero-thread-sum-after-every-sample-.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5d7381c35db50b78101bcd6d65e7b517d11c11ca
Author: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Date: Fri Aug 4 17:52:11 2023 +0200
rtla/timerlat_aa: Zero thread sum after every sample analysis
[ Upstream commit 02d89917ef68acbe65c7cc2323f1db4429879878 ]
The thread thread_thread_sum accounts for thread interference
during a single activation. It was not being zeroed, so it was
accumulating thread interference over all activations.
It was not that visible when timerlat was the highest priority.
Link: https://lore.kernel.org/lkml/97bff55b0141f2d01b47d9450a5672fde147b89a.1691162043.git.bristot@xxxxxxxxxx
Fixes: 27e348b221f6 ("rtla/timerlat: Add auto-analysis core")
Signed-off-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/tracing/rtla/src/timerlat_aa.c b/tools/tracing/rtla/src/timerlat_aa.c
index e0ffe69c271c6..dec5b4c4511e1 100644
--- a/tools/tracing/rtla/src/timerlat_aa.c
+++ b/tools/tracing/rtla/src/timerlat_aa.c
@@ -159,6 +159,7 @@ static int timerlat_aa_irq_latency(struct timerlat_aa_data *taa_data,
taa_data->thread_nmi_sum = 0;
taa_data->thread_irq_sum = 0;
taa_data->thread_softirq_sum = 0;
+ taa_data->thread_thread_sum = 0;
taa_data->thread_blocking_duration = 0;
taa_data->timer_irq_start_time = 0;
taa_data->timer_irq_duration = 0;
