linux-kernel - [PATCH 1/3] rtla/timerlat_aa: Zero thread sum after every sample analysis

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Message-Id: <97bff55b0141f2d01b47d9450a5672fde147b89a.1691162043.git.bristot@kernel.org>
Date:   Fri,  4 Aug 2023 17:52:11 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     William White <chwhite@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH 1/3] rtla/timerlat_aa: Zero thread sum after every sample analysis

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.

Fixes: 27e348b221f6 ("rtla/timerlat: Add auto-analysis core")
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
---
 tools/tracing/rtla/src/timerlat_aa.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/tracing/rtla/src/timerlat_aa.c b/tools/tracing/rtla/src/timerlat_aa.c
index e0ffe69c271c..dec5b4c4511e 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;
-- 
2.38.1