linux-kernel - [PATCH 3/3] tracing/timerlat: Do not wakeup the thread if the trace stops at the IRQ

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Message-Id: <b392356c91b56aedd2b289513cc56a84cf87e60d.1652175637.git.bristot@kernel.org>
Date:   Tue, 10 May 2022 11:45:25 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Clark Williams <williams@...hat.com>
Subject: [PATCH 3/3] tracing/timerlat: Do not wakeup the thread if the trace stops at the IRQ

There is no need to wakeup the timerlat/ thread if stop tracing is hit
at the timerlat's IRQ handler.

Return before waking up timerlat's thread.

Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
---
 kernel/trace/trace_osnoise.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 9b204ee3c6f5..035ec8b84e12 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1595,6 +1595,8 @@ static enum hrtimer_restart timerlat_irq(struct hrtimer *timer)
 
 			osnoise_stop_tracing();
 			notify_new_max_latency(diff);
+
+			return HRTIMER_NORESTART;
 		}
 	}
 
-- 
2.32.0