linux-kernel - Re: [PATCH] tracing: use ring_buffer_record_is_set_on() in tracer_tracing_is

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Date: Mon, 5 Feb 2024 07:55:04 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Sven Schnelle <svens@...ux.ibm.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Mete Durlu <meted@...ux.ibm.com>
Subject: Re: [PATCH] tracing: use ring_buffer_record_is_set_on() in
 tracer_tracing_is_on()

On Mon,  5 Feb 2024 07:53:40 +0100
Sven Schnelle <svens@...ux.ibm.com> wrote:

> tracer_tracing_is_on() checks whether record_disabled is not zero. This
> checks both the record_disabled counter and the RB_BUFFER_OFF flag.
> Reading the source it looks like this function should only check for
> the RB_BUFFER_OFF flag. Therefore use ring_buffer_record_is_set_on().
> This fixes spurious fails in the 'test for function traceon/off triggers'
> test from the ftrace testsuite when the system is under load.
> 

I've seen these spurious failures too, but haven't looked deeper into
it. Thanks,

-- Steve