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

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Message-ID: <20240207060923.182ecb55@rorschach.local.home>
Date: Wed, 7 Feb 2024 06:09:23 -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 Wed, 07 Feb 2024 06:50:59 +0100
Sven Schnelle <svens@...ux.ibm.com> wrote:

> Hi Steven,

> Not sure whether that is enough, have to test. However, it's not really
> a fix, it would just require a bit more load and the test would fail
> again. The fundamental problem is that even after disabling tracing
> there might be some tracing line added due to the lockless nature of
> the ringbuffer. This might then replace some existing cmdline entry.
> So maybe we should change the test to ignore the program name when
> calculating the checksums.

Have you figured out what caused the cmdlines to change when tracing is
off. It shouldn't be updated even with just 128 entries.

I'm also looking into a way to keep more of a LRU command lines around,
but nothing concrete yet.

-- Steve