linux-kernel - Re: [PATCH v1] rtla: Save trace when option `--trace` is specified

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Message-ID: <CAP4=nvTCVLa5MzBbJVz=S_ZiDoJ2hY-8fM+uRnGgumi0sFivWA@mail.gmail.com>
Date: Tue, 4 Mar 2025 09:16:11 +0100
From: Tomas Glozar <tglozar@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Costa Shulyupin <costa.shul@...hat.com>, John Kacur <jkacur@...hat.com>, 
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>, Eder Zulian <ezulian@...hat.com>, 
	Dan Carpenter <dan.carpenter@...aro.org>, linux-trace-kernel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] rtla: Save trace when option `--trace` is specified

út 4. 3. 2025 v 9:00 odesílatel Tomas Glozar <tglozar@...hat.com> napsal:
>
> So we need to stop tracing here, before we save the trace, if we want
> to do that. Perhaps combining this with the cleanup patch [1] and
> doing the stopping in save_trace_to_file would make sense?
>

Also, the patch will also save the trace if running with -a and the
threshold was not violated, which is not what one usually wants, e.g.:

$ rtla osnoise top -c 0 -q -a 10000000 -d 5s
                                         Operating System Noise

duration:   0 00:00:05 | time is in us
CPU Period       Runtime        Noise  % CPU Aval   Max Noise   Max
Single          HW          NMI          IRQ      Softirq       Threa
d
 0 #4           4000000        37712    99.05720       10998
555        7624            0         4011           34           2
4
 Saving trace to osnoise_trace.txt

I believe it would be better to add a new option, something like
--force-trace, that would be used to save the trace even if there is
no threshold violation. -t/--trace and -a could then be used with the
same semantics as before.

Tomas