linux-kernel - Re: [PATCH V8 04/14] rtla/osnoise: Add osnoise top mode

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Date:   Sat, 4 Dec 2021 19:04:11 +0100
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Tao Zhou <tao.zhou@...ux.dev>
Cc:     Ingo Molnar <mingo@...hat.com>, Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH V8 04/14] rtla/osnoise: Add osnoise top mode

Tao


On 11/29/21 12:07, Daniel Bristot de Oliveira wrote:
> +int osnoise_top_main(int argc, char **argv)
> +{
> +	struct osnoise_top_params *params;
> +	struct trace_instance *trace;
> +	struct osnoise_tool *record;
> +	struct osnoise_tool *tool;
> +	int return_value = 1;
> +	int retval;
> +
> +	params = osnoise_top_parse_args(argc, argv);
> +	if (!params)
> +		exit(1);
> +
> +	tool = osnoise_init_top(params);
> +	if (!tool) {
> +		err_msg("Could not init osnoise top\n");
> +		goto out_exit;
> +	}
> +
> +	retval = osnoise_top_apply_config(tool, params);
> +	if (retval) {
> +		err_msg("Could not apply config\n");
> +		goto out_top;
> +	}
> +
> +	trace = &tool->trace;
> +
> +	retval = enable_osnoise(trace);
> +	if (retval) {
> +		err_msg("Failed to enable osnoise tracer\n");
> +		goto out_top;
> +	}
> +
> +	if (params->set_sched) {
> +		retval = set_comm_sched_attr("osnoise/", &params->sched_param);
> +		if (retval) 


You hit this case. It is correct to get this error if one sets SCHED_DEADLINE
without disabling the admission control.

However, there is also a problem here. The tracer was not disabled, and the
instance was not removed - so osnoise threads kept running after the error
message and exit().

I will fix this on all tools for v9.

Thanks for testing!
--- Daniel

> +			osnoise_top_usage("Failed to set sched parameters\n");
> +	}
> +