linux-kernel - Re: [PATCH V8 07/14] rtla/timerlat: Add timerlat hist mode

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Message-ID: <YangwS/M9hO+o7TH@geo.homenetwork>
Date:   Fri, 3 Dec 2021 17:17:53 +0800
From:   Tao Zhou <tao.zhou@...ux.dev>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        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
Subject: Re: [PATCH V8 07/14] rtla/timerlat: Add timerlat hist mode

On Mon, Nov 29, 2021 at 12:07:45PM +0100,
Daniel Bristot de Oliveira wrote:

> +static void timerlat_hist_usage(char *usage)
> +{
> +	int i;
> +
> +	char *msg[] = {
> +		"",
> +		"  usage: [rtla] timerlat hist [-h] [-q] [-p us] [-i us] [-t us] [-s us] [-T[=file]] \\",
> +		"         [-c cpu-list] [-P priority] [--no-irq] [--no-thread] [--no-header] [--no-summary] \\",
> +		"         [--no-index] [--with-zeros]",
> +		"",
> +		"	  -h/--help: print this menu",
> +		"	  -p/--period us: timerlat period in us",
> +		"	  -i/--irq us: stop trace if the irq latency is higher than the argument in us",
> +		"	  -T/--thread us: stop trace if the thread latency is higher than the argument in us",
> +		"	  -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
> +		"	  -c/--cpus cpus: run the tracer only on the given cpus",
> +		"	  -d/--duration time[m|h|d]: duration of the session in seconds",
> +		"	  -T/--trace[=file]: save the stopped trace to [file|timerlat_trace.txt]",
> +		"	  -n/--nano: display data in nanoseconds",
> +		"	  -b/--bucket-size N: set the histogram bucket size (default 1)",
> +		"	  -e/--entries N: set the number of entries of the histogram (default 256)",
> +		"	     --no-irq: ignore IRQ latencies",
> +		"	     --no-thread: ignore thread latencies",
> +		"	     --no-header: do not print header",
> +		"	     --no-summary: do not print summary",
> +		"	     --no-index: do not print index",
> +		"	     --with-zeros: print zero only entries",
> +		"	  -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
> +		"		o:prio - use SCHED_OTHER with prio",
> +		"		r:prio - use SCHED_RR with prio",
> +		"		f:prio - use SCHED_FIFO with prio",
> +		"		d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
> +		"						       in nanoseconds",
> +		NULL,
> +	};

[-t us] --> [-T us]
[-T[=file]] --> [-t[=file]]
[-d] [-b] [-e] [-n] lack in usage info. this is not important tho.