linux-kernel - Re: [RFC PATCH 1/1] smp: Add tracepoints for functions called with smp_call

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Message-ID: <20230504093434.25f238b2@gandalf.local.home>
Date:   Thu, 4 May 2023 09:34:34 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Leonardo Brás <leobras@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yury Norov <yury.norov@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Nadav Amit <namit@...are.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>
Subject: Re: [RFC PATCH 1/1] smp: Add tracepoints for functions called with
 smp_call_function*()

On Thu, 04 May 2023 12:59:41 +0100
Valentin Schneider <vschneid@...hat.com> wrote:

> +TRACE_EVENT(csd_queue_cpu,
> +
> +	TP_PROTO(const unsigned int cpu,

Why the "const" ?

-- Steve

> +		 unsigned long callsite,
> +		 smp_call_func_t func,
> +		 call_single_data_t *csd),
> +
> +	TP_ARGS(cpu, callsite, func, csd),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(void *, callsite)
> +		__field(void *, func)
> +		__field(void *, csd)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->callsite = (void *)callsite;
> +		__entry->func = func;
> +		__entry->csd  = csd;
> +	),
> +
> +	TP_printk("cpu=%u callsite=%pS func=%pS csd=%p",
> +		  __entry->cpu, __entry->callsite, __entry->func, __entry->csd)
> +);
> +