linux-kernel - Re: [PATCH V6 11/20] rtla/osnoise: Add the hist mode

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Message-ID: <20211027142918.487cd143@gandalf.local.home>
Date:   Wed, 27 Oct 2021 14:29:18 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tao Zhou <tao.zhou@...ux.dev>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.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 V6 11/20] rtla/osnoise: Add the hist mode

On Thu, 28 Oct 2021 02:11:24 +0800
Tao Zhou <tao.zhou@...ux.dev> wrote:

> > +	/* one histogram for IRQ and one for thread, per cpu */
> > +	for (cpu = 0; cpu < nr_cpus; cpu++) {
> > +		data->hist[cpu].samples = calloc(1, sizeof(*data->hist) * (entries + 1));  
> 
> @samples is a pointer to int and used for int array. The "sizeof(*data->hist)"
> should be "sizeof(int)" or am I totally wrong.

Or standard approach is: 

		data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1));

-- Steve