linux-kernel - Re: [V4 PATCH ftrace/core] ftrace: Introduce saved_cmdlines

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Date:	Wed, 4 Jun 2014 12:23:50 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc:	linux-kernel@...r.kernel.org,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ingo Molnar <mingo@...hat.com>, yrl.pp-manager.tt@...achi.com
Subject: Re: [V4 PATCH ftrace/core] ftrace: Introduce saved_cmdlines_size
 file


Almost there ;-)

On Wed, 04 Jun 2014 16:18:48 +0900
Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com> wrote:


> +
> +static int allocate_cmdlines_buffer(unsigned int val,
> +				    struct saved_cmdlines_buffer *s)
> +{
> +	s->map_cmdline_to_pid = kmalloc(val * sizeof(unsigned), GFP_KERNEL);

s/sizeof(unsigned)/sizeof(*s->map_cmdline_to_pid)/

For the same reason as the memset.

Other than that, I think the rest looks good.

-- Steve

> +	if (!s->map_cmdline_to_pid)
> +		return -ENOMEM;
> +
> +	s->saved_cmdlines = kmalloc(val * TASK_COMM_LEN, GFP_KERNEL);
> +	if (!s->saved_cmdlines) {
> +		kfree(s->map_cmdline_to_pid);
> +		return -ENOMEM;
> +	}
> +
> +	s->cmdline_idx = 0;
> +	s->cmdline_num = val;
> +	memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP,
> +	       sizeof(s->map_pid_to_cmdline));
> +	memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP,
> +	       val * sizeof(*s->map_cmdline_to_pid));
> +
> +	return 0;
> +}
> +
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