linux-kernel - Re: [ltt-dev] [PATCH] Simple LTTng userspace events through debugfs

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Date:	Thu, 18 Dec 2008 08:50:18 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...l.org>,
	ltt-dev@...ts.casi.polymtl.ca, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [ltt-dev] [PATCH] Simple LTTng userspace events through debugfs

On Wed, 17 Dec 2008 12:32:24 -0500 Mathieu Desnoyers wrote:

> Index: linux-2.6-lttng/ltt/ltt-userspace-event.c
> ===================================================================
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6-lttng/ltt/ltt-userspace-event.c	2008-12-17 12:03:43.000000000 -0500
> @@ -0,0 +1,129 @@
> +
> +/**
> + * write_event: write a userspace string into the trace stream

Hi Mathieu,

Please make above line:

 * write_event - write a userspace string into the trace system

Thanks.

> + * @file: file pointer
> + * @user_buf: user string
> + * @count: length to copy, including the final NULL
> + * @ppos: unused
> + *
> + * Copy a string into a trace event, in channel "userspace", event "event".
> + * Copies until either \n or \0 is reached.
> + * On success, returns the number of bytes copied from the source, including the
> + * \n or \0 character (if there was one in the count range). It cannot return
> + * more than count.
> + * Inspired from tracing_mark_write implementation from Steven Rostedt and
> + * Ingo Molnar.
> + */
> +static ssize_t write_event(struct file *file, const char __user *user_buf,
> +		size_t count, loff_t *ppos)
> +{


---
~Randy
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