linux-kernel - Re: [PATCH 2/3] tracing: block-able ring

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Message-ID: <20090901231200.GD6108@nowhere>
Date:	Wed, 2 Sep 2009 01:12:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] tracing: block-able ring_buffer consumer

On Wed, Sep 02, 2009 at 01:05:10AM +0200, Frederic Weisbecker wrote:
> void poll_wait_pipe(struct trace_iterator *iter)
> {
> 	set_current_state(TASK_INTERRUPTIBLE);
> 	/* sleep for 100 msecs, and try again. */
> 	schedule_timeout(HZ / 10);
> }
> 
> On the worst case the reader will wait for 1/100 secs
> (the comment is wrong).


No the comment is not wrong. It's just that I really suck in math :-)


> 
> You can probably use the same thing for ring buffer splice
> and poll waiters.
> 
> 	Frederic.
> 

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