linux-kernel - Re: [PATCH 1/7] tracing: Introduce trace_create_cpu_file() and tracing_get

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Date:	Mon, 22 Jul 2013 13:34:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Alexander Z Lam <azl@...gle.com>,
	David Sharp <dhsharp@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] tracing: Introduce trace_create_cpu_file() and
 tracing_get_cpu()

On Mon, 2013-07-22 at 19:14 +0200, Oleg Nesterov wrote:
> On 07/22, Steven Rostedt wrote:
> >
> > Now here's why I'm emailing you.  What Oleg is doing here is instead of
> > creating this extra trace_cpu structure, he's using the inode->i_cdev to
> > store the CPU information (he's wrapped this with helper functions so we
> > can use any inode structure). He sets inode->i_cdev to CPU+1 or to
> > RING_BUFFER_ALL_CPUS (when all CPU info is needed).
> 
> This doesn't really matter, but RING_BUFFER_ALL_CPUS is encoded as NULL
> so we do not need to change init_tracer_debugfs(). inode_init_always()
> clears ->i_cdev.

Yeah, I noticed that after sending the email. We could just set
i_private to NULL and get the same effect.

-- Steve


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