linux-kernel - Re: [PATCH 3/8] tracing: make trace_seq operations available for core kernel

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Message-ID: <alpine.DEB.2.00.0904142217300.31421@gandalf.stny.rr.com>
Date:	Tue, 14 Apr 2009 22:19:51 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>
Subject: Re: [PATCH 3/8] tracing: make trace_seq operations available for
 core kernel



On Tue, 14 Apr 2009, Peter Zijlstra wrote:

> On Tue, 2009-04-14 at 13:23 -0400, Steven Rostedt wrote:
> > +struct trace_seq {
> > +       unsigned char           buffer[PAGE_SIZE];
> > +       unsigned int            len;
> > +       unsigned int            readpos;
> > +};
> 
> Would not PAGE_SIZE-2*sizeof(int) be enough? That would make the struct
> fit into a single page and avoid an order-1 allocation.

That may be an option. I've even thought about doing that before. Not sure 
why I did not. But we could give it a try.

-- Steve

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