linux-kernel - Re: [PATCH 1/3] ring-buffer: make the buffer a true circular link list

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Message-ID: <alpine.DEB.2.00.0906102200180.30552@gandalf.stny.rr.com>
Date:	Wed, 10 Jun 2009 22:00:49 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Christoph Hellwig <hch@...radead.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Huang Ying <ying.huang@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/3] ring-buffer: make the buffer a true circular link
 list


On Thu, 11 Jun 2009, Lai Jiangshan wrote:

> > -	list_splice(&pages, head);
> > +	/*
> > +	 * The ring buffer page list is a circular list that does not
> > +	 * start and end with a list head. All page list items point to
> > +	 * other pages. Remove one of the pages, init its list head,
> > +	 * and use list splice to move the rest of the pages to it.
> > +	 */
> > +	bpage = list_entry(pages.next, struct buffer_page, list);
> > +	list_del_init(&bpage->list);
> > +	cpu_buffer->pages = &bpage->list;
> > +
> > +	list_splice(&pages, cpu_buffer->pages);
> > +
> 
> Is it proper?
> 
> 	cpu_buffer->pages = pages.next;
> 	list_del(&pages);
> 

Not sure what you are asking here?

-- Steve

> >  
> >  	rb_check_pages(cpu_buffer);
> >  
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