linux-kernel - Re: [PATCH v6] Unified trace buffer

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Message-Id: <1222455557.16700.285.camel@lappy.programming.kicks-ass.net>
Date:	Fri, 26 Sep 2008 20:59:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	David Wilder <dwilder@...ibm.com>, hch@....de,
	Martin Bligh <mbligh@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH v6] Unified trace buffer

On Fri, 2008-09-26 at 14:05 -0400, Steven Rostedt wrote:

> +struct buffer_page {
> +	u64		time_stamp;
> +	unsigned char	body[];
> +};
> +
> +#define BUF_PAGE_SIZE (PAGE_SIZE - sizeof(u64))

Since you're already using the page frame, you can stick this per page
timestamp in there as well, and get the full page for data.

You can either use a struct page overlay like slob does, or add a u64 in
the union that contains struct {private, mapping}.



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