linux-kernel - Re: [PATCH] ring_buffer: compressed event header

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Message-ID: <alpine.DEB.2.00.0904232356400.24293@gandalf.stny.rr.com>
Date:	Fri, 24 Apr 2009 00:27:01 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ring_buffer: compressed event header


On Fri, 24 Apr 2009, Lai Jiangshan wrote:

> 
> 
> RB_MAX_SMALL_DATA = 28bytes is too small for most tracers, it wastes
> an 'u32' to save the actually length for events which data size > 28.
> 
> This fix uses compressed event header and enlarges RB_MAX_SMALL_DATA.
> 
> Impact: saves about 0%-12.5%(depends on tracer) memory in ring_buffer
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>

Thanks, applied!

-- Steve

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