linux-kernel - Re: [PATCH 0/9] oprofile: port to the new ring buffer

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Date:	Fri, 12 Dec 2008 06:57:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Robert Richter <robert.richter@....com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 0/9] oprofile: port to the new ring buffer


* Robert Richter <robert.richter@....com> wrote:

> This patch set ports cpu buffers in oprofile to the new ring buffer 
> provided by the tracing framework. The motivation here is to leave the 
> pain of implementing ring buffers to others. Oh, no, there are more 
> advantages. Main reason is the support of different sample sizes that 
> could be stored in the buffer. Use cases for this are IBS and Cell spu 
> profiling. Using the new ring buffer ensures valid and complete samples 
> and allows copying the cpu buffer stateless without knowing its 
> content. Second it will use generic kernel API and also reduce code 
> size. And hopefully, there are less bugs.
> 
> The patch set is also available here:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile.git ring_buffer

Pulled into tip/oprofile, thanks Robert - very nice stuff!

I've changed the exports to _GPL because these are really internal APIs 
with a high flux, so the practical requirement for code relying on it to 
be in-tree (or at least be source-available) is evident.

	Ingo
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