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

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Date:	Mon, 22 Dec 2008 15:53:39 -0800
From:	Carl Love <cel@...ibm.com>
To:	Robert Richter <robert.richter@....com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>
Subject: Re: [PATCH 0/9] oprofile: port to the new ring buffer

I have tested  the new ring buffer patches on an IBM Cell blade.  Our
OProfile testsuite ran fine on the the patched kernel. I ran the
testsuite three times yesterday/last night.  As far as I can tell
the new code works fine.

Note, I started with a 2.6.28-rc7 kernel from kernel.org.  I then
applied the the ftrace series of patches followed by the ring buffer
patches.  I then had to explicitly enable the tracing in the .config
file as there is now a dependency on that.  Robert updated the OProfile
dependency stuff yesterday.  I started with my .config file that I have
used for building kernels on my cell machine.

                       Carl Love

On Thu, 2008-12-11 at 17:41 +0100, Robert Richter 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
> 
> -Robert
> 
> 
> 
> 
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