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Subject: Re: Benchmarks of kernel tracing options (ftrace and ktrace)
From: Steven Rostedt <rostedt@goodmis.org>
To: Michael Rubin <mrubin@google.com>
Cc: David Sharp <dhsharp@google.com>, linux-kernel@vger.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
        Frederic Weisbecker <fweisbec@gmail.com>
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Date: Thu, 18 Nov 2010 20:41:31 -0500
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On Thu, 2010-11-18 at 17:11 -0800, Michael Rubin wrote:

> > I did tell him that some ring buffer improvements did make it into the
> > kernel. You might want to try the latest mainline again.
> 
> You told me that you had patches (in 2.6.37) I think that would allow
> us to specifically improve the syscall tracing performance.
> 
> Can you point us at em?

Look at commits:

afcc5c6872f0215d515a637041bb51f8691a8ea7
69d1b839f7eee347e357b3f6cce7f630cc6ff93d
140ff89127c74b1b1c1b0152a36ea3720ccf6bc3
d9abde2138e0a00a0d7e44676928efa0ef629d48
b8b2663bd7c9da04ac804659b9f617c199d0252c

-- Steve