linux-kernel - Re: [PATCH 1/7] Simple Performance Counters: Core Piece

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Message-ID: <y0m7iog6nyk.fsf@ton.toronto.redhat.com>
Date:	31 Jul 2007 21:30:27 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] Simple Performance Counters: Core Piece

Christoph Lameter <clameter@....com> writes:

> Simple performance counters are a way to measure the performance on
> code paths in the Linux kernel. Code must be instrumented with calls
> that signal the start and the stop of a measurement.  [...]

For what it's worth, this kind of measurement widget could be usefully
recast as a pure client of the lttng/systemtap markers that Mathieu is
still working on.  Instead of the custom pc_start/pc_stop functions,
you would have generic markers to identify the start/end spots, and a
bit of callback code to compute/export the statistics to procfs.

- FChE
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