linux-kernel - Re: [RFC PATCH 1/1] smi_detector: A System Management Interrupt detector

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Message-ID: <20090602075450.GA12411@elte.hu>
Date:	Tue, 2 Jun 2009 09:54:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jon Masters <jonathan@...masters.org>,
	linux-kernel@...r.kernel.org, jcm@...hat.com, tglx@...utronix.de,
	rostedt@...dmis.org
Subject: Re: [RFC PATCH 1/1] smi_detector: A System Management Interrupt
	detector


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Sun, 31 May 2009 12:31:18 -0400 Jon Masters <jonathan@...masters.org> wrote:
> 
> > This patch introduces a new SMI (System Management Interrupt) detector module
> > that can be used to detect high latencies within the system. It was originally
> > written for use in the RT kernel, but has wider applications.
> > 
> 
> Neat-looking code.
> 
> AFACIT it can be used on any platform.  Suppose that powerpcs or ia64s
> also mysteriously go to lunch like PC's do - I think the code will work
> for them too?  In which case the "smi" name is excessively specific. 
> Not a big deal though.

Yes, i wondered about that too - this is really a generic method 
that detects and measures hardware latencies.

Many of the internal smi_ prefixes can go - such a prefix is really 
only needed within a .c module if the symbol is exported.

The rest (and the whole facility) could be renamed to hwlat_, 
hw_latency_ or so - prominently documenting that on x86 it can find 
SMI latencies, etc.?

	Ingo
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