linux-kernel - Re: [RFC 0/3] Basic support for LWP

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Message-ID: <alpine.LFD.2.00.1010042358520.2556@localhost6.localdomain6>
Date:	Tue, 5 Oct 2010 00:13:46 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Hans Rosenfeld <hans.rosenfeld@....com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC 0/3] Basic support for LWP

On Mon, 4 Oct 2010, Hans Rosenfeld wrote:

> LWP (Light-Weight Profiling) is a new profiling mechanism that allows
> user mode processes to gather performance data about themselves with
> very low overhead. The specification can be found here:
>         http://developer.amd.com/cpu/LWP/Pages/default.aspx

All I can see there is marketing blurb. The spec pdf does not tell me
either how the end result of your patches will look like.

> This code adds basic support for LWP to the context switch code, which
> is the minimum needed to use LWP. Support for other LWP features like
> interrupts will be added later.

Oh no. We are not going to merge that and give you a card blanche to
come up with another profiling/performance monitoring facility which
is completely disconnected to everything else.

Please provide either the full patch of this facility or at least a
reasonable explanation how it will look like when your code is
ready. What's the user space interface, how does it hook into perf,
etc ...

Thanks,

	tglx
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