linux-kernel - Re: re-enable Nehalem raw Offcore-Events support

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Message-ID: <20110430081132.GA3705@liondog.tnic>
Date:	Sat, 30 Apr 2011 10:11:32 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Vince Weaver <vweaver1@...s.utk.edu>
Cc:	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <robert.richter@....com>
Subject: Re: re-enable Nehalem raw Offcore-Events support

On Fri, Apr 29, 2011 at 10:17:04PM -0400, Vince Weaver wrote:
> > AMD managed to keep a large chunk of their events stable even across very 
> > radical changes of the underlying hardware. I have two AMD systems produced 
> > *10* years apart and they even use the same event encodings for the major 
> > events.
> 
> Well guess what, AMD family 15h changes all of that.

I don't see a big problem here, Robert has a patch that takes care of
counter constraints. It probably needs a bit more work but we'll get
where we need to be.

> And you're not going to like LWP. They got tired of waiting for a
> workable kernel perf counter interface and moved it completely to
> usersapce,

I don't know where you get your information but that's absolutely and
completely not nearly even beginning to smell the truth.

> and there's nothing you can do about it unless you start blocking the
> xsave patches from getting in.

Look at tip/x86/xsave, looks like LWP support will most likely be in
2.6.40.

-- 
Regards/Gruss,
    Boris.
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