linux-kernel - Re: [PATCH 04/12] perf, x86: Support the TSX intx/intx

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Message-ID: <20130127131451.GE3933@gmail.com>
Date:	Sun, 27 Jan 2013 14:14:51 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	akpm@...ux-foundation.org, acme@...hat.com, eranian@...gle.com,
	jolsa@...hat.com, namhyung@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 04/12] perf, x86: Support the TSX intx/intx_cp qualifiers
 v2


* Andi Kleen <andi@...stfloor.org> wrote:

> On Sat, Jan 26, 2013 at 12:54:02PM +0100, Ingo Molnar wrote:
> > 
> > * Andi Kleen <andi@...stfloor.org> wrote:
> > 
> > > From: Andi Kleen <ak@...ux.intel.com>
> > > 
> > > Implement the TSX transaction and checkpointed transaction 
> > > qualifiers for Haswell. This allows e.g. to profile the number 
> > > of cycles in transactions.
> > 
> > The changelog should explain why this is a basic feature 
> > that is a must-have to have basic perf support. (i.e. 
> > default 'perf record', 'perf report', 'perf stat' and 'perf 
> > top' works and is meaningful.)
> 
> The patch is not needed for primitive cycle sampling only.

So please re-send a truly minimal hw-enabling series first, as 
requested - a minimal series that enables most of the everyday 
usecases.

> These qualifiers are a fundamental feature for any TSX tuning.

Any new, Haswell-specific profiling features should obviously be 
in a second (or third) series of patches.

Thanks,

	Ingo
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