linux-kernel - Re: [PATCH 1/2] tools, perf: Add a precise event qualifier v2

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Date:	Mon, 22 Jul 2013 23:01:08 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Vince Weaver <vince@...ter.net>
Cc:	Andi Kleen <andi@...stfloor.org>, acme@...radead.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/2] tools, perf: Add a precise event qualifier v2

On Tue, Jul 23, 2013 at 01:40:40AM -0400, Vince Weaver wrote:
> On Mon, 22 Jul 2013, Andi Kleen wrote:
> 
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > Add a precise qualifier, like cpu/event=0x3c,precise=1/
> 
> So you're adding this to "events/" but not to "format/"?

Fair point, but note that precise_ip is a bitfield. Since there is no
way to express that currently the parser would need to special case it anyways.

So it could be just added as precise_ip: precise_ip in events/,
but I have some doubts that really helps anyone.

Or invent some new syntax to abstract the bitfields, but that also
would need changes.

> This will break various existing programs.

Like what?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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