linux-kernel - Re: PATCH [0/4] perf: clean-up of power events API

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Message-ID: <1287488841.1994.5.camel@twins>
Date:	Tue, 19 Oct 2010 13:47:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Renninger <trenn@...e.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Pierre Tardy <tardyp@...il.com>,
	Jean Pihet <jean.pihet@...oldbits.com>,
	linux-trace-users@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, rjw@...k.pl,
	linux-omap@...r.kernel.org,
	Kevin Hilman <khilman@...prootsystems.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frank Eigler <fche@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: PATCH [0/4] perf: clean-up of power events API

On Tue, 2010-10-19 at 13:45 +0200, Ingo Molnar wrote:
> 
> * Thomas Renninger <trenn@...e.de> wrote:
> 
> > > Most definitely. It's no accident that it took such a long time for this issue 
> > > to be raised in the first place. It's a rare occurance -
> >
> > Do you agree that this occurance happened now and these events should get cleaned 
> > up before ARM and other archs make use of the broken interface?
> >
> > If not, discussing this further, is a big waste of time... and Jean would have to 
> > try to adapt his ARM code on the broken ABI...
> 
> The discussion seems to have died down somewhat. Please re-send to lkml the latest 
> patches you have to remind everyone of the latest state of things - the merge window 
> is getting near.
> 
> My only compatibility/ABI point is basically that it shouldnt break _existing_ 
> tracepoints (and users thereof). If your latest bits meet that then it ought to be a 
> good first step. You are free to (and encouraged to) introduce more complete sets of 
> events.

Can we deprecate and eventually remove the old ones, or will we be
forever obliged to carry the old ones too?
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