linux-kernel - Re: [GIT PULL v6] hw-breakpoints: Rewrite on top of perf events v6

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Date:	Thu, 26 Nov 2009 10:01:10 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jan Kiszka <jan.kiszka@....de>,
	Jiri Slaby <jirislaby@...il.com>, Avi Kivity <avi@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [GIT PULL v6] hw-breakpoints: Rewrite on top of perf events v6


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> > Well we have PERF_TYPE_BREAKPOINT right now. I agree that it should 
> > be finalized in some sort of extensible ABI real soon - we dont want 
> > (and dont need to) add all features that might be possible in the 
> > future.
> 
> Concerning in-kernel users, it's not a worry. The in-kernel api is not 
> supposed to be stable and shouldn't, especially for such a very young 
> facility like generic breakpoints.

in-kernel we dont worry about indeed (we can change and iterate APIs 
freely there) - it is PERF_TYPE_BREAKPOINT that we need to make sure is 
extensible enough.

Thanks,

	Ingo
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