linux-kernel - Re: [GIT PULL v2] hw-breakpoints: Rewrite on top of perf events

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Date:	Sat, 24 Oct 2009 16:19:03 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Prasad <prasad@...ux.vnet.ibm.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>,
	Li Zefan <lizf@...fujitsu.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>
Subject: Re: [GIT PULL v2] hw-breakpoints: Rewrite on top of perf events

On Sat, Oct 24, 2009 at 04:16:52PM +0200, Frederic Weisbecker wrote:
> Hi all,
> 
> This is the v2 of the hw-breakpoints API rewrite on top of perf events.
> You can find the previous version here:
> http://lwn.net/Articles/351922/
> 
> Changes in v2:
>     
>     - Follow the perf "event " rename
>     - The ptrace regression have been fixed (ptrace breakpoint perf events
>       weren't released when a task ended)
>     - Drop the struct hw_breakpoint and store generic fields in
>       perf_event_attr.
>     - Separate core and arch specific headers, drop
>       asm-generic/hw_breakpoint.h and create linux/hw_breakpoint.h
>     - Use new generic len/type for breakpoint
>     - Handle off case: when breakpoints api is not supported by an arch
>     - Use proper in-kernel perf api provided by Arjan.
> 
> There are still a lot of things that need to be cleaned, simplified,
> improved (ptrace side, the bp api, etc....) I guess these things can
> be done incrementally if you agree.
> 
> I've also tried to get an arch-independent api. Generic fields for
> breakpoints are stored in perf_event_attr structure (type, len, addr).
> This needs to be discussed and improved before it becomes a perf
> userspace ABI. We need to find a generic enough structure to host
> the breakpoints parameters, something that can better fit to most arch
> (handling breakpoint ranges in powerpc, etc...).
> 
> Thanks.
> 
> ---
> 
> The following patchset are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
> 	perfevents/hw-breakpoint


BTW, this is a branch based on tip:tracing/hw_breakpoint with tip:perf/core
merged inside.

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