linux-kernel - Re: [PATCH 4/6] hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf events

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Message-ID: <20091105111151.GC4877@nowhere>
Date:	Thu, 5 Nov 2009 12:11:53 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Ingo Molnar <mingo@...e.hu>, 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>,
	Mike Galbraith <efault@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 4/6] hw-breakpoints: Rewrite the hw-breakpoints layer
	on top of perf events

On Thu, Nov 05, 2009 at 10:03:36PM +1100, Paul Mackerras wrote:
> Frederic Weisbecker writes:
> 
> > @@ -207,6 +212,15 @@ struct perf_event_attr {
> >  		__u32		wakeup_events;	  /* wakeup every n events */
> >  		__u32		wakeup_watermark; /* bytes before wakeup   */
> >  	};
> > +
> > +	union {
> > +		struct { /* Hardware breakpoint info */
> > +			__u64		bp_addr;
> > +			__u32		bp_type;
> > +			__u32		bp_len;
> > +		};
> > +	};
> 
> I'm wondering why you don't use attr.config for anything with
> breakpoint events?
> 
> Paul.


Because this is not sufficient to host the breakpoint parameters
given from userspace. May be I'm missing something?

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