linux-kernel - Re: [PATCH 5/7 v6] hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf events

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Date:	Thu, 12 Nov 2009 15:32:10 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jan Kiszka <jan.kiszka@....de>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	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>,
	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: [PATCH 5/7 v6] hw-breakpoints: Rewrite the hw-breakpoints
	layer on top of perf events

On Sun, Nov 08, 2009 at 06:24:46PM +0100, Jan Kiszka wrote:
> > +	 * care about the messed up debug address registers. But if
> > +	 * we have some of them active, restore the old state.
> > +	 */
> > +	if (__get_cpu_var(dr7) & DR_GLOBAL_ENABLE_MASK)
> 
> Looks good, just a minor remark: Would be cleaner to wrap this into an
> inline function, say hw_breakpoint_active(), to abstract the precise
> condition away from KVM.


Done :)

 
> > +		hw_breakpoint_restore();
> >  
> >  	set_bit(KVM_REQ_KICK, &vcpu->requests);
> >  	local_irq_enable();
> 
> Will see that I can give your series a try the next days, probably
> debugging qemu-kvm while running a guest that uses breakpoints. But I
> don't expect surprises.
> 
> Jan


Thanks!

You can find it at:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git
	tracing/hw-breakpoints



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