linux-kernel - Re: [PATCH] arch_check_bp_in_kernelspace: fix the range check

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Message-ID: <1353426955.6276.24.camel@gandalf.local.home>
Date:	Tue, 20 Nov 2012 10:55:55 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Amnon Shiloh <u3557@...o.sublimeip.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch_check_bp_in_kernelspace: fix the range check

On Tue, 2012-11-20 at 16:48 +0100, Oleg Nesterov wrote:

> > But here, there's no prejudice between tasks. All tasks will now hit the
> > breakpoint regardless of if it is being traced or not.
>   ^^^^^^^^^^
> 
> This is hardware breakpoint, it is per-task.

I forgot that hw breakpoints are swapped out at context switch (as Amnon
informed me). 

OK, that makes a big difference.

Thanks,

-- Steve


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