linux-kernel - Re: [PATCH 2/3] perf tools: allow user to specify hardware breakpoint bp

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Message-ID: <517CB8AC.600@zytor.com>
Date:	Sat, 27 Apr 2013 22:50:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Jacob Shin <jacob.shin@....com>, Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH 2/3] perf tools: allow user to specify hardware breakpoint
 bp_len

On 04/27/2013 09:58 AM, Oleg Nesterov wrote:
> 
> Stupid question... So X86_FEATURE_BPEXT only works for r/w? I mean, it
> doesn't allow to specify the mask for an execute breakpoint?
> 

x86 execute breakpoints in general are only a single byte, which has to
be the first byte of the instruction.

	-hpa


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