linux-kernel - Re: Does perf support different length of user-space hw

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Message-ID: <20140512080503.GL30445@twins.programming.kicks-ass.net>
Date:	Mon, 12 May 2014 10:05:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	xiakaixu <xiakaixu@...wei.com>
Cc:	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	paulus@...ba.org, Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Huxinwei <huxinwei@...wei.com>, peifeiyue@...wei.com,
	fweisbec@...il.com
Subject: Re: Does perf support different length of user-space hw_breakpoint?

On Mon, May 12, 2014 at 03:52:54PM +0800, xiakaixu wrote:
> Hi guys,
> 
> Does perf support different length of user-space hw_breakpoint,
> such as  HW_BREAKPOINT_LEN_1/HW_BREAKPOINT_LEN_2/HW_BREAKPOINT_LEN_4/
> HW_BREAKPOINT_LEN_8?
> 
> Seems perf only support HW_BREAKPOINT_LEN_4/sizeof(long)
> by default from the source code and simple test.
> 
> May I have your opinions if I want to trace different bytes of
> hw_breakpoint addr?

Frederic?

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