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

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Message-ID: <53708DAE.6080903@huawei.com>
Date:	Mon, 12 May 2014 17:00:30 +0800
From:	xiakaixu <xiakaixu@...wei.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	kaixu xia <xiakaixu1987@...il.com>, <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?

于 2014/5/12 16:48, Peter Zijlstra 写道:
> On Mon, May 12, 2014 at 04:20:44PM +0800, kaixu xia wrote:
>> 2014-05-12 16:05 GMT+08:00 Peter Zijlstra <peterz@...radead.org>:
>>
>>> 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?
>>>
>>
>> Sorry, can not fully understand it. Can you give more details on that?
> 
> I asked Frederic to answer your question :-)
> 
Thanks:-)

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