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

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Message-ID: <53720445.9090506@huawei.com>
Date:	Tue, 13 May 2014 19:38:45 +0800
From:	xiakaixu <xiakaixu@...wei.com>
To:	Peter Zijlstra <peterz@...radead.org>, <fweisbec@...il.com>
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>
Subject: Re: Does perf support different length of user-space hw_breakpoint?

ping....
于 2014/5/12 17:00, xiakaixu 写道:
> 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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