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Date: Mon, 12 May 2014 17:00:30 +0800
From: xiakaixu <xiakaixu@huawei.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: kaixu xia <xiakaixu1987@gmail.com>, <linux-kernel@vger.kernel.org>,
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        Namhyung Kim <namhyung@kernel.org>, Huxinwei <huxinwei@huawei.com>,
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Subject: Re: Does perf support different length of user-space hw_breakpoint?
References: <53707DD6.2000108@huawei.com> <20140512080503.GL30445@twins.programming.kicks-ass.net> <CAGjdHukwC3cu3YOSSteXsC4_52m-YTdAAYCfXV+q5A2pnW+CKQ@mail.gmail.com> <20140512084823.GO30445@twins.programming.kicks-ass.net>
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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@infradead.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:-)