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Date: Tue, 13 May 2014 19:38:45 +0800
From: xiakaixu <xiakaixu@huawei.com>
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To: Peter Zijlstra <peterz@infradead.org>, <fweisbec@gmail.com>
CC: kaixu xia <xiakaixu1987@gmail.com>, <linux-kernel@vger.kernel.org>,
        <linux-perf-users@vger.kernel.org>, <paulus@samba.org>,
        Ingo Molnar <mingo@kernel.org>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Namhyung Kim <namhyung@kernel.org>, Huxinwei <huxinwei@huawei.com>,
        <peifeiyue@huawei.com>
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> <53708DAE.6080903@huawei.com>
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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@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:-)
> 
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