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Date: Mon, 12 May 2014 10:48:23 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: kaixu xia <xiakaixu1987@gmail.com>
Cc: xiakaixu <xiakaixu@huawei.com>, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org, paulus@samba.org,
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        Namhyung Kim <namhyung@kernel.org>, Huxinwei <huxinwei@huawei.com>,
        peifeiyue@huawei.com, fweisbec@gmail.com
Subject: Re: Does perf support different length of user-space hw_breakpoint?
Message-ID: <20140512084823.GO30445@twins.programming.kicks-ass.net>
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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>:
>=20
> > 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?
> >
>=20
> Sorry, can not fully understand it. Can you give more details on that?

I asked Frederic to answer your question :-)

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