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

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Message-ID: <20140512084823.GO30445@twins.programming.kicks-ass.net>
Date:	Mon, 12 May 2014 10:48:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	kaixu xia <xiakaixu1987@...il.com>
Cc:	xiakaixu <xiakaixu@...wei.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?

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 :-)

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