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

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Date:	Mon, 12 May 2014 15:52:54 +0800
From:	xiakaixu <xiakaixu@...wei.com>
To:	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:	<paulus@...ba.org>, Ingo Molnar <mingo@...nel.org>,
	<a.p.zijlstra@...llo.nl>,
	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: Does perf support different length of user-space hw_breakpoint?

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?

Thanks,

Xia Kaixu

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