From mboxrd@z Thu Jan 1 00:00:00 1970 From: xiakaixu Subject: Re: Does perf support different length of user-space hw_breakpoint? Date: Mon, 12 May 2014 17:00:30 +0800 Message-ID: <53708DAE.6080903@huawei.com> References: <53707DD6.2000108@huawei.com> <20140512080503.GL30445@twins.programming.kicks-ass.net> <20140512084823.GO30445@twins.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from szxga01-in.huawei.com ([119.145.14.64]:19899 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750907AbaELJAy (ORCPT ); Mon, 12 May 2014 05:00:54 -0400 In-Reply-To: <20140512084823.GO30445@twins.programming.kicks-ass.net> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Peter Zijlstra Cc: kaixu xia , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, paulus@samba.org, Ingo Molnar , Arnaldo Carvalho de Melo , Jiri Olsa , Borislav Petkov , Namhyung Kim , Huxinwei , peifeiyue@huawei.com, fweisbec@gmail.com =E4=BA=8E 2014/5/12 16:48, Peter Zijlstra =E5=86=99=E9=81=93: > On Mon, May 12, 2014 at 04:20:44PM +0800, kaixu xia wrote: >> 2014-05-12 16:05 GMT+08:00 Peter Zijlstra : >> >>> 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 tha= t? >=20 > I asked Frederic to answer your question :-) >=20 Thanks:-)