Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755355AbbKRIML (ORCPT ); Wed, 18 Nov 2015 03:12:11 -0500 Received: from mx1.redhat.com ([209.132.183.28]:40426 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755166AbbKRIMK (ORCPT ); Wed, 18 Nov 2015 03:12:10 -0500 Date: Wed, 18 Nov 2015 09:12:05 +0100 From: Jiri Olsa To: "Wangnan (F)" Cc: Jiri Olsa , Arnaldo Carvalho de Melo , lkml , David Ahern , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Milian Wolff Subject: Re: [PATCH 2/3] perf tools: Add callchain order support for libunwind DWARF unwinder Message-ID: <20151118081205.GA9557@krava.brq.redhat.com> References: <1447772739-18471-1-git-send-email-jolsa@kernel.org> <1447772739-18471-3-git-send-email-jolsa@kernel.org> <564BFAD4.8060909@huawei.com> <20151118075431.GB5416@krava.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151118075431.GB5416@krava.brq.redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1779 Lines: 49 On Wed, Nov 18, 2015 at 08:54:31AM +0100, Jiri Olsa wrote: > On Wed, Nov 18, 2015 at 12:13:08PM +0800, Wangnan (F) wrote: > > SNIP > > > 3.38% a.out a.out [.] funcc > > | > > ---funcc > > | > > |--2.70%-- funcb > > | funca > > | main > > | __libc_start_main > > | _start > > | > > --0.68%-- 0 > > > > > > I'm not sure whether we can regard this behavior changing as a bugfix? I > > think > > there may be some reason the original code explicitly avoid creating an '0' > > entry. > > > > Then I tried to find why perf can't get call frame on my case, and > > I guess there's something wrong whe dealing with 'call' command, because > > the instruction on it I can't get callchain from libunwind is a 'callq': > > > > ... > > 4005bf: be 00 00 00 00 mov $0x0,%esi > > 4005c4: 48 89 c7 mov %rax,%rdi > > 4005c7: e8 74 fe ff ff callq 400440 > > us2 = tv2.tv_sec * 1000000 + tv2.tv_usec; > > 4005cc: 48 8b 04 24 mov (%rsp),%rax > > ... > > > > But this is another problem, we can discuss it in a new thread. > > so the problem is you dont see the gettimeofday call at the end? > > could you share the test code? just saw your other email on this issue.. let's continue there jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/