Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933418AbbELNks (ORCPT ); Tue, 12 May 2015 09:40:48 -0400 Received: from mail.kernel.org ([198.145.29.136]:35303 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932663AbbELNkp (ORCPT ); Tue, 12 May 2015 09:40:45 -0400 Date: Tue, 12 May 2015 10:40:41 -0300 From: Arnaldo Carvalho de Melo To: Masami Hiramatsu Cc: "Naveen N. Rao" , linux-kernel@vger.kernel.org, srikar@linux.vnet.ibm.com Subject: Re: [PATCH] perf probe: Ignore tail calls to probed functions Message-ID: <20150512134041.GD29215@kernel.org> References: <20150430145834.GA5694@naverao1-tp.in.ibm.com> <5542BDC5.90609@hitachi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5542BDC5.90609@hitachi.com> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 954 Lines: 21 Em Fri, May 01, 2015 at 08:41:57AM +0900, Masami Hiramatsu escreveu: > On 2015/04/30 23:58, Naveen N. Rao wrote: > > The frame ends at 0xc0000000000bc27c. I suppose this is why this > > particular call is a "tail" call. FWIW, systemtap seems to ignore these > > as well and requires users to explicitly place probes at these call > > sites if necessary. I print out the caller so that users know. > > Ah, OK. That is out of the function frame, thus we can't put probe on it. > Hmm, we'd better wait for improvement of tail call support in dwarf... > Anyway, at this point, I'm OK for ignoring the probe point. > > Acked-by: Masami Hiramatsu Thanks, applied. - Arnaldo -- 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/