From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E5D6ECDE32 for ; Wed, 17 Oct 2018 08:22:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1FD9121526 for ; Wed, 17 Oct 2018 08:22:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="l1nFkVuZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1FD9121526 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727257AbeJQQRD (ORCPT ); Wed, 17 Oct 2018 12:17:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:38818 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726947AbeJQQRD (ORCPT ); Wed, 17 Oct 2018 12:17:03 -0400 Received: from devbox (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9BD5821523; Wed, 17 Oct 2018 08:22:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1539764549; bh=D4rPEJNdvNEJukIZKApS1VRmdu3BG1LUlwfZWNrnK3w=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=l1nFkVuZ+24VUmqfuI/8lNrQoufXYRS4CNCxFjXNnXTls0gFdE5rzhv1gHmL+W6IQ voq/4SJrxiFinMif3jnyo88um/I6tUwZtpz9muX5D4kgKgk4C0jdbE8BmM5B66jQTM XEfYTfujKXNawaqvubrc/6ETz1wVAVvhqEebeB6w= Date: Wed, 17 Oct 2018 17:22:26 +0900 From: Masami Hiramatsu To: Arnaldo Carvalho de Melo Cc: David Miller , linux-kernel@vger.kernel.org, acme@kernel.org, Peter Zijlstra , Ingo Molnar , Jiri Olsa , Namhyung Kim , Masami Hiramatsu Subject: Re: perf's handling of unfindable user symbols... Message-Id: <20181017172226.7274498db2bbe3431c3f4057@kernel.org> In-Reply-To: <20181016184506.GB3254@redhat.com> References: <20181014.004238.292485794143606801.davem@davemloft.net> <20181015222546.GA2159@redhat.com> <20181015.160246.58484704665215987.davem@davemloft.net> <20181016184506.GB3254@redhat.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 16 Oct 2018 15:45:06 -0300 Arnaldo Carvalho de Melo wrote: > > So, I thought something had changed and in the past we would somehow > find that address in the kallsyms, but I couldn't find anything to back > that up, the patch introducing this is over a decade old, lots of things > changed, so I was just thinking I was missing something. > > I tried a gtod busy loop to generate vdso activity and added a 'perf > probe' at that branch, on x86_64 to see if it ever gets hit: > > Made thread__find_map() noinline, as 'perf probe' in lines of inline > functions seems to not be working, only at function start. (Masami?) Thank you for reporting it. Hmm, what happened when you did it? I checked some points, but seems no problem. (Would you see no line number? or defined event didn't work?) Thank you, -- Masami Hiramatsu