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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F821C43219 for ; Tue, 5 Apr 2022 20:28:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356123AbiDEU1S (ORCPT ); Tue, 5 Apr 2022 16:27:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1444471AbiDEPld (ORCPT ); Tue, 5 Apr 2022 11:41:33 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FC73C3347; Tue, 5 Apr 2022 07:04:58 -0700 (PDT) Received: from fraeml711-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4KXq9B2TTJz67nP6; Tue, 5 Apr 2022 22:02:54 +0800 (CST) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by fraeml711-chm.china.huawei.com (10.206.15.60) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 5 Apr 2022 16:04:55 +0200 Received: from [10.47.91.157] (10.47.91.157) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 5 Apr 2022 15:04:55 +0100 Message-ID: <5f1d8b3f-0afa-2724-4ff1-f061939c68c5@huawei.com> Date: Tue, 5 Apr 2022 15:04:51 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 To: From: John Garry Subject: perf tool: About "perf arm64: Inject missing frames when using 'perf record --call-graph=fp'" CC: , "jolsa@kernel.org >> Jiri Olsa" , , , "Linux Kernel Mailing List" , Arnaldo Carvalho de Melo Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.47.91.157] X-ClientProxiedBy: lhreml747-chm.china.huawei.com (10.201.108.197) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Alexandre, I notice that with commit b9f6fbb3b2c2 ("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'") that I get messages spewing the console when running perf record+report, as below: john@ubuntu:~/linux$sudo tools/perf/perf record -ag fio null12.fio john@ubuntu:~/linux$sudo tools/perf/perf report > report unwind: can't read reg 29 unwind: can't read reg 29 unwind: can't read reg 29 unwind: can't read reg 29 ... Do you know the possible cause? I haven't checked... Thanks, john