From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D59317983 for ; Fri, 27 Oct 2023 10:10:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="on/HTgOA" Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 674AD10E; Fri, 27 Oct 2023 03:10:45 -0700 (PDT) Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39R9WQej010442; Fri, 27 Oct 2023 10:10:38 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=pp1; bh=Zdppxo1TCnt1+1WH+y7YV+bUn+8htX5Iub4/UTKYWm4=; b=on/HTgOAdS4zFn4b5OKS/+QUk1oy24KdZ2S14TDqgLY9BJ4ZJhyMjs8SfZatQ2Y/RP+/ mqfYPD7FYi3/iPUAaOiftyawZissO6JZ4989afKf9xGHSP5ic1raa21xQDhniLv/V7JE zcEdkOlSuUW/EVLNVpDDUMjMh6+SSExtcPv7b3Y3BrEzD79mkWxglRGVopd6BSH0Z1We dPGfvEjSS5yg4rjCgAy/uaSB30rI82HAkXNA3KtSAu8rjkLmRVq6nWsSnPtAK2GGSw4G PVgUjs5uA/I1vKzc+G3s07RBvOxnHRgZ/IPkNSQQ8t31nvC+9mt8Je+OBvIQEoC9yW23 LQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3u0anp96hc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Oct 2023 10:10:35 +0000 Received: from m0353729.ppops.net (m0353729.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 39R9o9Bn004880; Fri, 27 Oct 2023 10:10:05 GMT Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3u0anp94yk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Oct 2023 10:10:05 +0000 Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 39R7h9Jc011857; Fri, 27 Oct 2023 10:09:30 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3tywqr486r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Oct 2023 10:09:30 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 39RA9RlR44630662 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 27 Oct 2023 10:09:27 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 719DA20067; Fri, 27 Oct 2023 10:09:27 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C476920049; Fri, 27 Oct 2023 10:09:26 +0000 (GMT) Received: from osiris (unknown [9.171.25.10]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Fri, 27 Oct 2023 10:09:26 +0000 (GMT) Date: Fri, 27 Oct 2023 12:09:25 +0200 From: Heiko Carstens To: Daan De Meyer Cc: linux-s390@vger.kernel.org, linux-perf-users@vger.kernel.org, "dcavalca@meta.com" , ngompa@fedoraproject.org, Andreas Krebbel , Ilya Leoshkevich , Thomas Richter , Sumanth Korikkar , Vasily Gorbik Subject: Re: s390x stack unwinding with perf? Message-ID: <20231027100925.9071-B-hca@linux.ibm.com> References: <20231026145659.7063-A-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: zRSqztLHIpZI_t0IceHuvxdPJ0xSOB8V X-Proofpoint-ORIG-GUID: X8YHzSy_NMYz8F7GQ5W8H0P2EvPIFxOA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-27_08,2023-10-26_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 phishscore=0 bulkscore=0 malwarescore=0 mlxlogscore=529 clxscore=1015 priorityscore=1501 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2310240000 definitions=main-2310270087 On Fri, Oct 27, 2023 at 10:00:53AM +0200, Daan De Meyer wrote: > > If the kernel gets support for s390x user space unwinding using the backchain, > we'll propose to enable -mbackchain in the default compilation flags for Fedora > so that s390x on Fedora will have the same profiling experience as x86-64, arm64 > and ppc64. For now we'll keep the status quo since compiling with the backchain > doesn't provide any benefit until the kernel unwinder can unwind user > space stacks > using it. > > Thanks for clarifying the current state of user space stack unwinding on s390x! We will implement the missing pieces and let you know when things are supposed to work.