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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B522DCD11C2 for ; Sun, 7 Apr 2024 17:20:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Ikcv0yCZFbMZOWQe03RMLJQ72BH8A9qnTjoqyUJYdBk=; b=N1XuddxipceVkA xQcQ5OewRLafSJslAZOar42bbq3OABWbJevdXp4vUiy3LlnDhxy0y1AZ0UXAxTAUejyKMVP6tIv6T VyxmQ0czQZRb7VDkHb8/tDGE6cz8f6naR6FMQF/w305Uli5MzDYt22wpfllI/e6mZLBHmLmHfFoKV MOHUBp35OlnkhdrVL0gAWxkS8QDjygezAjTPF+w/zBR0M9HRmrVBkT89m1Fr7v8EaQpt93gqNoqHK 4KZ163+5aAGaH2tmAdHGE4dtSm6UCc1jmurDMdU52z5uxSpG+fMTQE04C0NJRYJX694E7/X9oXGY0 PHrn6QTguCuXzWre34kA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rtWBf-0000000D8Ed-2HLb; Sun, 07 Apr 2024 17:20:11 +0000 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rtWBc-0000000D8Dx-2t0f; Sun, 07 Apr 2024 17:20:09 +0000 Received: from pps.filterd (m0353728.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 437GxAvB025509; Sun, 7 Apr 2024 17:19:12 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=F86vIyT96NLScE6Zk6mOrLIIbnCvATnEMB/X/BdWurM=; b=Vy+JfL7+GdlmHij4DY9+FF6bZBGKIzybu3H9TGxNhGMOiNojOX6vU1kcZiUile2ZWzzj xdBoUwoyOtYP6C2NH8E73yzr2geuDlQWgZsDTp5+Iatp3+IrlT56kZKLZgVECtOMYtPR LkTDs7Vdk/Yc3lJ1Mhn4FEZpQa9kh78F+6mul9elFYjbxv3mkUAXeNoCQwKRAvQioEsg vgXqRrAovajP2pMj78xg4rCIrdAvqZLlapXXlRbIUAU2z5zYjzt5z1bvp1jNwpY6p5vk Fclj73uOz2kJ1MmHrqV2Io+jRhoaAhECrFGmyWtX2RAlax5j2OLWRZiZvB7LbEkaYT1J Ag== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3xbyf4r11k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 07 Apr 2024 17:19:12 +0000 Received: from m0353728.ppops.net (m0353728.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 437HJBOd027129; Sun, 7 Apr 2024 17:19:11 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3xbyf4r11d-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 07 Apr 2024 17:19:11 +0000 Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 437EiDmP021485; Sun, 7 Apr 2024 17:19:10 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 3xbjxkb7y6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 07 Apr 2024 17:19:10 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 437HJ5ah37552504 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 7 Apr 2024 17:19:07 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F2FE620049; Sun, 7 Apr 2024 17:19:04 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C46CC20040; Sun, 7 Apr 2024 17:19:03 +0000 (GMT) Received: from osiris (unknown [9.179.2.159]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Sun, 7 Apr 2024 17:19:03 +0000 (GMT) Date: Sun, 7 Apr 2024 19:19:02 +0200 From: Heiko Carstens To: Kefeng Wang Cc: Andrew Morton , Russell King , Catalin Marinas , Will Deacon , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, surenb@google.com, linux-mm@kvack.org Subject: Re: [PATCH v2 0/7] arch/mm/fault: accelerate pagefault when badaccess Message-ID: <20240407171902.5958-A-hca@linux.ibm.com> References: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> <20240403134539.fde3a6c594f2d88409be30ed@linux-foundation.org> <4d45fffc-877a-4ad1-ad02-a33341e467e7@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4d45fffc-877a-4ad1-ad02-a33341e467e7@huawei.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Y3MmKFoPZYTA6URYFqSoHvL5OT_14Ypp X-Proofpoint-ORIG-GUID: Ts9vZ863gBFIi5c6rKKJKZ5ZbhTxcstc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-07_11,2024-04-05_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=950 bulkscore=0 lowpriorityscore=0 priorityscore=1501 mlxscore=0 spamscore=0 impostorscore=0 adultscore=0 clxscore=1011 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2404010000 definitions=main-2404070139 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240407_102008_746605_ACE19927 X-CRM114-Status: GOOD ( 22.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Apr 07, 2024 at 03:49:53PM +0800, Kefeng Wang wrote: > On 2024/4/4 4:45, Andrew Morton wrote: > > On Wed, 3 Apr 2024 16:37:58 +0800 Kefeng Wang wrote: > > > > > After VMA lock-based page fault handling enabled, if bad access met > > > under per-vma lock, it will fallback to mmap_lock-based handling, > > > so it leads to unnessary mmap lock and vma find again. A test from > > > lmbench shows 34% improve after this changes on arm64, > > > > > > lat_sig -P 1 prot lat_sig 0.29194 -> 0.19198 > > > > > > Only build test on other archs except arm64. > > > > Thanks. So we now want a bunch of architectures to runtime test this. Do > > we have a selftest in place which will adequately do this? > > I don't find such selftest, and badaccess would lead to coredump, the > performance should not affect most scene, so no selftest is acceptable. > lmbench is easy to use to measure the performance. The rationale for this series (performance improvement) is a bit odd, since I would expect that the changed code is usually never executed. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel