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 5B0F6CD128A for ; Sun, 7 Apr 2024 07:50:30 +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-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:CC:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ag4ANpfuLqBQuRkguwkXvRR85cOn5LSRGzcGULz8lYM=; b=LmVMBvedyDCrI0 q3b5phhyex+KQaJmk0l1yvd8lMdVddA9vSgNuNqdR1QeUVdx4En83FnRF/3ZQ6J2TRVBiGtAf86EH +SKoEUGLiRc7G0WbGbmRysvPVETZLjU2O9XKIcrmRBr2Xix53ifo18NJ5GLUfOlGONuGalYgO4FPm RaI0P5IXCzgJ2FB17ZYsyBlS6CoCG+BAbzqskW8NlSBYOdbOS3kl/jeqiTJqM2AvSh9RyzOByak9R bogHA01fLRGdyTM/hqbuVQvF1DNSCVy11i40NKLvgYaXRktlu4/7rBvwCBmiu9U/fNqTIeTh9hydS 7sjBEeQ46g4e0mejGuaA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rtNI7-0000000C2V2-1Szs; Sun, 07 Apr 2024 07:50:15 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rtNI3-0000000C2Sg-1Or2; Sun, 07 Apr 2024 07:50:13 +0000 Received: from mail.maildlp.com (unknown [172.19.88.105]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4VC47C1yhVzwRPw; Sun, 7 Apr 2024 15:47:03 +0800 (CST) Received: from dggpemm100001.china.huawei.com (unknown [7.185.36.93]) by mail.maildlp.com (Postfix) with ESMTPS id 5A70414010C; Sun, 7 Apr 2024 15:49:55 +0800 (CST) Received: from [10.174.177.243] (10.174.177.243) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Sun, 7 Apr 2024 15:49:54 +0800 Message-ID: <4d45fffc-877a-4ad1-ad02-a33341e467e7@huawei.com> Date: Sun, 7 Apr 2024 15:49:53 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/7] arch/mm/fault: accelerate pagefault when badaccess Content-Language: en-US To: Andrew Morton CC: 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 , , , , , , , References: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> <20240403134539.fde3a6c594f2d88409be30ed@linux-foundation.org> From: Kefeng Wang In-Reply-To: <20240403134539.fde3a6c594f2d88409be30ed@linux-foundation.org> X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm100001.china.huawei.com (7.185.36.93) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240407_005011_896750_14BA352C X-CRM114-Status: UNSURE ( 8.91 ) X-CRM114-Notice: Please train this message. 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel