From patchwork Tue Apr 2 07:51:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 13613528 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 CE5CBCD1284 for ; Tue, 2 Apr 2024 07:53:42 +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:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=wJHB3xTyeYgSPxlUx8FVAwHzWuRBAcdsWU54sZRaALc=; b=zy4ovvcr3jqTCn gz4hn7N82m2NKgoQVzFY/tnS85fHUk7AaA7jYFgdDmIc1RCIbDL66yW0x0qmma0xhaspP19Dm7PJx PvWDNplU/zIs3Uh7gJSELMVYD7TBq1BA2DnmWlNprRSlSWgXpfGvUIH+ecR8oQZ77wee6hHs9L/OR XNj0zGE5uiqApykO7746nC9PKBsNYC565TM4ZqEmO15Jef6lx2SRkA4WZ6wjAmEKNJr92zXANIOaP hlJvygzVR37YDMSTA+Hteq5Kh3KcaGRDF3EdhqT2CIuSQoLfk3CfoEmGYRwFLvYz6JHGGN/OQgi1P ytFji1/Yj8/IJgR7B7/A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rrYxe-0000000A8Fe-1wvr; Tue, 02 Apr 2024 07:53:38 +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 1rrYxO-0000000A81j-1Atz; Tue, 02 Apr 2024 07:53:25 +0000 Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4V80RS5xc3zwRBB; Tue, 2 Apr 2024 15:50:28 +0800 (CST) Received: from dggpemm100001.china.huawei.com (unknown [7.185.36.93]) by mail.maildlp.com (Postfix) with ESMTPS id 7B67C140415; Tue, 2 Apr 2024 15:53:15 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) 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; Tue, 2 Apr 2024 15:53:14 +0800 From: Kefeng Wang To: 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 , , , , , , , Kefeng Wang Subject: [PATCH 0/7] arch/mm/fault: accelerate pagefault when badaccess Date: Tue, 2 Apr 2024 15:51:35 +0800 Message-ID: <20240402075142.196265-1-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] 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-20240402_005322_536947_D945F18B X-CRM114-Status: UNSURE ( 7.39 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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. Kefeng Wang (7): arm64: mm: cleanup __do_page_fault() arm64: mm: accelerate pagefault when VM_FAULT_BADACCESS arm: mm: accelerate pagefault when VM_FAULT_BADACCESS powerpc: mm: accelerate pagefault when badaccess riscv: mm: accelerate pagefault when badaccess s390: mm: accelerate pagefault when badaccess x86: mm: accelerate pagefault when badaccess arch/arm/mm/fault.c | 4 +++- arch/arm64/mm/fault.c | 31 ++++++++++--------------------- arch/powerpc/mm/fault.c | 33 ++++++++++++++++++++------------- arch/riscv/mm/fault.c | 5 ++++- arch/s390/mm/fault.c | 3 ++- arch/x86/mm/fault.c | 23 ++++++++++++++--------- 6 files changed, 53 insertions(+), 46 deletions(-)