From mboxrd@z Thu Jan 1 00:00:00 1970 From: minchan@kernel.org (Minchan Kim) Date: Thu, 6 Sep 2018 19:22:09 +0900 Subject: [RFC 0/3] arm: support get_user_pages_fast Message-ID: <20180906102212.218294-1-minchan@kernel.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Recently, I got a report get_user_pages_fast helps app's launching time due to reducing uninterruptible sleep time because it could reduce mmap_sem lock contentions when app is launching. To support gupf in ARM-non-LPAE, first patch reorders memory type table to use 5th bit of the page table. It seems we don't use the bit in ARMv6+ but it needs double check from maintainers. Second patch introduces L_PTE_SPECIAL for arm so that last patch can support get_user_pags_fast. I would greatly appreciate if guys review that I screw up something, especially, architecture stuffs. Thanks. Minchan Kim (3): arm: mm: reordering memory type table arm: mm: introduce L_PTE_SPECIAL arm: mm: support get_user_pages_fast arch/arm/Kconfig | 2 +- arch/arm/include/asm/pgtable-2level.h | 16 +- arch/arm/include/asm/pgtable-3level.h | 6 - arch/arm/include/asm/pgtable.h | 13 ++ arch/arm/mm/Makefile | 6 + arch/arm/mm/gup.c | 221 ++++++++++++++++++++++++++ arch/arm/mm/proc-macros.S | 16 +- 7 files changed, 261 insertions(+), 19 deletions(-) create mode 100644 arch/arm/mm/gup.c -- 2.19.0.rc1.350.ge57e33dbd1-goog 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 X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=DKIM_SIGNED, MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3CA2C433F5 for ; Thu, 6 Sep 2018 10:22:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9E27020857 for ; Thu, 6 Sep 2018 10:22:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZaMmXxyF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9E27020857 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728641AbeIFO5P (ORCPT ); Thu, 6 Sep 2018 10:57:15 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:42086 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726444AbeIFO5P (ORCPT ); Thu, 6 Sep 2018 10:57:15 -0400 Received: by mail-pf1-f196.google.com with SMTP id l9-v6so5054421pff.9 for ; Thu, 06 Sep 2018 03:22:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=oUV3jnVtIfcmlpjpbZ7tv+73twNtVA8egCP+4hxOgSQ=; b=ZaMmXxyF8ITJN+h/1LiB3qwm7g69o/xFjx9rRzlANmjeJ66jhHwNJq2ZWoIuUEKxBK PpmjYAwWTaYckSzF5Pv8IWvPlgeTSGw4b1uV51swJ6uoZIrRVHDIQKc2e5mM3BZT7szF G2/ooObiiIxJ85bBy+04DRz/l7qjMjU9Zpo8ZEI9AR6uRUPqxKQ671sSEgsyQ97Y6wLK 66J9gwK/6EZnT4TFFL1xCUeovwRmAxu9kZ4zsTbocFCVhEwgP2UrNy960XsYHbF5rOQm 3/bxqGREvzymCULSXf1v0ZAoZbc5k0owGq4CsU7izRE0NpYZ84g5U00/8zJnpYD8LUXr vYig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; bh=oUV3jnVtIfcmlpjpbZ7tv+73twNtVA8egCP+4hxOgSQ=; b=D+KJVkq4HAEWh0avgEGisd2xv5KkDIi0/N+OGoRz3WLByxKpNIV3jNuLeG0LhdICcU x76z1C62U+rQved2HjfbLvlYfjRO2hIVvpvXkeJaGOrOZBClkzORwMq/4eR0YtLrkaTV JoqrfuUuDwKa5sfd5B5ZnIkhBNI2csoGZD3EMP1X9pa7+4HyUnj+r5EfaotajpvztMc+ aw3js/GsCmGNwAtvIvIZdgi/n/vG80TUt+er23Prv/T3OPK0Tmf/wfFriMsdDtQTU4b+ hjI5IcCnOsTLgUm9VlJv8tbi0rhF1NnSvHU8wp0W3DfHAq918fRB34RiQHSDenHGoB0n 9OcQ== X-Gm-Message-State: APzg51CL/1waF6dsd5JRy5nFGx8OjM9qI/EzhxB7yfn7mpsov97QvX8W ZMJCOL9jjHUGBjaHnpTwhso= X-Google-Smtp-Source: ANB0VdamdUG0YGTN2sft+92C4x3kBY7vCWEhwpLLYSvCQK6hBoxWzKAv8vExC5qAYgW2iTPqUF93zQ== X-Received: by 2002:a63:706:: with SMTP id 6-v6mr1948594pgh.137.1536229348392; Thu, 06 Sep 2018 03:22:28 -0700 (PDT) Received: from bbox-2.seo.corp.google.com ([2401:fa00:d:10:affa:813f:5380:6613]) by smtp.gmail.com with ESMTPSA id h82-v6sm7909555pfa.173.2018.09.06.03.22.23 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 06 Sep 2018 03:22:26 -0700 (PDT) From: Minchan Kim To: Andrew Morton , linux@armlinux.org.uk Cc: steve.capper@linaro.org, will.deacon@arm.com, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel-team@android.com, android-treble-mediatek-ext@partner.android.com, Minchan Kim Subject: [RFC 0/3] arm: support get_user_pages_fast Date: Thu, 6 Sep 2018 19:22:09 +0900 Message-Id: <20180906102212.218294-1-minchan@kernel.org> X-Mailer: git-send-email 2.19.0.rc1.350.ge57e33dbd1-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Recently, I got a report get_user_pages_fast helps app's launching time due to reducing uninterruptible sleep time because it could reduce mmap_sem lock contentions when app is launching. To support gupf in ARM-non-LPAE, first patch reorders memory type table to use 5th bit of the page table. It seems we don't use the bit in ARMv6+ but it needs double check from maintainers. Second patch introduces L_PTE_SPECIAL for arm so that last patch can support get_user_pags_fast. I would greatly appreciate if guys review that I screw up something, especially, architecture stuffs. Thanks. Minchan Kim (3): arm: mm: reordering memory type table arm: mm: introduce L_PTE_SPECIAL arm: mm: support get_user_pages_fast arch/arm/Kconfig | 2 +- arch/arm/include/asm/pgtable-2level.h | 16 +- arch/arm/include/asm/pgtable-3level.h | 6 - arch/arm/include/asm/pgtable.h | 13 ++ arch/arm/mm/Makefile | 6 + arch/arm/mm/gup.c | 221 ++++++++++++++++++++++++++ arch/arm/mm/proc-macros.S | 16 +- 7 files changed, 261 insertions(+), 19 deletions(-) create mode 100644 arch/arm/mm/gup.c -- 2.19.0.rc1.350.ge57e33dbd1-goog