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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,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 BBE23C433E0 for ; Thu, 21 Jan 2021 16:53:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73D2223A57 for ; Thu, 21 Jan 2021 16:53:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388230AbhAUQxN (ORCPT ); Thu, 21 Jan 2021 11:53:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729690AbhAUQwr (ORCPT ); Thu, 21 Jan 2021 11:52:47 -0500 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 477DCC061786 for ; Thu, 21 Jan 2021 08:52:07 -0800 (PST) Received: by mail-pj1-x1034.google.com with SMTP id b5so2056580pjl.0 for ; Thu, 21 Jan 2021 08:52:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=fAAepta+Tqry3dwEzmnD+L2F5Kc/TshmNl4dFx/u10Q=; b=R3fyu0fHBeYFl8+KllQfgKo0GAS/EQ3LTyUPJWmtJgJW/t2r2NA/soXcdnOc8pwjm/ YV/nH3KzMnuXXy+Td3v5rqnS6jAeHQrnhXtOhTAQv63hH6VwAzzkOfuOwc80HNS7nZXA iwUKhfx4UYhsomTYcEZTkNhKDlu7ooAKDts+YM5YmpOwzG6J8t0dB8YD8RYL8OTuJSj1 32qJDCp60EUdnqxMsXAh5HADvCNHU86tiFMiKeMQ/HeGGwcm21NAi9E62FeYUtQyIXku xQEeiIB/L1QvWJJztzz969TQrziOFBR+ZwuU3EUSLovuW4F5EwGX6lm8HQpnlQwwQh+J cd7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=fAAepta+Tqry3dwEzmnD+L2F5Kc/TshmNl4dFx/u10Q=; b=FNkpIQS9bn/y6s5lbF53i+dwjiMpQgsqLjsAlyM+q1cLy6tm70ARtpy/LH7T71If0r jywD9SbgH3V/V8oXJX3yRFUsNCONXvtlhwWm/+/Ouz0PDFOzNE4GKWhd1+lK0gHYllvO 0dwxkItaNrmuc5wr9bU/kxCMeCnQkWbdmfqTWdL8T3DlWjgjlMFHhFlh6S6zTi7Xpeu3 c9y3nQkw73ntf07r96x1stSDDie5TyUqq5uxvUHk6szzVBmueHKPnWYm3issfqydCCMA hTMq2xNUrccjD32iJXrytO1LR5QoaK69SZjo4PjMcWsN09W7o+OnD7NXuBGZDto6NfsO QU+g== X-Gm-Message-State: AOAM533kbSTZf9HofhWIXygEAS8mFSU9bgO9JngL87F9wLJ/z9q1w7/+ FIX6XDeGYxZytpcNaeM3iX+ZHsvDXuV3jIUU X-Google-Smtp-Source: ABdhPJxvXPxDfEVdok2+F/Npp9UDEVvDC8WJg+QQg60J6Q9IZeX4O9BqYh34M6w1BtwugxcCclTKQg== X-Received: by 2002:a17:90a:4a0e:: with SMTP id e14mr317436pjh.200.1611247926455; Thu, 21 Jan 2021 08:52:06 -0800 (PST) Received: from localhost.localdomain ([2405:201:5c0b:3035:cd47:c5b3:4276:dc05]) by smtp.gmail.com with ESMTPSA id m27sm5924291pgn.62.2021.01.21.08.52.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jan 2021 08:52:05 -0800 (PST) From: Prathu Baronia X-Google-Original-From: Prathu Baronia To: linux-kernel@vger.kernel.org Cc: chintan.pandya@oneplus.com, Prathu Baronia , Catalin Marinas , Will Deacon , Vincenzo Frascino , "glider@google.com" , Geert Uytterhoeven , Andrew Morton , Anshuman Khandual , Andrey Konovalov , linux-arm-kernel@lists.infradead.org Subject: [PATCH 0/1] mm: Optimizing hugepage zeroing in arm64 Date: Thu, 21 Jan 2021 22:21:50 +0530 Message-Id: <20210121165153.17828-1-prathu.baronia@oneplus.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This patch removes the unnecessary kmap calls in the hugepage zeroing path and improves the timing by 62%. I had proposed a similar change in Apr-May'20 timeframe in memory.c where I proposed to clear out a hugepage by directly calling a memset over the whole hugepage but got the opposition that the change was not architecturally neutral. Upon revisiting this now I see significant improvement by removing around 2k barrier calls from the zeroing path. So hereby I propose an arm64 specific definition of clear_user_highpage(). Prathu Baronia (1): mm: Optimizing hugepage zeroing in arm64 arch/arm64/include/asm/page.h | 3 +++ arch/arm64/mm/copypage.c | 8 ++++++++ 2 files changed, 11 insertions(+) -- 2.17.1