From patchwork Wed Oct 14 00:53:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalesh Singh X-Patchwork-Id: 11837133 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C6E321130 for ; Wed, 14 Oct 2020 09:21:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9F5E7214D8 for ; Wed, 14 Oct 2020 09:21:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jw3IYuqh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730872AbgJNJVf (ORCPT ); Wed, 14 Oct 2020 05:21:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731004AbgJNJUk (ORCPT ); Wed, 14 Oct 2020 05:20:40 -0400 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4E98C0251BD for ; Tue, 13 Oct 2020 17:54:51 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id w32so1110520qvw.8 for ; Tue, 13 Oct 2020 17:54:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:cc; bh=+sRzkUE+scrQPOvt1hpaJRFlbY+mLiTASxfxA+AvDzY=; b=jw3IYuqhYk3bNCks48afsywsfyXpRda22JQ0j0vZleZASO4yZwS1bbAuklB3w73SDu nVAc5RTpyaQR83VAqaD5XtkkdxVMh+0WBUMs27BJbmYfuDR1MW5kWP4aQfuVJrwkj8hh ZUBpB5ib1AH/FLfmvSzZMAn6wB7H0IpN8t+GBiHXJ7r60tAz2aTiCECnYOE5ke/1OYb5 WloVpKbiCNwWXyA4+oAnzoKO4VvGLId6i4oBNn44HJh83Bd1hMW1gtw8oN04wN5EK01s gowS/qx8dBNy3W+Q/r388jANZjwOF21UjBdBC73CjCeTbc9Ads94fCnBq1FmwxpHOw7G axtA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:cc; bh=+sRzkUE+scrQPOvt1hpaJRFlbY+mLiTASxfxA+AvDzY=; b=N/sst9Im9ujXHMAUsKG8dXZUYoCFakaaFaTJBeNbdBb30jNSkC5rqrKczEEthvjD9S LRSgHov1XR4Vh1iHBu9fV61wegxbZ7jeOBVZ+0yKis0IvDCiBEG+QJR+1qKABKRk6eX3 XM0DPxcjzwz1kWm64H+UNlPbTRrYsGD4wTet3rOO7a5wjpWCin1+1ymDLZwd9Djf8LUz 97/5RGctB5YE93z6bun0N7qeIjGbXh7BgDC+XJ+fcA9M8KFnzlttlhXlq7lyxg8Xa+as lG45SiMt14fcQFbYvB2P2siMBtD9eqrS6H/JmxBOCIy4j4/0aoXB8S43YbdhpeoMz0mG msTg== X-Gm-Message-State: AOAM5337Gsg4j2+Bpg42Hm4+At4g42sonlHY435DGG/uAxx4yNzBSEns qL0SuCyJAQjOCvIM5zwH8J9cfY8eIJeg58aaTQ== X-Google-Smtp-Source: ABdhPJyfDvKvdmHyyap2eUwDhm0Me8oBd98Fxe3Nu61XFgLJneYAMnVgTd1Giuoe//Q/MlLcMZyeZ5E1JL9dS9zouw== Sender: "kaleshsingh via sendgmr" X-Received: from kaleshsingh.c.googlers.com ([fda3:e722:ac3:10:14:4d90:c0a8:2145]) (user=kaleshsingh job=sendgmr) by 2002:ad4:4150:: with SMTP id z16mr2651885qvp.50.1602636890894; Tue, 13 Oct 2020 17:54:50 -0700 (PDT) Date: Wed, 14 Oct 2020 00:53:10 +0000 In-Reply-To: <20201014005320.2233162-1-kaleshsingh@google.com> Message-Id: <20201014005320.2233162-6-kaleshsingh@google.com> Mime-Version: 1.0 References: <20201014005320.2233162-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v4 5/5] x86: mremap speedup - Enable HAVE_MOVE_PUD From: Kalesh Singh Cc: surenb@google.com, minchan@google.com, joelaf@google.com, lokeshgidra@google.com, kaleshsingh@google.com, kernel-team@android.com, "Kirill A . Shutemov" , Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Catalin Marinas , Will Deacon , x86@kernel.org, Shuah Khan , Peter Zijlstra , Kees Cook , "Aneesh Kumar K.V" , Arnd Bergmann , Sami Tolvanen , Masahiro Yamada , Krzysztof Kozlowski , Frederic Weisbecker , Hassan Naveed , Christian Brauner , Anshuman Khandual , Mark Rutland , Gavin Shan , Mike Rapoport , Steven Price , Jia He , John Hubbard , Ram Pai , Sandipan Das , Zi Yan , Mina Almasry , Ralph Campbell , Dave Hansen , Brian Geffon , Masami Hiramatsu , SeongJae Park , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org HAVE_MOVE_PUD enables remapping pages at the PUD level if both the source and destination addresses are PUD-aligned. With HAVE_MOVE_PUD enabled it can be inferred that there is approximately a 13x improvement in performance on x86. (See data below). ------- Test Results --------- The following results were obtained using a 5.4 kernel, by remapping a PUD-aligned, 1GB sized region to a PUD-aligned destination. The results from 10 iterations of the test are given below: Total mremap times for 1GB data on x86. All times are in nanoseconds. Control HAVE_MOVE_PUD 180394 15089 235728 14056 238931 25741 187330 13838 241742 14187 177925 14778 182758 14728 160872 14418 205813 15107 245722 13998 205721.5 15594 <-- Mean time in nanoseconds A 1GB mremap completion time drops from ~205 microseconds to ~15 microseconds on x86. (~13x speed up). Signed-off-by: Kalesh Singh Acked-by: Kirill A. Shutemov Cc: Andrew Morton Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: H. Peter Anvin Acked-by: Ingo Molnar --- Changes in v4: - Add Kirill's Acked-by. arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 835d93006bd6..e199760d54fc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -198,6 +198,7 @@ config X86 select HAVE_MIXED_BREAKPOINTS_REGS select HAVE_MOD_ARCH_SPECIFIC select HAVE_MOVE_PMD + select HAVE_MOVE_PUD select HAVE_NMI select HAVE_OPROFILE select HAVE_OPTPROBES