From patchwork Mon Oct 5 15:40:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalesh Singh X-Patchwork-Id: 11816875 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 0B2AD6CA for ; Mon, 5 Oct 2020 15:41:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC167212CC for ; Mon, 5 Oct 2020 15:41:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="k5vN5lL8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728280AbgJEPld (ORCPT ); Mon, 5 Oct 2020 11:41:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728567AbgJEPlb (ORCPT ); Mon, 5 Oct 2020 11:41:31 -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 46FFDC0613A7 for ; Mon, 5 Oct 2020 08:41:31 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id h9so6088567qvr.3 for ; Mon, 05 Oct 2020 08:41:31 -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=bMnBZVJZ0gP6yWIahq+ggDCPy47CsnYvJiYw0n333nM=; b=k5vN5lL8u+dk7kk1dVwMid1XenomFqovMOogievds6K5jd20VXgxbl2GFmp9kcpSBP 6QTRISzHEYP0AwHteqslnrm2lDI4o6TNFzp3eLpPSYPYmosTOpjvr0Tcp5Evej0M8pOG NDN7DhJqs5Pc+2CCYJ9ilX5R5ax+1FWsqWBoizCPssscrao3rJH39V7UmzRBLCdDcBnv /c5HcLQ2tHg6VqfaazIcTVynqbkSBCGQGA1TdVjphaWV+Q9djLrapFHuVINGUeK58Iq2 qSVxl7d+7HUqT/LF6PXQtIH5YrCQ55CM67kkpySUh+9u+hzZIqVOJTquW9YdjteNKCac uGtg== 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=bMnBZVJZ0gP6yWIahq+ggDCPy47CsnYvJiYw0n333nM=; b=aMkk6m46ZC8f5bu+VFLzoa08/0iTF07/UOnLNxOWX0rc/WGF4K5dk7TmiJ2sDpWrQ/ SBqtRlqYH69wLDi1eC/XVaWkCBj4Ps3pgNK7/RwXW6aQA+hJ3rqLISQmq0AuKGWWhJTk 9vvMHCCylH7U1R59LI6BQf+PoAPSL1tv0LPKkZ3Wt1Ekdo0H+mN6nKi1adWTE8yUcayA XzdNkDsOBp+EyXOTCNvBiCYQGdeVL2rS3hub7l0LNWfWBLhdirEFWPPmeQjH/WMidukk 1W5B2bygp+gFUsN07+vsVIyS4pFSeQQHRxfcglMkQLEd9+4nn9Wg4qXV7RZICXGjZlH0 SfLg== X-Gm-Message-State: AOAM533ssE5OFpaZ1miIX7UsGYVNn0d89RnoDYy7P05C9/MMFFrp5Um9 TkY2YTq5loNCjIIcawBdiVxkm/B5MH1Sl2O84A== X-Google-Smtp-Source: ABdhPJxCbT3Tk7IhWxN1eyg5aVeN/8oSsg9g9VSjiEzr12333FvC/+nSCGHof4S0Ag8i51NGfN+bVC/79zdrCeEyvg== 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:ad4:4594:: with SMTP id x20mr337215qvu.4.1601912490402; Mon, 05 Oct 2020 08:41:30 -0700 (PDT) Date: Mon, 5 Oct 2020 15:40:08 +0000 In-Reply-To: <20201005154017.474722-1-kaleshsingh@google.com> Message-Id: <20201005154017.474722-6-kaleshsingh@google.com> Mime-Version: 1.0 References: <20201005154017.474722-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.28.0.806.g8561365e88-goog Subject: [PATCH v3 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, Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , Shuah Khan , Kees Cook , "Aneesh Kumar K.V" , Peter Zijlstra , Masahiro Yamada , Sami Tolvanen , Arnd Bergmann , Frederic Weisbecker , Krzysztof Kozlowski , Hassan Naveed , Christian Brauner , Mark Rutland , Mike Rapoport , Gavin Shan , Mark Brown , Jia He , Zhenyu Ye , John Hubbard , Dave Hansen , Jason Gunthorpe , Ralph Campbell , Mina Almasry , "Kirill A. Shutemov" , Ram Pai , Sandipan Das , Yang Shi , 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 --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 7101ac64bb20..ff6e2755cab8 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