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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=n+lpWY7yzSqCCV5o95LC07sMbZzhbvXKPBQ2SjIiJmO2HwRmheOgKlxzcaZ5tfsSAD Kys/rTkX4Hueq++OkY1HNUKYsqJ4sBp+hnhFilyJIQ2imzfhVkjlNa1YaZxfl/lxXVi1 FQYghs9VsGvSKWSYPhoi23kLBo0f+U942zOpe1CvrlMu9EyiWZthDDJ7Up+a9vkswtET 9IR96eGO46AIJixuIwB15VFeS3f6zgp933hocxrZvdpAiNjsLrIHjF7+wYnnzYnQHlf6 F4uvlJ6WBODMbIsrRH/pqGFwk3US5mPXalOGFJAteo4dbC5ZbA5WWXenp45HlKNcpDQY mRDw== X-Gm-Message-State: AOAM533OL/kXOk+8x0tEf6naEewLV6YTiVOgubKB7Q2gIsKwIa7ak8tF 4v9Zt58gSjaHUB5+Hj6Odaqr1SwTGiEWkKl/+A== X-Google-Smtp-Source: ABdhPJwWzjZJWRiWHzB7SAUtAP2b0hza2Y8k4Vz+cdfMrWfqG4bkLxAOeDCVeFU+z7OT3ayRXnDmDOceZZsYYAHZbg== X-Received: from kaleshsingh.c.googlers.com ([fda3:e722:ac3:10:14:4d90:c0a8:2145]) (user=kaleshsingh job=sendgmr) by 2002:ad4:4527:: with SMTP id l7mr3023885qvu.2.1601655756530; Fri, 02 Oct 2020 09:22:36 -0700 (PDT) Date: Fri, 2 Oct 2020 16:20:51 +0000 In-Reply-To: <20201002162101.665549-1-kaleshsingh@google.com> Message-Id: <20201002162101.665549-7-kaleshsingh@google.com> Mime-Version: 1.0 References: <20201002162101.665549-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.28.0.806.g8561365e88-goog Subject: [PATCH v2 6/6] x86: mremap speedup - Enable HAVE_MOVE_PUD From: Kalesh Singh X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201002_122243_236072_DF946D7A X-CRM114-Status: GOOD ( 15.53 ) X-Spam-Score: -6.5 (------) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-6.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:84a listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 1.2 MISSING_HEADERS Missing To: header -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_MED DKIMwl.org - Medium trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: joelaf@google.com, Mark Rutland , Gavin Shan , Brian Geffon , Anshuman Khandual , Peter Zijlstra , Catalin Marinas , kaleshsingh@google.com, Ram Pai , Dave Hansen , Will Deacon , lokeshgidra@google.com, linux-kselftest@vger.kernel.org, "H. Peter Anvin" , Christian Brauner , Shuah Khan , Mina Almasry , Jia He , Arnd Bergmann , "Aneesh Kumar K.V" , Masahiro Yamada , x86@kernel.org, Krzysztof Kozlowski , Ingo Molnar , Sami Tolvanen , kernel-team@android.com, Hassan Naveed , Masami Hiramatsu , Ralph Campbell , Kees Cook , minchan@google.com, Zhenyu Ye , John Hubbard , Frederic Weisbecker , Mark Brown , Borislav Petkov , Thomas Gleixner , Zi Yan , surenb@google.com, linux-arm-kernel@lists.infradead.org, SeongJae Park , linux-mm@kvack.org, Stephen Boyd , linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Andrew Morton , Mike Rapoport , Sandipan Das Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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