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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=r9i4rFwlO0Ri1Z8TnSbsRvxZfWKWakVdyJrZ8aN7lSY=; b=iqrKQSsoP7R2UCby7/fygevsOeJQhadzUmihE/pSM0XQQA8nydTTIgqEQGyhPBTkbn ApSV2z4Lp1lGlUdnr+9LHHUcQbsJ5QZYVV7LBPwoCDxaKto4daXBOCSSAspChNSujHbY iT5ZUTt3OoBuAASSiILmacD0sh2AUaey4EWBrygM8jqGkd7SuWfnxfHopLYzWc1X20YI H5qry4YSXUoHLb/sQotQBHfZQWDJtKMAchjYaxHdIo4ubvPdeZfrq3NPYGwwLI80HaAA z0KP826sMDLDjfgAfFA5Bdj0f0FngUEzV080k9DELUe1iC7mVnCLFc9d81Ek0tMHZcKP D2oA== X-Gm-Message-State: AOAM531N2WsqVnni6BdjvUc9t8PlDhdHziZxAyejizrf/6JX82BJJmT2 rYzcZ1v+LwVIS7tm9h2D0TMOg9yPOgRYqIX1nA== X-Google-Smtp-Source: ABdhPJw/sR64l5kK5cZN6wHaMabXV7sFr12f7agBjeiB0rYDcGu7AUGvx40hqtjxrcgjvKmLH0L0Diy+P9Slii6SiQ== X-Received: from kaleshsingh.c.googlers.com ([fda3:e722:ac3:10:14:4d90:c0a8:2145]) (user=kaleshsingh job=sendgmr) by 2002:ad4:58e3:: with SMTP id di3mr4707465qvb.54.1601504537414; Wed, 30 Sep 2020 15:22:17 -0700 (PDT) Date: Wed, 30 Sep 2020 22:21:21 +0000 In-Reply-To: <20200930222130.4175584-1-kaleshsingh@google.com> Message-Id: <20200930222130.4175584-5-kaleshsingh@google.com> Mime-Version: 1.0 References: <20200930222130.4175584-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH 4/5] arm64: 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-20200930_182221_634726_118C5864 X-CRM114-Status: GOOD ( 15.33 ) X-Spam-Score: -7.0 (-------) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-7.0 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:f49 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list -0.0 SPF_PASS SPF: sender matches SPF record 1.2 MISSING_HEADERS Missing To: header 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.5 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 , Peter Zijlstra , Catalin Marinas , kaleshsingh@google.com, Ram Pai , Kamalesh Babulal , 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 , Jason Gunthorpe , Ingo Molnar , Sami Tolvanen , kernel-team@android.com, Dave Martin , 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, 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 19x improvement in performance on arm64. (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 arm64. All times are in nanoseconds. Control HAVE_MOVE_PUD 1247761 74271 1219896 46771 1094792 59687 1227760 48385 1043698 76666 1101771 50365 1159896 52500 1143594 75261 1025833 61354 1078125 48697 1134312.6 59395.7 <-- Mean time in nanoseconds A 1GB mremap completion time drops from ~1.1 milliseconds to ~59 microseconds on arm64. (~19x speed up). Signed-off-by: Kalesh Singh --- arch/arm64/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 844d089668e3..4d521f0a5863 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -122,6 +122,7 @@ config ARM64 select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND select HAVE_MOVE_PMD + select HAVE_MOVE_PUD select HAVE_PCI select HAVE_ACPI_APEI if (ACPI && EFI) select HAVE_ALIGNED_STRUCT_PAGE if SLUB