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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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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