Message ID | 20200930222130.4175584-6-kaleshsingh@google.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Wed, 30 Sep 2020 15:22:27 -0700 (PDT) Date: Wed, 30 Sep 2020 22:21:22 +0000 In-Reply-To: <20200930222130.4175584-1-kaleshsingh@google.com> Message-Id: <20200930222130.4175584-6-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 5/5] x86: mremap speedup - Enable HAVE_MOVE_PUD From: Kalesh Singh <kaleshsingh@google.com> Cc: surenb@google.com, minchan@google.com, joelaf@google.com, lokeshgidra@google.com, kaleshsingh@google.com, kernel-team@android.com, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>, Andrew Morton <akpm@linux-foundation.org>, Shuah Khan <shuah@kernel.org>, Kees Cook <keescook@chromium.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, Peter Zijlstra <peterz@infradead.org>, Sami Tolvanen <samitolvanen@google.com>, Arnd Bergmann <arnd@arndb.de>, Masahiro Yamada <masahiroy@kernel.org>, Krzysztof Kozlowski <krzk@kernel.org>, Frederic Weisbecker <frederic@kernel.org>, Hassan Naveed <hnaveed@wavecomp.com>, Christian Brauner <christian.brauner@ubuntu.com>, Mark Rutland <mark.rutland@arm.com>, Mark Brown <broonie@kernel.org>, Mike Rapoport <rppt@kernel.org>, Gavin Shan <gshan@redhat.com>, Steven Price <steven.price@arm.com>, Zhenyu Ye <yezhenyu2@huawei.com>, Jia He <justin.he@arm.com>, John Hubbard <jhubbard@nvidia.com>, Ram Pai <linuxram@us.ibm.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Ralph Campbell <rcampbell@nvidia.com>, Mina Almasry <almasrymina@google.com>, Sandipan Das <sandipan@linux.ibm.com>, Dave Hansen <dave.hansen@intel.com>, Brian Geffon <bgeffon@google.com>, Masami Hiramatsu <mhiramat@kernel.org>, SeongJae Park <sjpark@amazon.de>, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="UTF-8" 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: <linux-mm.kvack.org> |
Series | Speed up mremap on large regions | expand |
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
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 <kaleshsingh@google.com> --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+)