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Thu, 21 Jan 2021 08:52:05 -0800 (PST) From: Prathu Baronia X-Google-Original-From: Prathu Baronia To: linux-kernel@vger.kernel.org Subject: [PATCH 0/1] mm: Optimizing hugepage zeroing in arm64 Date: Thu, 21 Jan 2021 22:21:50 +0530 Message-Id: <20210121165153.17828-1-prathu.baronia@oneplus.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210121_115210_741153_B9F997DB X-CRM114-Status: GOOD ( 12.16 ) 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: Prathu Baronia , Catalin Marinas , Anshuman Khandual , chintan.pandya@oneplus.com, "glider@google.com" , Andrey Konovalov , Geert Uytterhoeven , Andrew Morton , Vincenzo Frascino , Will Deacon , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello! This patch removes the unnecessary kmap calls in the hugepage zeroing path and improves the timing by 62%. I had proposed a similar change in Apr-May'20 timeframe in memory.c where I proposed to clear out a hugepage by directly calling a memset over the whole hugepage but got the opposition that the change was not architecturally neutral. Upon revisiting this now I see significant improvement by removing around 2k barrier calls from the zeroing path. So hereby I propose an arm64 specific definition of clear_user_highpage(). Prathu Baronia (1): mm: Optimizing hugepage zeroing in arm64 arch/arm64/include/asm/page.h | 3 +++ arch/arm64/mm/copypage.c | 8 ++++++++ 2 files changed, 11 insertions(+) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel