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[90.233.221.122]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-54ad6508142sm2049380e87.172.2025.03.27.05.16.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Mar 2025 05:16:04 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Thu, 27 Mar 2025 13:16:01 +0100 To: Ryan Roberts Cc: Catalin Marinas , Will Deacon , Pasha Tatashin , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , David Hildenbrand , "Matthew Wilcox (Oracle)" , Mark Rutland , Anshuman Khandual , Alexandre Ghiti , Kevin Brodsky , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 00/11] Perf improvements for hugetlb and vmalloc on arm64 Message-ID: References: <20250304150444.3788920-1-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250304150444.3788920-1-ryan.roberts@arm.com> X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 046514000D X-Stat-Signature: h1t8ud5psufqe1fa5ffnm5ieqsewbuuf X-HE-Tag: 1743077767-317207 X-HE-Meta: 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 zK7OQHzH IZOKyoVr9gfZjoHiwAYg4jC1WnrI9d37/kejT8g2C0zj0DdgmiXo8NaWV0f3+zg7HrB0N7spmn2z9VrFkTukCKjafkP6ohlKaYSf5o74vwd1iRYbOH50XEsGVC5VKYPj9MraJLY3IzanWb/ZPie7gMSJE0jRL9BYWoJBgEKINFzVT6y0KrLh2NZhV5ah3QvYOG31qAw/0YwRjCS/n5LZLl+0AyX/+v+vcvwskkidntqEY/ZFnsIt9zq58PIPMsf3QInKqGpMTNDexz0oEkMDezc5Yv4TexSgbonJR3UaqaRlYjuQAWyWY1wMQfht+d7lGcAMpuiQAazxP04ZCNyjvW+gv/m6wfP+i2rrZolpguBDWLT85AtrDa4EjwLDrT8lG0uzkRYO68kUIc30= 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: List-Subscribe: List-Unsubscribe: On Tue, Mar 04, 2025 at 03:04:30PM +0000, Ryan Roberts wrote: > Hi All, > > This is v3 of a series to improve performance for hugetlb and vmalloc on arm64. > Although some of these patches are core-mm, advice from Andrew was to go via the > arm64 tree. Hopefully I can get some ACKs from mm folks. > > The 2 key performance improvements are 1) enabling the use of contpte-mapped > blocks in the vmalloc space when appropriate (which reduces TLB pressure). There > were already hooks for this (used by powerpc) but they required some tidying and > extending for arm64. And 2) batching up barriers when modifying the vmalloc > address space for upto 30% reduction in time taken in vmalloc(). > > vmalloc() performance was measured using the test_vmalloc.ko module. Tested on > Apple M2 and Ampere Altra. Each test had loop count set to 500000 and the whole > test was repeated 10 times. > I will have a look and review just give me some time :) -- Uladzislau Rezki