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Tue, 7 May 2024 21:53:51 +0800 Message-ID: Date: Tue, 7 May 2024 21:53:51 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND PATCH] mm: align larger anonymous mappings on THP boundaries Content-Language: en-US To: David Hildenbrand , Ryan Roberts , Yang Shi CC: Matthew Wilcox , Yang Shi , , , , , , Ze Zuo References: <20231214223423.1133074-1-yang@os.amperecomputing.com> <1e8f5ac7-54ce-433a-ae53-81522b2320e1@arm.com> <1dc9a561-55f7-4d65-8b86-8a40fa0e84f9@arm.com> <6016c0e9-b567-4205-8368-1f1c76184a28@huawei.com> <2c14d9ad-c5a3-4f29-a6eb-633cdf3a5e9e@redhat.com> From: Kefeng Wang In-Reply-To: <2c14d9ad-c5a3-4f29-a6eb-633cdf3a5e9e@redhat.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm100001.china.huawei.com (7.185.36.93) X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 32E31C0011 X-Stat-Signature: un4n1c96xnak9f1emrktnf9h599rpu7r X-HE-Tag: 1715090036-45765 X-HE-Meta: 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 zDxpM9f+ /eB0th+pDCx2lCp1snHPwlrGRErd/FqPWFAesNlIXp4gaUq9HKbYsiHSOcrv8x/9IzQSLyt3nUJqzMZ4RuW2OezYcJZQQVVvgOZ8v0XiZ+QwUCjm6wg8+tgVTPf4vlgNuxalUCXwT4iLmqPleBk733Gnk250cUARL6WuvoAMLZBKueY3H/LhYzgDsbwMqoi26IUYG 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 2024/5/7 19:13, David Hildenbrand wrote: > >> https://github.com/intel/lmbench/blob/master/src/lat_mem_rd.c#L95 >> >>> suggest. If you want to try something semi-randomly; it might be >>> useful to rule >>> out the arm64 contpte feature. I don't see how that would be >>> interacting here if >>> mTHP is disabled (is it?). But its new for 6.9 and arm64 only. >>> Disable with >>> ARM64_CONTPTE (needs EXPERT) at compile time. >> I don't enabled mTHP, so it should be not related about ARM64_CONTPTE, >> but will have a try. After ARM64_CONTPTE disabled, memory read latency is similar with ARM64_CONTPTE enabled(default 6.9-rc7), still larger than align anon reverted. > > cont-pte can get active if we're just lucky when allocating pages in the > right order, correct Ryan? >