From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B02A2E77188 for ; Fri, 10 Jan 2025 13:37:21 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3C0A06B009E; Fri, 10 Jan 2025 08:37:21 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 36F2F6B00A0; Fri, 10 Jan 2025 08:37:21 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 20FA36B00A2; Fri, 10 Jan 2025 08:37:21 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id BEEBB6B009E for ; Fri, 10 Jan 2025 08:37:20 -0500 (EST) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 6C3341C7A08 for ; Fri, 10 Jan 2025 13:37:20 +0000 (UTC) X-FDA: 82991643840.22.C749530 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf28.hostedemail.com (Postfix) with ESMTP id B3314C0019 for ; Fri, 10 Jan 2025 13:37:18 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf28.hostedemail.com: domain of dev.jain@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=dev.jain@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1736516238; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UabO2srqHjy6CbVPxaGzsPYtL4A5rZg8+w/iwrs71wo=; b=JXaHOslxCt9fN+XcDp4HaUb/NB2mCgt0I9Ub2zH4qVFvJZ+ItVelI7IixZco6F4PsokWwe 08GiiIRzmx2a7dhWBldvE0JHnJjvAzCqb37WkSmwUv55qE9+CCIBHODoSMSdfDkh8o2428 WRPpTQKAkIviLyS2Pmmywc87Ewc0pPk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1736516238; a=rsa-sha256; cv=none; b=YtLpAXeRf53qZKZXT6JwlqPEzHySXID2Cdv7D0U3Qs5vZt9KnxAJ+/4gCPjdjC9TBNHwPd z+m6PD/AsrjO++BeqcnVAOEZIaAYepB07EUduG/F+hbQ8zyozFq0TaFhVzCGZY79M5OWdC T8crhyq5tKy/T//g/mMEzFVxjNVQxOw= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf28.hostedemail.com: domain of dev.jain@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=dev.jain@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 127FA1477; Fri, 10 Jan 2025 05:37:46 -0800 (PST) Received: from [10.50.66.95] (PW040MKD.arm.com [10.50.66.95]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 84F523F66E; Fri, 10 Jan 2025 05:37:01 -0800 (PST) Message-ID: Date: Fri, 10 Jan 2025 19:06:55 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 09/11] khugepaged: add mTHP support To: Nico Pache , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: ryan.roberts@arm.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, cl@gentwo.org, vbabka@suse.cz, mhocko@suse.com, apopple@nvidia.com, dave.hansen@linux.intel.com, will@kernel.org, baohua@kernel.org, jack@suse.cz, srivatsa@csail.mit.edu, haowenchao22@gmail.com, hughd@google.com, aneesh.kumar@kernel.org, yang@os.amperecomputing.com, peterx@redhat.com, ioworker0@gmail.com, wangkefeng.wang@huawei.com, ziy@nvidia.com, jglisse@google.com, surenb@google.com, vishal.moola@gmail.com, zokeefe@google.com, zhengqi.arch@bytedance.com, jhubbard@nvidia.com, 21cnbao@gmail.com, willy@infradead.org, kirill.shutemov@linux.intel.com, david@redhat.com, aarcange@redhat.com, raquini@redhat.com, sunnanyong@huawei.com, usamaarif642@gmail.com, audra@redhat.com, akpm@linux-foundation.org References: <20250108233128.14484-1-npache@redhat.com> <20250108233128.14484-10-npache@redhat.com> Content-Language: en-US From: Dev Jain In-Reply-To: <20250108233128.14484-10-npache@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: ygcf84u3yq6615gcfffqa9tdoopjnqz9 X-Rspamd-Queue-Id: B3314C0019 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1736516238-830974 X-HE-Meta: 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 79bLyzBb U7N9m/gxXh1XzVEdKru1eiNyVltuOmnyqj8V7M+udB2dFqaYr3pu5MetwM2Li0mjIDKfZxZAY9Dmg846jB5IWJkBOqMA7ZntRQjZi03GIMB4dvASXF8RrxrOrd0SsdN7iUHOeJVgaF/Dyx2u7TUnfkvzcGp3CP3RVojx8tQkAMuYhxsaseMJicE2hAc0IkNHy7Jh/PVOvkalOv3onrF2lQ6OuQg2XXFO8O4hIF7LNwDOk17s= 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 09/01/25 5:01 am, Nico Pache wrote: > Introduce the ability for khugepaged to collapse to different mTHP sizes. > While scanning a PMD range for potential hugepage collapse, track pages > in MIN_MTHP_ORDER chunks. Each bit represents a fully utilized region of > order MIN_MTHP_ORDER ptes. > > With this bitmap we can determine which mTHP sizes would be the most > efficient to collapse to if the PMD collapse is not suitible. > > Signed-off-by: Nico Pache For the actual bitmap optimization: give me some time, I'll get back to you.