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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 51B3FCD4F5E for ; Wed, 20 May 2026 21:36:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ICPHCTI2svLfzonHDKDFBtcfpeJR6SUub3HGUQ/RtHE=; b=qJ7dUzqq2Qwq+K 3Icce5RvmTeoGj7nb3dwXzFa7vwq3IZcRY8DiVjP7PO4Q7yy+vDnoT3kU8iexaCdZ8LFKjOiAIB7b q7lqi84RnBrpTLMH+yJlKlNZouJ5BA6ZM+yc3rsaberd0gLM2GS+KYjyL468ae1r4b/PPnTbiBQpE 0e7C/UzEUR7FmRevo4Sp1k4JA4W7krhAl3thkl/+vVef2yclcRnp88wW+8pDnkw5vtFI+fDuJAEcf VIgqfI3pRhx3Yxvrq82KuV7ebnwGIfFtbVbXimZsHOvDrgTj8GtrWPb5tM6VXaPOAf4wyjDn4aiSi nXHnBOfILe/webdNpQyA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPoa1-00000005rH2-1i7u; Wed, 20 May 2026 21:35:53 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPoZz-00000005rGE-2NE2; Wed, 20 May 2026 21:35:51 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id BA8D660098; Wed, 20 May 2026 21:35:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2CFDF1F00A3D; Wed, 20 May 2026 21:35:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779312950; bh=M4GlRj+JVNLEfSh+vgkfiIIQJ0TzUbveTmDP2V2Vkzs=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=eyp0NelBt18y71uxyltCpRt5OnNFBW8axOeq1fjE5NvXM8d3rxebFRy0EoPeSOMnq 1ggxn6O6Q37L5TAs6pci0ZUofIhKmeCd6/LvI1Xk/YqQ88n1dMEv0pO9JtXc2uKC0M ND+R1svTmDFr+E6HnUbF0zC+9c+rwnkItvU3DLvP9jGy25gnQJ09AH8v1htMUdhww6 51m/m0/HqRCbJMfu5PTLNMNNdMugTXPkHXY2+F47/4d8Kf/yYicHZR4vlx0GSjJ9Sn hWzUfinW+0dkiP/hm67VEnrEEQhQIn7km7Thh0TUIna267F4RzyNfV6xulLyhthA8w vI7NzcgDlEb3Q== Message-ID: <3be9475b-0e8a-4df8-a130-4262f993973d@kernel.org> Date: Wed, 20 May 2026 23:35:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/5] mm: reduce mmap_lock contention and improve page fault performance To: Matthew Wilcox , Barry Song Cc: "Liam R. Howlett" , Suren Baghdasaryan , Lorenzo Stoakes , akpm@linux-foundation.org, linux-mm@kvack.org, vbabka@kernel.org, rppt@kernel.org, mhocko@suse.com, jack@suse.cz, pfalcato@suse.de, wanglian@kylinos.cn, chentao@kylinos.cn, lianux.mm@gmail.com, kunwu.chan@gmail.com, liyangouwen1@oppo.com, chrisl@kernel.org, kasong@tencent.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, bhe@redhat.com, youngjun.park@lge.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, Nanzhe Zhao References: <5zdaa5uv5oj27q3taopl3amops57ouxgyfsdveudz4ovmbdw7z@6lwrlyvmhcp2> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gNS8yMC8yNiAyMzoxNSwgTWF0dGhldyBXaWxjb3ggd3JvdGU6Cj4gT24gVGh1LCBNYXkgMjEs IDIwMjYgYXQgMDU6MTQ6MjBBTSArMDgwMCwgQmFycnkgU29uZyB3cm90ZToKPj4gTXkgdW5kZXJz dGFuZGluZyBpcyB0aGF0IHdlIHNob3VsZCBub3QgYmxhbWUgYXBwbGljYXRpb25zIGhlcmUuIFRo aXMgaXMgMjAyNjoKPj4gdGhlcmUgYXJlIGJhc2ljYWxseSBvbmx5IHR3byBraW5kcyBvZiBhcHBs aWNhdGlvbnMg4oCUIHNpbmdsZS10aHJlYWRlZCBhbmQKPj4gbXVsdGktdGhyZWFkZWQg4oCUIGFu ZCBzaW5nbGUtdGhyZWFkZWQgYXBwbGljYXRpb25zIGFyZSBuZWFybHkgZXh0aW5jdC4KPiAKPiBh bGwgb2YgdGhlIGFwcGxpY2F0aW9ucyBpIHJ1biBhcmUgZWl0aGVyIHNpbmdsZSB0aHJlYWRlZCBv ciBkb24ndCBmb3JrLgo+IHdoYXQgbXVsdGl0aHJlYWRlZCBhcHBsaWNhdGlvbnMgY2FsbCBmb3Jr PwoKVHJhZGl0aW9uYWxseSB0aGUgcHJvYmxlbSB3YXMgcmFuZG9tIGxpYnJhcmllcyB1c2luZyBm b3JrK2V4ZWN2ZSB0byBsYXVuY2ggb3RoZXIKcHJvZ3JhbXMgLi4uIGluc3RlYWQgb2YgdXNpbmcg YWx0ZXJuYXRpdmVzIGxpa2UgcG9zaXhfc3B3YW4gKHNvbWUgdXNlIGNhc2VzCnJlcXVpcmUgbW9y ZSB3b3JrIGRvbmUgYmVmb3JlIGV4ZWN2ZSBhbmQgY2Fubm90IHlldCBzd2l0Y2ggdG8gdGhhdCku IEknZCBob3BlCnRoYXQgdGhhdCBpcyBsZXNzIG9mIGEgcHJvYmxlbSBvbiBBbmRyb2lkLgoKSSBh c3N1bWUgQW5kcm9pZCB6eWdvdGUgbWlnaHQgYmUgbXVsdGkgdGhyZWFkZWQ/IE1heWJlIHNzaGQg YXMgd2VsbD8gU3lzdGVtZD8KQnV0IEknZCBiZSBzdXJwcmlzZWQgaWYgdGhlcmUgYXJlIHJlYWxs eSBwZXJmb3JtYW5jZSBpbXBsaWNhdGlvbnMuCgpOb3Qgc3VyZSBhYm91dCB3ZWJicm9zd2VycyAu Li4uIEkgdGhpbmsgbW9zdCBvZiB0aGVtIHN3aXRjaGVkIHRvIGZvcmsgc2VydmVycywKd2hlcmUg SSB3b3VsZCBhc3N1bWUgZm9yayBzZXJ2ZXJzIHdvdWxkIGJlIHNpbmdsZS10aHJlYWRlZC4KClNv LCB5ZWFoLCBnZXR0aW5nIGEgY2xlYXIgdW5kZXJzdGFuZGluZyBob3cgdGhpcyBlbmRzIHVwIGJl aW5nIGEgcHJvYmxlbSBvbgpBbmRyb2lkIHdvdWxkIGJlIGdyZWF0LgoKLS0gCkNoZWVycywKCkRh dmlkCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51 eC1yaXNjdiBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRw Oi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==