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 EC0C1CD4F54 for ; Wed, 20 May 2026 21:16:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=fU02cunUf5qx+CTJ998toCQden5I5L9eTw1htlE14B4=; b=etJ5sdW+MocBKsobkzwmGwcPId 6PWjqe+zf1Atxz2RsWJXWxqDEEXAwJOFxjJS4Lu9HhTs+mRtyEDQq2ZFjgk+Es6isiQjV8NhqkwOp qpHh4YZ39yla8NRkGOBE5FisqjRkZAgiLswjUbft76iss2WMT3BS+0dpVL+tDqjEugfXZH+cQLvXh MlsLEJmaLwzEF3afi6twtZhvB0hwVRIAOwvm7tsJ1KCOzoXvyo3KJ1rh1M3akvuxcnWbyiIHHtO1T J7XAvxdQSDrMDQmMnilEiorKIWUI6Sq5vi9QPFBnPKPT6YZiNvEEikrZx8xlwrxP6meTKoLTUe0Oy yy8p4Peg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPoGw-00000005oYS-051K; Wed, 20 May 2026 21:16:10 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPoGu-00000005oY8-1Q6i; Wed, 20 May 2026 21:16:08 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=fU02cunUf5qx+CTJ998toCQden5I5L9eTw1htlE14B4=; b=Ahb0j2Ei6nx5qSArSbx3QXwe7j nN0qnERaYLGpASZAP09LlU+EPQowKBvJPWhRsI00juo+im78mkgYHs+sP5ZWwXXBd7zRVmKWFHh91 ozzCsrVpwBFURX4JqqoPT0iEmX8E9NvxsJFClE4jAwVlL4pGe782qw3PvR74tDYThCZ3q+fwmuY2k TzdU054pRFbgWK4qDrlWLvQekRsHk+y4KM+0uWUFsCECk4H+2CGnBJFwpoiJbHR/MvjI7M4kc/Ssx zg1lHxgjWogJBSyWKXMDALCFwuerNCe/Tci5nkDTpyDfHMo2R9PAJoJdp1sxjZy6+MelEhK4vLDAA A5g2JMmA==; Received: from willy by casper.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPoGl-00000007air-0tv9; Wed, 20 May 2026 21:15:59 +0000 Date: Wed, 20 May 2026 22:15:59 +0100 From: Matthew Wilcox To: Barry Song Cc: "Liam R. Howlett" , Suren Baghdasaryan , Lorenzo Stoakes , akpm@linux-foundation.org, linux-mm@kvack.org, david@kernel.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 Subject: Re: [PATCH v2 0/5] mm: reduce mmap_lock contention and improve page fault performance Message-ID: References: <5zdaa5uv5oj27q3taopl3amops57ouxgyfsdveudz4ovmbdw7z@6lwrlyvmhcp2> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, May 21, 2026 at 05:14:20AM +0800, Barry Song wrote: > My understanding is that we should not blame applications here. This is 2026: > there are basically only two kinds of applications — single-threaded and > multi-threaded — and single-threaded applications are nearly extinct. all of the applications i run are either single threaded or don't fork. what multithreaded applications call fork?