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 34639C433F5 for ; Wed, 23 Mar 2022 16:45:31 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6F3D56B0072; Wed, 23 Mar 2022 12:45:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 67D356B0073; Wed, 23 Mar 2022 12:45:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 51C496B0074; Wed, 23 Mar 2022 12:45:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.a.hostedemail.com [64.99.140.24]) by kanga.kvack.org (Postfix) with ESMTP id 406106B0072 for ; Wed, 23 Mar 2022 12:45:30 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 1060E3F9 for ; Wed, 23 Mar 2022 16:45:30 +0000 (UTC) X-FDA: 79276226820.11.1EC16F9 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf05.hostedemail.com (Postfix) with ESMTP id A56A4100037 for ; Wed, 23 Mar 2022 16:45:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=O6SFKONUTvLIQdQzfaDKFf4xslPRUYzgRdkwBAJy9AU=; b=F4bY1Ko8RtdLoTqRAtzKuUTF04 J4sfCqUaTCB7QFLrhyYUi+pV3sT6yV2XcC5i/mNuLOwkC4NVgmaoLyMcPUM4r7IEKCSqzjJNm5Aw3 u//0QeuZ+BGuAeSupgDQqjpHLdXUeRrwv9F2kltz0ql8mkB/mGE0PIstMn9r16vkswUHcIWHNUVvH n8tsBPOhe3SMRp/xEv4JhF5F5o9Yr5dBpBe7/cnTe6W5G0Bq8PXPga5CTE7syNTrLyk/J8GSAvGWA tt8ulAOL6+KZX3F1NnP9TpqbUe+Ibqk/7l/536dwpW4/1FnzY3TlRWjh1016z4o517klXtc0e2ObQ oqJTMGqQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nX46v-00EHrK-6J; Wed, 23 Mar 2022 16:45:25 +0000 Date: Wed, 23 Mar 2022 09:45:25 -0700 From: Christoph Hellwig To: Xiaoguang Wang Cc: linux-mm@kvack.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, xuyu@linux.alibaba.com, bostroesser@gmail.com Subject: Re: [RFC 1/3] mm/memory.c: introduce vm_insert_page(s)_mkspecial Message-ID: References: <20220318095531.15479-1-xiaoguang.wang@linux.alibaba.com> <20220318095531.15479-2-xiaoguang.wang@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220318095531.15479-2-xiaoguang.wang@linux.alibaba.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Stat-Signature: epss5gid3c66bwr8hzjtabgxci8pxmap Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=F4bY1Ko8; spf=none (imf05.hostedemail.com: domain of BATV+e62b50da79483f2da7a7+6786+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+e62b50da79483f2da7a7+6786+infradead.org+hch@bombadil.srs.infradead.org; dmarc=none X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: A56A4100037 X-HE-Tag: 1648053928-961381 X-Bogosity: Ham, tests=bogofilter, spamicity=0.016695, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: I relaly don't think we should add this amount of overhead to the core VM for a (relatively) irrelevant driver.