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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77BEDC433F5 for ; Wed, 23 Mar 2022 16:45:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231992AbiCWQrR (ORCPT ); Wed, 23 Mar 2022 12:47:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245542AbiCWQrE (ORCPT ); Wed, 23 Mar 2022 12:47:04 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 747DB5FF29; Wed, 23 Mar 2022 09:45:28 -0700 (PDT) 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 Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org I relaly don't think we should add this amount of overhead to the core VM for a (relatively) irrelevant driver.