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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B25CDC433E6 for ; Tue, 22 Dec 2020 13:57:02 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1ABCF23105 for ; Tue, 22 Dec 2020 13:57:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1ABCF23105 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=dm-devel-bounces@redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-420-QkBNeqZCNvy0iZpi3fzi5w-1; Tue, 22 Dec 2020 08:56:58 -0500 X-MC-Unique: QkBNeqZCNvy0iZpi3fzi5w-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 51BF0100F341; Tue, 22 Dec 2020 13:56:54 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CE3EA60C64; Tue, 22 Dec 2020 13:56:52 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 3519A5002C; Tue, 22 Dec 2020 13:56:49 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 0BMDuioY017119 for ; Tue, 22 Dec 2020 08:56:45 -0500 Received: by smtp.corp.redhat.com (Postfix) id 6117D2166B28; Tue, 22 Dec 2020 13:56:44 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast03.extmail.prod.ext.rdu2.redhat.com [10.11.55.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5C6DF2166B29 for ; Tue, 22 Dec 2020 13:56:42 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 01297811E78 for ; Tue, 22 Dec 2020 13:56:42 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-97-d_r-q3IXMjCqbsCMKW4Jdg-1; Tue, 22 Dec 2020 08:56:38 -0500 X-MC-Unique: d_r-q3IXMjCqbsCMKW4Jdg-1 Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1krhmQ-0001SZ-29; Tue, 22 Dec 2020 13:32:46 +0000 Date: Tue, 22 Dec 2020 13:32:46 +0000 From: Christoph Hellwig To: Palmer Dabbelt Message-ID: <20201222133246.GA5099@infradead.org> References: <30d39293-80a4-9ef5-92bb-6b6dec464be3@toxicpanda.com> MIME-Version: 1.0 In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: dm-devel@redhat.com Cc: linux-raid@vger.kernel.org, bvanassche@acm.org, snitzer@redhat.com, corbet@lwn.net, shuah@kernel.org, linux-doc@vger.kernel.org, josef@toxicpanda.com, linux-kernel@vger.kernel.org, Christoph Hellwig , song@kernel.org, dm-devel@redhat.com, michael.christie@oracle.com, linux-kselftest@vger.kernel.org, kernel-team@android.com, agk@redhat.com Subject: Re: [dm-devel] [PATCH v1 0/5] dm: dm-user: New target that proxies BIOs to userspace X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Mon, Dec 14, 2020 at 07:00:57PM -0800, Palmer Dabbelt wrote: > I haven't gotten a whole lot of feedback, so I'm inclined to at least have some > reasonable performance numbers before bothering with a v2. FYI, my other main worry beside duplicating nbd is that device mapper really is a stacked interface that sits on top of other block device. Turning this into something else that just pipes data to userspace seems very strange. -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel