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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 8D040C7618B for ; Mon, 29 Jul 2019 15:39:27 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 666E32067D for ; Mon, 29 Jul 2019 15:39:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 666E32067D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:54184 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hs7kE-0008UL-NO for qemu-devel@archiver.kernel.org; Mon, 29 Jul 2019 11:39:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49194) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hs7jp-00081B-3h for qemu-devel@nongnu.org; Mon, 29 Jul 2019 11:39:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hs7jn-0006k6-TX for qemu-devel@nongnu.org; Mon, 29 Jul 2019 11:39:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52820) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hs7jl-0006fR-95; Mon, 29 Jul 2019 11:38:57 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8C7083083392; Mon, 29 Jul 2019 15:38:56 +0000 (UTC) Received: from [10.3.116.93] (ovpn-116-93.phx2.redhat.com [10.3.116.93]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 14F6B6012A; Mon, 29 Jul 2019 15:38:53 +0000 (UTC) To: Stefan Hajnoczi , Vladimir Sementsov-Ogievskiy References: <20190725100550.33801-1-vsementsov@virtuozzo.com> <20190729150041.GF6771@stefanha-x1.localdomain> From: Eric Blake Openpgp: preference=signencrypt Autocrypt: addr=eblake@redhat.com; keydata= xsBNBEvHyWwBCACw7DwsQIh0kAbUXyqhfiKAKOTVu6OiMGffw2w90Ggrp4bdVKmCaEXlrVLU xphBM8mb+wsFkU+pq9YR621WXo9REYVIl0FxKeQo9dyQBZ/XvmUMka4NOmHtFg74nvkpJFCD TUNzmqfcjdKhfFV0d7P/ixKQeZr2WP1xMcjmAQY5YvQ2lUoHP43m8TtpB1LkjyYBCodd+LkV GmCx2Bop1LSblbvbrOm2bKpZdBPjncRNob73eTpIXEutvEaHH72LzpzksfcKM+M18cyRH+nP sAd98xIbVjm3Jm4k4d5oQyE2HwOur+trk2EcxTgdp17QapuWPwMfhaNq3runaX7x34zhABEB AAHNHkVyaWMgQmxha2UgPGVibGFrZUByZWRoYXQuY29tPsLAegQTAQgAJAIbAwULCQgHAwUV CgkICwUWAgMBAAIeAQIXgAUCS8fL9QIZAQAKCRCnoWtKJSdDahBHCACbl/5FGkUqJ89GAjeX RjpAeJtdKhujir0iS4CMSIng7fCiGZ0fNJCpL5RpViSo03Q7l37ss+No+dJI8KtAp6ID+PMz wTJe5Egtv/KGUKSDvOLYJ9WIIbftEObekP+GBpWP2+KbpADsc7EsNd70sYxExD3liwVJYqLc Rw7so1PEIFp+Ni9A1DrBR5NaJBnno2PHzHPTS9nmZVYm/4I32qkLXOcdX0XElO8VPDoVobG6 gELf4v/vIImdmxLh/w5WctUpBhWWIfQDvSOW2VZDOihm7pzhQodr3QP/GDLfpK6wI7exeu3P pfPtqwa06s1pae3ad13mZGzkBdNKs1HEm8x6zsBNBEvHyWwBCADGkMFzFjmmyqAEn5D+Mt4P zPdO8NatsDw8Qit3Rmzu+kUygxyYbz52ZO40WUu7EgQ5kDTOeRPnTOd7awWDQcl1gGBXgrkR pAlQ0l0ReO57Q0eglFydLMi5bkwYhfY+TwDPMh3aOP5qBXkm4qIYSsxb8A+i00P72AqFb9Q7 3weG/flxSPApLYQE5qWGSXjOkXJv42NGS6o6gd4RmD6Ap5e8ACo1lSMPfTpGzXlt4aRkBfvb NCfNsQikLZzFYDLbQgKBA33BDeV6vNJ9Cj0SgEGOkYyed4I6AbU0kIy1hHAm1r6+sAnEdIKj cHi3xWH/UPrZW5flM8Kqo14OTDkI9EtlABEBAAHCwF8EGAEIAAkFAkvHyWwCGwwACgkQp6Fr SiUnQ2q03wgAmRFGDeXzc58NX0NrDijUu0zx3Lns/qZ9VrkSWbNZBFjpWKaeL1fdVeE4TDGm I5mRRIsStjQzc2R9b+2VBUhlAqY1nAiBDv0Qnt+9cLiuEICeUwlyl42YdwpmY0ELcy5+u6wz mK/jxrYOpzXKDwLq5k4X+hmGuSNWWAN3gHiJqmJZPkhFPUIozZUCeEc76pS/IUN72NfprZmF Dp6/QDjDFtfS39bHSWXKVZUbqaMPqlj/z6Ugk027/3GUjHHr8WkeL1ezWepYDY7WSoXwfoAL 2UXYsMAr/uUncSKlfjvArhsej0S4zbqim2ZY6S8aRWw94J3bSvJR+Nwbs34GPTD4Pg== Organization: Red Hat, Inc. Message-ID: <1634fa73-a1bf-59cf-204d-b1115c912ea1@redhat.com> Date: Mon, 29 Jul 2019 10:38:52 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190729150041.GF6771@stefanha-x1.localdomain> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="vdXwoLcrgumIgKngxB3tAGPkgiSxGoJpC" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Mon, 29 Jul 2019 15:38:56 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v3 for-4.2 0/3] block: BDRV_REQ_PREFETCH X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, fam@euphon.net, qemu-block@nongnu.org, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --vdXwoLcrgumIgKngxB3tAGPkgiSxGoJpC Content-Type: multipart/mixed; boundary="6pQ2qVjR6BetJBQsRKwarw47ycgjIZFTg"; protected-headers="v1" From: Eric Blake To: Stefan Hajnoczi , Vladimir Sementsov-Ogievskiy Cc: kwolf@redhat.com, fam@euphon.net, qemu-block@nongnu.org, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org Message-ID: <1634fa73-a1bf-59cf-204d-b1115c912ea1@redhat.com> Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v3 for-4.2 0/3] block: BDRV_REQ_PREFETCH References: <20190725100550.33801-1-vsementsov@virtuozzo.com> <20190729150041.GF6771@stefanha-x1.localdomain> In-Reply-To: <20190729150041.GF6771@stefanha-x1.localdomain> --6pQ2qVjR6BetJBQsRKwarw47ycgjIZFTg Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 7/29/19 10:00 AM, Stefan Hajnoczi wrote: > On Thu, Jul 25, 2019 at 01:05:47PM +0300, Vladimir Sementsov-Ogievskiy = wrote: >> Hi all! >> >> Here is small new read flag: BDRV_REQ_PREFETCH, which in combination w= ith >> BDRV_REQ_COPY_ON_READ does copy-on-read without >> extra buffer for read data. This means that only parts that needs COR >> will be actually read and only corresponding buffers allocated, no mor= e. >> >> This allows to improve a bit block-stream and NBD_CMD_CACHE >> >> v3: rebase 02 on master, fix commit message of 03. >> >> v2: change interface to be just one flag BDRV_REQ_PREFETCH >> >> v1 was "[PATCH 0/3] block: blk_co_pcache" >> https://lists.gnu.org/archive/html/qemu-devel/2019-06/msg01047.html= >> >> Vladimir Sementsov-Ogievskiy (3): >> block: implement BDRV_REQ_PREFETCH >> block/stream: use BDRV_REQ_PREFETCH >> nbd: improve CMD_CACHE: use BDRV_REQ_PREFETCH >> >> include/block/block.h | 8 +++++++- >> block/io.c | 18 ++++++++++++------ >> block/stream.c | 20 +++++++------------- >> nbd/server.c | 43 +++++++++++++++++++++++++++++++++++-------= - >> 4 files changed, 61 insertions(+), 28 deletions(-) >> >> --=20 >> 2.18.0 >> >> >=20 > Reviewed-by: Stefan Hajnoczi >=20 I'm happy to queue this one through my NBD tree for 4.2. --=20 Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org --6pQ2qVjR6BetJBQsRKwarw47ycgjIZFTg-- --vdXwoLcrgumIgKngxB3tAGPkgiSxGoJpC Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEccLMIrHEYCkn0vOqp6FrSiUnQ2oFAl0/EwwACgkQp6FrSiUn Q2ocDAgAmWCuJPb5dYQZNHs1y3PYqNs1rlLQNE4wXn2d6Wdb3VJ/uZkI4QHJeFAf TgjMgWEgK7TSFoNo7VD8Swuj7mpjKrvqvTy9px4ykI9W1OKigqR9DkdySyEuyYx1 zaeWKjmoP86REd8xjajptdhLqsi+VCFjnfo/R6+NhRMpn37Aqcd+tO04dA5eIHmr cIoDhiFCME6tBWhvVCP50gXudnt6hC5qxhLbTO5uD9UKMc3ITxUXw6mBq5ABiAb7 utRNyrKvKOsWrP4tabVRL7LdbBjfqcu8QYUHcCfRaSjq1m9oJdSHbgCNjUdmY6Me eplcxTUwv7pAqmiz2yaYqJYQHQ8rdg== =2kTI -----END PGP SIGNATURE----- --vdXwoLcrgumIgKngxB3tAGPkgiSxGoJpC--