From patchwork Thu May 31 02:34:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 10440163 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6ACD660380 for ; Thu, 31 May 2018 02:36:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5A6CA295B7 for ; Thu, 31 May 2018 02:36:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4DAFF295CE; Thu, 31 May 2018 02:36:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BBAA7295B7 for ; Thu, 31 May 2018 02:36:41 +0000 (UTC) Received: from localhost ([::1]:41639 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fODSC-0004UR-UG for patchwork-qemu-devel@patchwork.kernel.org; Wed, 30 May 2018 22:36:40 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43344) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fODQp-0003TI-7C for qemu-devel@nongnu.org; Wed, 30 May 2018 22:35:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fODQj-0001lB-LX for qemu-devel@nongnu.org; Wed, 30 May 2018 22:35:15 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:52834 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fODQg-0001kN-Sg; Wed, 30 May 2018 22:35:06 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7275284257; Thu, 31 May 2018 02:35:06 +0000 (UTC) Received: from lemon.usersys.redhat.com (ovpn-12-47.pek2.redhat.com [10.72.12.47]) by smtp.corp.redhat.com (Postfix) with ESMTP id 388942023451; Thu, 31 May 2018 02:35:02 +0000 (UTC) From: Fam Zheng To: qemu-devel@nongnu.org Date: Thu, 31 May 2018 10:34:45 +0800 Message-Id: <20180531023445.5923-3-famz@redhat.com> In-Reply-To: <20180531023445.5923-1-famz@redhat.com> References: <20180531023445.5923-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 31 May 2018 02:35:06 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 31 May 2018 02:35:06 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'famz@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH 2/2] backup: Use copy offloading X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Fam Zheng , qemu-block@nongnu.org, Jeff Cody , Max Reitz , Stefan Hajnoczi Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP The implementation is similar to the 'qemu-img convert'. In the beginning of the job, offloaded copy is attempted. If it fails, further I/O will go through the existing bounce buffer code path. Signed-off-by: Fam Zheng --- block/backup.c | 93 +++++++++++++++++++++++++++++++++++------------------- block/trace-events | 1 + 2 files changed, 62 insertions(+), 32 deletions(-) diff --git a/block/backup.c b/block/backup.c index 4e228e959b..ab189693f4 100644 --- a/block/backup.c +++ b/block/backup.c @@ -45,6 +45,8 @@ typedef struct BackupBlockJob { QLIST_HEAD(, CowRequest) inflight_reqs; HBitmap *copy_bitmap; + bool use_copy_range; + int64_t copy_range_size; } BackupBlockJob; static const BlockJobDriver backup_job_driver; @@ -111,49 +113,70 @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job, cow_request_begin(&cow_request, job, start, end); for (; start < end; start += job->cluster_size) { +retry: if (!hbitmap_get(job->copy_bitmap, start / job->cluster_size)) { trace_backup_do_cow_skip(job, start); continue; /* already copied */ } - hbitmap_reset(job->copy_bitmap, start / job->cluster_size, 1); trace_backup_do_cow_process(job, start); - n = MIN(job->cluster_size, job->len - start); - - if (!bounce_buffer) { - bounce_buffer = blk_blockalign(blk, job->cluster_size); - } - iov.iov_base = bounce_buffer; - iov.iov_len = n; - qemu_iovec_init_external(&bounce_qiov, &iov, 1); - - ret = blk_co_preadv(blk, start, bounce_qiov.size, &bounce_qiov, - is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0); - if (ret < 0) { - trace_backup_do_cow_read_fail(job, start, ret); - if (error_is_read) { - *error_is_read = true; + if (!job->use_copy_range) { + hbitmap_reset(job->copy_bitmap, start / job->cluster_size, 1); + n = MIN(job->cluster_size, job->len - start); + if (!bounce_buffer) { + bounce_buffer = blk_blockalign(blk, job->cluster_size); } - hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1); - goto out; - } + iov.iov_base = bounce_buffer; + iov.iov_len = n; + qemu_iovec_init_external(&bounce_qiov, &iov, 1); - if (buffer_is_zero(iov.iov_base, iov.iov_len)) { - ret = blk_co_pwrite_zeroes(job->target, start, - bounce_qiov.size, BDRV_REQ_MAY_UNMAP); + ret = blk_co_preadv(blk, start, bounce_qiov.size, &bounce_qiov, + is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0); + if (ret < 0) { + trace_backup_do_cow_read_fail(job, start, ret); + if (error_is_read) { + *error_is_read = true; + } + hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1); + goto out; + } + + if (buffer_is_zero(iov.iov_base, iov.iov_len)) { + ret = blk_co_pwrite_zeroes(job->target, start, + bounce_qiov.size, BDRV_REQ_MAY_UNMAP); + } else { + ret = blk_co_pwritev(job->target, start, + bounce_qiov.size, &bounce_qiov, + job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0); + } + if (ret < 0) { + trace_backup_do_cow_write_fail(job, start, ret); + if (error_is_read) { + *error_is_read = false; + } + hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1); + goto out; + } } else { - ret = blk_co_pwritev(job->target, start, - bounce_qiov.size, &bounce_qiov, - job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0); - } - if (ret < 0) { - trace_backup_do_cow_write_fail(job, start, ret); - if (error_is_read) { - *error_is_read = false; + int nr_clusters; + + assert(QEMU_IS_ALIGNED(job->copy_range_size, job->cluster_size)); + n = MIN(job->copy_range_size, job->len - start); + n = MIN(bytes, n); + nr_clusters = DIV_ROUND_UP(n, job->cluster_size); + hbitmap_reset(job->copy_bitmap, start / job->cluster_size, + nr_clusters); + ret = blk_co_copy_range(blk, start, job->target, start, n, + is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0); + if (ret < 0) { + job->use_copy_range = false; + trace_backup_do_cow_copy_range_fail(job, start, ret); + hbitmap_set(job->copy_bitmap, start / job->cluster_size, + nr_clusters); + /* Retry with bounce buffer. */ + goto retry; } - hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1); - goto out; } /* Publish progress, guest I/O counts as progress too. Note that the @@ -665,6 +688,12 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, } else { job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size); } + job->use_copy_range = true; + job->copy_range_size = MIN_NON_ZERO(blk_get_max_transfer(job->common.blk), + blk_get_max_transfer(job->target)); + job->copy_range_size = MAX(job->cluster_size, + QEMU_ALIGN_UP(job->copy_range_size, + job->cluster_size)); /* Required permissions are already taken with target's blk_new() */ block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL, diff --git a/block/trace-events b/block/trace-events index 2d59b53fd3..c35287b48a 100644 --- a/block/trace-events +++ b/block/trace-events @@ -42,6 +42,7 @@ backup_do_cow_skip(void *job, int64_t start) "job %p start %"PRId64 backup_do_cow_process(void *job, int64_t start) "job %p start %"PRId64 backup_do_cow_read_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d" backup_do_cow_write_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d" +backup_do_cow_copy_range_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d" # blockdev.c qmp_block_job_cancel(void *job) "job %p"