From patchwork Thu Apr 29 10:44:16 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 51272 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 285E3B7D12 for ; Thu, 29 Apr 2010 20:47:34 +1000 (EST) Received: from localhost ([127.0.0.1]:55661 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O7RGu-0002Fe-VW for incoming@patchwork.ozlabs.org; Thu, 29 Apr 2010 06:47:08 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1O7REx-0001PT-In for qemu-devel@nongnu.org; Thu, 29 Apr 2010 06:45:07 -0400 Received: from [140.186.70.92] (port=44160 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O7REu-0001Ob-97 for qemu-devel@nongnu.org; Thu, 29 Apr 2010 06:45:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1O7REf-0005f6-NP for qemu-devel@nongnu.org; Thu, 29 Apr 2010 06:44:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:5461) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1O7REf-0005et-Fm for qemu-devel@nongnu.org; Thu, 29 Apr 2010 06:44:49 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o3TAigM7022106 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 29 Apr 2010 06:44:46 -0400 Received: from localhost.localdomain (dhcp-5-217.str.redhat.com [10.32.5.217]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o3TAie9h027382; Thu, 29 Apr 2010 06:44:40 -0400 From: Kevin Wolf To: qemu-devel@nongnu.org Date: Thu, 29 Apr 2010 12:44:16 +0200 Message-Id: <1272537856-9135-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. Cc: kwolf@redhat.com, dlaor@redhat.com, lcapitulino@redhat.com, avi@redhat.com, danken@redhat.com Subject: [Qemu-devel] [PATCH v2] block: Add wr_highest_sector blockstat X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This adds the wr_highest_sector blockstat which implements what is generally known as the high watermark. It is the highest offset of a sector written to the respective BlockDriverState since it has been opened. The query-blockstat QMP command is extended to add this value to the result, and also to add the statistics of the underlying protocol in a new "parent" field. Note that to get the "high watermark" of a qcow2 image, you need to look into the wr_highest_sector field of the parent (which can be a file, a host_device, ...). The wr_highest_sector of the qcow2 BlockDriverState itself is the highest offset on the _virtual_ disk that the guest has written to. Signed-off-by: Kevin Wolf --- block.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++------------ block_int.h | 1 + 2 files changed, 59 insertions(+), 15 deletions(-) diff --git a/block.c b/block.c index 91fecab..f463ec4 100644 --- a/block.c +++ b/block.c @@ -880,6 +880,10 @@ int bdrv_write(BlockDriverState *bs, int64_t sector_num, set_dirty_bitmap(bs, sector_num, nb_sectors, 1); } + if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { + bs->wr_highest_sector = sector_num + nb_sectors - 1; + } + return drv->bdrv_write(bs, sector_num, buf, nb_sectors); } @@ -1530,6 +1534,35 @@ void bdrv_stats_print(Monitor *mon, const QObject *data) qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); } +static QObject* bdrv_info_stats_bs(BlockDriverState *bs) +{ + QObject *res; + QDict *dict; + + res = qobject_from_jsonf("{ 'stats': {" + "'rd_bytes': %" PRId64 "," + "'wr_bytes': %" PRId64 "," + "'rd_operations': %" PRId64 "," + "'wr_operations': %" PRId64 "," + "'wr_highest_offset': %" PRId64 + "} }", + bs->rd_bytes, bs->wr_bytes, + bs->rd_ops, bs->wr_ops, + bs->wr_highest_sector * 512); + dict = qobject_to_qdict(res); + + if (*bs->device_name) { + qdict_put(dict, "device", qstring_from_str(bs->device_name)); + } + + if (bs->file) { + QObject *parent = bdrv_info_stats_bs(bs->file); + qdict_put_obj(dict, "parent", parent); + } + + return res; +} + /** * bdrv_info_stats(): show block device statistics * @@ -1544,19 +1577,34 @@ void bdrv_stats_print(Monitor *mon, const QObject *data) * - "wr_bytes": bytes written * - "rd_operations": read operations * - "wr_operations": write operations - * + * - "wr_highest_offset": Highest offset of a sector written since the + * BlockDriverState has been opened + * - "parent": Contains recursively the statistics of the underlying + * protocol (e.g. the host file for a qcow2 image). If there is no + * underlying protocol, this field is omitted. + * * Example: * * [ { "device": "ide0-hd0", * "stats": { "rd_bytes": 512, * "wr_bytes": 0, * "rd_operations": 1, - * "wr_operations": 0 } }, + * "wr_operations": 0, + * "wr_highest_offset": 0, + * "parent": { + * "stats": { "rd_bytes": 1024, + * "wr_bytes": 0, + * "rd_operations": 2, + * "wr_operations": 0, + * "wr_highest_offset": 0, + * } + * } } }, * { "device": "ide1-cd0", * "stats": { "rd_bytes": 0, * "wr_bytes": 0, * "rd_operations": 0, - * "wr_operations": 0 } } ] + * "wr_operations": 0, + * "wr_highest_offset": 0 } }, */ void bdrv_info_stats(Monitor *mon, QObject **ret_data) { @@ -1567,15 +1615,7 @@ void bdrv_info_stats(Monitor *mon, QObject **ret_data) devices = qlist_new(); QTAILQ_FOREACH(bs, &bdrv_states, list) { - obj = qobject_from_jsonf("{ 'device': %s, 'stats': {" - "'rd_bytes': %" PRId64 "," - "'wr_bytes': %" PRId64 "," - "'rd_operations': %" PRId64 "," - "'wr_operations': %" PRId64 - "} }", - bs->device_name, - bs->rd_bytes, bs->wr_bytes, - bs->rd_ops, bs->wr_ops); + obj = bdrv_info_stats_bs(bs); qlist_append_obj(devices, obj); } @@ -1834,9 +1874,12 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, cb, opaque); if (ret) { - /* Update stats even though technically transfer has not happened. */ - bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; - bs->wr_ops ++; + /* Update stats even though technically transfer has not happened. */ + bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; + bs->wr_ops ++; + if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { + bs->wr_highest_sector = sector_num + nb_sectors - 1; + } } return ret; diff --git a/block_int.h b/block_int.h index a3afe63..1a7240c 100644 --- a/block_int.h +++ b/block_int.h @@ -167,6 +167,7 @@ struct BlockDriverState { uint64_t wr_bytes; uint64_t rd_ops; uint64_t wr_ops; + uint64_t wr_highest_sector; /* Whether the disk can expand beyond total_sectors */ int growable;