diff options
author | Kevin Wolf <kwolf@redhat.com> | 2010-04-28 14:34:01 +0200 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2010-05-03 10:07:32 +0200 |
commit | 294cc35f3db84017e0c176c15dd9a1b711e8354d (patch) | |
tree | 764975d352dce48acfabe85c9d17bb58a1ee6a0f /block.c | |
parent | 419b19d9b427fad5ff2fa886d8cc217f7acee18c (diff) | |
download | hqemu-294cc35f3db84017e0c176c15dd9a1b711e8354d.zip hqemu-294cc35f3db84017e0c176c15dd9a1b711e8354d.tar.gz |
block: Add wr_highest_sector blockstat
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 <kwolf@redhat.com>
Diffstat (limited to 'block.c')
-rw-r--r-- | block.c | 73 |
1 files changed, 58 insertions, 15 deletions
@@ -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; |