diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2019-09-16 20:53:24 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2019-10-10 10:56:17 +0200 |
| commit | d710cf575ad5fb3ab329204620de45bfe50caa53 (patch) | |
| tree | d5928b6caa17ae1a2c53abad4fb9e5183d7b83c5 /block/qcow2.h | |
| parent | 6aa7a2631b88412cc85aeb67c1e188517c54fa5e (diff) | |
| download | qemu-d710cf575ad5fb3ab329204620de45bfe50caa53.zip | |
block/qcow2: introduce parallel subrequest handling in read and write
It improves performance for fragmented qcow2 images.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190916175324.18478-6-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/qcow2.h')
| -rw-r--r-- | block/qcow2.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index a488d761ff..f51f478e34 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -65,6 +65,9 @@ #define QCOW2_MAX_BITMAPS 65535 #define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS) +/* Maximum of parallel sub-request per guest request */ +#define QCOW2_MAX_WORKERS 8 + /* indicate that the refcount of the referenced cluster is exactly one. */ #define QCOW_OFLAG_COPIED (1ULL << 63) /* indicate that the cluster is compressed (they never have the copied flag) */ |