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ee22a9d869
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Alberto Garcia ee22a9d869 qcow2: Merge the writing of the COW regions with the guest data 
If the guest tries to write data that results on the allocation of a
new cluster, instead of writing the guest data first and then the data
from the COW regions, write everything together using one single I/O
operation.

This can improve the write performance by 25% or more, depending on
several factors such as the media type, the cluster size and the I/O
request size.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-06-26 14:51:13 +02:00
..
accounting.c block: make accounting thread-safe 2017-06-16 07:55:00 +08:00
backup.c blockjob: introduce block_job_early_fail 2017-05-24 16:38:51 -04:00
blkdebug.c qapi: merge QInt and QFloat in QNum 2017-06-20 14:31:31 +02:00
blkreplay.c block: Do not unref bs->file on error in BD's open 2017-04-27 16:12:13 +02:00
blkverify.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
block-backend.c block: split BlockAcctStats creation and setup 2017-06-16 07:55:00 +08:00
bochs.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
cloop.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
commit.c commit: Fix completion with extra reference 2017-06-26 14:51:12 +02:00
crypto.c crypto: move 'opaque' parameter to (nearly) the end of parameter list 2017-05-09 14:41:47 +01:00
curl.c curl: do not do aio_poll when waiting for a free CURLState 2017-05-16 10:34:50 -04:00
dirty-bitmap.c block: protect modification of dirty bitmaps with a mutex 2017-06-16 07:55:00 +08:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
dmg.h dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
file-posix.c block/file-*: *_parse_filename() and colons 2017-05-29 15:39:54 +02:00
file-win32.c block/file-*: *_parse_filename() and colons 2017-05-29 15:39:54 +02:00
gluster.c block/gluster.c: Handle qdict_array_entries() failure 2017-06-09 08:41:29 -04:00
io.c block: use BDRV_POLL_WHILE() in bdrv_rw_vmstate() 2017-06-26 14:51:13 +02:00
iscsi-opts.c block/iscsi: statically link qemu_iscsi_opts 2017-01-27 18:07:58 +01:00
iscsi.c block/iscsi: enable filename option and parsing 2017-06-14 17:39:46 -04:00
linux-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
Makefile.objs block/vxhs.c: Add support for a new block device type called "vxhs" 2017-04-24 15:08:42 -04:00
mirror.c block: protect modification of dirty bitmaps with a mutex 2017-06-16 07:55:00 +08:00
nbd-client.c nbd: rename read_sync and friends 2017-06-15 11:04:06 +02:00
nbd-client.h nbd: drop unused NBDClientSession.is_unix field 2017-03-27 14:41:01 +02:00
nbd.c qapi: merge QInt and QFloat in QNum 2017-06-20 14:31:31 +02:00
nfs.c QAPI patches for 2017-06-09 2017-06-22 11:34:39 +01:00
null.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
parallels.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
qapi.c QAPI patches for 2017-06-09 2017-06-22 11:34:39 +01:00
qcow2-cache.c qcow2: Remove stale comment 2016-11-25 13:51:30 +01:00
qcow2-cluster.c qcow2: Merge the writing of the COW regions with the guest data 2017-06-26 14:51:13 +02:00
qcow2-refcount.c qcow2: Make distinction between zero cluster types obvious 2017-05-11 14:28:07 +02:00
qcow2-snapshot.c qcow2: Discard/zero clusters by byte count 2017-05-11 14:28:07 +02:00
qcow2.c qcow2: Merge the writing of the COW regions with the guest data 2017-06-26 14:51:13 +02:00
qcow2.h qcow2: Merge the writing of the COW regions with the guest data 2017-06-26 14:51:13 +02:00
qcow.c block/qcow.c: Fix memory leak in qcow_create() 2017-06-09 13:46:20 +02:00
qed-check.c qed: Use DIV_ROUND_UP 2016-06-07 18:19:24 +03:00
qed-cluster.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
qed-gencb.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-l2-cache.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-table.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
qed.c migration: migration.h was not needed 2017-05-18 19:20:59 +02:00
qed.h block: explicitly acquire aiocontext in timers that need it 2017-02-21 11:14:08 +00:00
quorum.c qapi: merge QInt and QFloat in QNum 2017-06-20 14:31:31 +02:00
raw-format.c block: Add .bdrv_truncate() error messages 2017-04-28 16:02:03 +02:00
rbd.c block/rbd: enable filename option and parsing 2017-06-14 17:39:46 -04:00
replication.c block: Make 'replication_state' an enum 2017-05-07 09:57:51 +03:00
sheepdog.c QAPI patches for 2017-06-09 2017-06-22 11:34:39 +01:00
snapshot.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
ssh.c qapi: merge QInt and QFloat in QNum 2017-06-20 14:31:31 +02:00
stream.c stream: fix crash in stream_start() when block_job_create() fails 2017-05-26 16:48:21 +02:00
throttle-groups.c throttle: Update throttle-groups.c documentation 2017-06-26 14:51:13 +02:00
trace-events block/vxhs.c: Add support for a new block device type called "vxhs" 2017-04-24 15:08:42 -04:00
vdi.c migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
vhdx-endian.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-log.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
vhdx.c migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
vpc.c migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
vvfat.c qapi: merge QInt and QFloat in QNum 2017-06-20 14:31:31 +02:00
vxhs.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
win32-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
write-threshold.c block: use bdrv_add_before_write_notifier 2016-10-07 13:34:07 +02:00