haraldwolff/qemu-patch-raspberry4
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Kevin Wolf 1cc8e54ada block: Avoid unnecessary aio_poll() in AIO_WAIT_WHILE() 
Commit 91af091f92 added an additional aio_poll() to BDRV_POLL_WHILE()
in order to make sure that all pending BHs are executed on drain. This
was the wrong place to make the fix, as it is useless overhead for all
other users of the macro and unnecessarily complicates the mechanism.

This patch effectively reverts said commit (the context has changed a
bit and the code has moved to AIO_WAIT_WHILE()) and instead polls in the
loop condition for drain.

The effect is probably hard to measure in any real-world use case
because actual I/O will dominate, but if I run only the initialisation
part of 'qemu-img convert' where it calls bdrv_block_status() for the
whole image to find out how much data there is copy, this phase actually
needs only roughly half the time after this patch.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2018-06-18 15:03:25 +02:00
..
accounting.c block/accounting: introduce latency histogram 2018-03-19 14:58:37 -05:00
backup.c job: Add error message for failing jobs 2018-05-30 13:31:01 +02:00
blkdebug.c block: Support BDRV_REQ_WRITE_UNCHANGED in filters 2018-05-15 16:15:21 +02:00
blkreplay.c block: Support BDRV_REQ_WRITE_UNCHANGED in filters 2018-05-15 16:15:21 +02:00
blkverify.c block: Support BDRV_REQ_WRITE_UNCHANGED in filters 2018-05-15 16:15:21 +02:00
block-backend.c block: Remove deprecated -drive option serial 2018-06-15 14:49:44 +02:00
bochs.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
cloop.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
commit.c job: Add error message for failing jobs 2018-05-30 13:31:01 +02:00
copy-on-read.c block: Support BDRV_REQ_WRITE_UNCHANGED in filters 2018-05-15 16:15:21 +02:00
create.c block/create: Mark blockdev-create stable 2018-05-30 13:31:18 +02:00
crypto.c block: Make remaining uses of qobject input visitor more robust 2018-06-15 14:49:44 +02:00
crypto.h qcow: convert QCow to use QCryptoBlock for encryption 2017-07-11 17:44:56 +02:00
curl.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
dirty-bitmap.c qapi: add x-block-dirty-bitmap-merge 2018-06-11 14:53:32 -04:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
dmg.h block: remove "qemu/osdep.h" from header file 2017-12-18 17:07:02 +03:00
file-posix.c block/file-posix: File locking during creation 2018-06-11 16:18:45 +02:00
file-win32.c file-win32: Switch to byte-based callbacks 2018-05-15 16:11:41 +02:00
gluster.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
io.c block: Avoid unnecessary aio_poll() in AIO_WAIT_WHILE() 2018-06-18 15:03:25 +02:00
iscsi-opts.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
iscsi.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
linux-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
Makefile.objs block: Add COR filter driver 2018-05-15 16:15:21 +02:00
mirror.c job: Add error message for failing jobs 2018-05-30 13:31:01 +02:00
nbd-client.c nbd/client: Relax handling of large NBD_CMD_BLOCK_STATUS reply 2018-05-04 08:23:39 -05:00
nbd-client.h nbd: BLOCK_STATUS for standard get_block_status function: client part 2018-03-13 15:43:48 -05:00
nbd.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
nfs.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
null.c null: Switch to byte-based read/write 2018-05-15 16:11:41 +02:00
nvme.c qobject: Modify qobject_ref() to return obj 2018-05-04 08:27:53 +02:00
parallels.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
parallels.h Clean up includes 2018-02-09 05:05:11 +01:00
qapi.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qcow.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
qcow2-bitmap.c block/qcow2-bitmap: fix free_bitmap_clusters 2018-06-11 16:18:45 +02:00
qcow2-cache.c qcow2: Allow configuring the L2 slice size 2018-02-13 17:00:00 +01:00
qcow2-cluster.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
qcow2-refcount.c qcow2: Repair OFLAG_COPIED when fixing leaks 2018-06-11 16:18:45 +02:00
qcow2-snapshot.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
qcow2.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
qcow2.h qcow2: Give the refcount cache the minimum possible size by default 2018-05-15 16:15:21 +02:00
qed-check.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed-cluster.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-l2-cache.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-table.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
qed.h qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
quorum.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
raw-format.c raw: Implement copy offloading 2018-06-01 14:41:47 +01:00
rbd.c rbd: New parameter key-secret 2018-06-15 14:49:44 +02:00
replication.c job: Move completion and cancellation to Job 2018-05-23 14:30:51 +02:00
sheepdog.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
snapshot.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
ssh.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
stream.c job: Add error message for failing jobs 2018-05-30 13:31:01 +02:00
throttle-groups.c Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00
throttle.c throttle: Fix crash on reopen 2018-06-11 16:18:45 +02:00
trace-events job: Move completion and cancellation to Job 2018-05-23 14:30:51 +02:00
vdi.c block: Make remaining uses of qobject input visitor more robust 2018-06-15 14:49:44 +02:00
vhdx-endian.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
vhdx-log.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
vhdx.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +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 vmdk: return ERROR when cluster sector is larger than vmdk limitation 2018-03-26 21:17:24 +02:00
vpc.c block: Factor out qobject_input_visitor_new_flat_confused() 2018-06-15 14:49:44 +02:00
vvfat.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
vxhs.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
win32-aio.c file-win32: Switch to byte-based callbacks 2018-05-15 16:11:41 +02:00
write-threshold.c Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00