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qemu-e2k/block
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Denis V. Lunev 156af3ac98 block: fix possible reorder of flush operations 
This patch reduce CPU usage of flush operations a bit. When we have one
flush completed we should kick only next operation. We should not start
all pending operations in the hope that they will go back to wait on
wait_queue.

Also there is a technical possibility that requests will get reordered
with the previous approach. After wakeup all requests are removed from
the wait queue. They become active and they are processed one-by-one
adding to the wait queue in the same order. Though new flush can arrive
while all requests are not put into the queue.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Tested-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
Message-id: 1471457214-3994-3-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Fam Zheng <famz@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
 		2016-08-18 14:36:49 +01:00
..
Makefile.objs block: Move bdrv_commit() to block/commit.c 2016-07-05 16:46:27 +02:00
accounting.c block: Clean up includes 2016-01-20 13:36:23 +01:00
archipelago.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
backup.c coroutine: move entry argument to qemu_coroutine_create 2016-07-13 13:26:02 +02:00
blkdebug.c block/blkdebug: Store config filename 2016-08-15 15:52:28 +02:00
blkreplay.c blkreplay: Switch .bdrv_co_discard() to byte-based 2016-07-20 14:11:55 +01:00
blkverify.c block: Convert bdrv_aio_writev() to BdrvChild 2016-07-05 16:46:26 +02:00
block-backend.c block: Convert BB interface to byte-based discards 2016-07-20 14:11:55 +01:00
bochs.c block: Convert bdrv_co_preadv/pwritev to BdrvChild 2016-07-05 16:46:27 +02:00
cloop.c block: Convert bdrv_pread(v) to BdrvChild 2016-07-05 16:46:27 +02:00
commit.c Improve block job rate limiting for small bandwidth values 2016-07-13 13:41:38 +02:00
crypto.c block: export LUKS specific data to qemu-img info 2016-07-26 17:46:37 +02:00
curl.c curl: Cast fd to int for DPRINTF 2016-08-17 19:57:54 +08:00
dirty-bitmap.c dirty-bitmap: operate with int64_t amount 2016-07-19 16:54:46 -04:00
dmg.c block: Convert bdrv_pread(v) to BdrvChild 2016-07-05 16:46:27 +02:00
gluster.c Pull request 2016-07-21 11:00:36 +01:00
io.c block: fix possible reorder of flush operations 2016-08-18 14:36:49 +01:00
iscsi.c iscsi: Switch .bdrv_co_discard() to byte-based 2016-07-20 14:24:25 +01:00
linux-aio.c linux-aio: Handle io_submit() failure gracefully 2016-08-11 09:42:35 +01:00
mirror.c mirror: finish earlier on error 2016-08-08 13:05:43 +02:00
nbd-client.c nbd: Convert to byte-based interface 2016-07-20 14:24:25 +01:00
nbd-client.h nbd: Limit nbdflags to 16 bits 2016-08-03 18:44:56 +02:00
nbd.c block/nbd: Store runtime option values 2016-08-15 15:52:29 +02:00
nfs.c coroutine: move entry argument to qemu_coroutine_create 2016-07-13 13:26:02 +02:00
null.c block/null: Implement bdrv_refresh_filename() 2016-06-16 15:20:37 +02:00
parallels.c block/parallels: check new image size 2016-08-05 09:59:06 +01:00
qapi.c qapi: Add new visit_complete() function 2016-07-06 10:52:04 +02:00
qcow.c qcow2: do not allocate extra memory 2016-07-26 17:46:37 +02:00
qcow2-cache.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
qcow2-cluster.c qcow2: Fix qcow2_get_cluster_offset() 2016-07-13 13:41:38 +02:00
qcow2-refcount.c block: Convert bdrv_discard() to byte-based 2016-07-20 14:11:55 +01:00
qcow2-snapshot.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
qcow2.c qcow2: do not allocate extra memory 2016-07-26 17:46:37 +02:00
qcow2.h qcow2: Implement .bdrv_co_pwritev() 2016-06-16 15:19:55 +02:00
qed-check.c qed: Use DIV_ROUND_UP 2016-06-07 18:19:24 +03:00
qed-cluster.c block: Clean up includes 2016-01-20 13:36:23 +01:00
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: Convert bdrv_aio_writev() to BdrvChild 2016-07-05 16:46:26 +02:00
qed.c coroutine: move entry argument to qemu_coroutine_create 2016-07-13 13:26:02 +02:00
qed.h util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
quorum.c block: Convert bdrv_aio_writev() to BdrvChild 2016-07-05 16:46:26 +02:00
raw-posix.c block: Convert .bdrv_aio_discard() to byte-based 2016-07-20 14:11:55 +01:00
raw-win32.c raw-posix: Switch paio_submit() to byte-based 2016-07-20 14:11:55 +01:00
raw_bsd.c raw_bsd: Convert to byte-based interface 2016-07-20 14:24:25 +01:00
rbd.c block: Convert .bdrv_aio_discard() to byte-based 2016-07-20 14:11:55 +01:00
sheepdog.c sheepdog: Switch .bdrv_co_discard() to byte-based 2016-07-20 14:24:25 +01:00
snapshot.c error: Remove NULL checks on error_propagate() calls 2016-06-20 16:38:13 +02:00
ssh.c block/ssh: Use QemuOpts for runtime options 2016-08-15 15:52:28 +02:00
stream.c Improve block job rate limiting for small bandwidth values 2016-07-13 13:41:38 +02:00
throttle-groups.c block: Move I/O throttling configuration functions to BlockBackend 2016-05-19 16:45:30 +02:00
trace-events trace-events: fix first line comment in trace-events 2016-08-12 10:36:01 +01:00
vdi.c block: Convert bdrv_co_preadv/pwritev to BdrvChild 2016-07-05 16:46:27 +02:00
vhdx-endian.c qemu-common: stop including qemu/bswap.h from qemu-common.h 2016-05-19 16:42:28 +02:00
vhdx-log.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
vhdx.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +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: fix metadata write regression 2016-07-13 13:41:39 +02:00
vpc.c block: Convert bdrv_co_preadv/pwritev to BdrvChild 2016-07-05 16:46:27 +02:00
vvfat.c vvfat: Fix qcow write target driver specification 2016-07-13 13:41:39 +02:00
win32-aio.c linux-aio: share one LinuxAioState within an AioContext 2016-07-18 15:09:31 +01:00
write-threshold.c block: Clean up includes 2016-01-20 13:36:23 +01:00