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block: Move actual I/O throttling to BlockBackend

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-21 13:30:30 +01:00
parent 27ccdd5259
commit 441565b279
4 changed files with 13 additions and 14 deletions
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10
block/block-backend.c
View File

@ -716,6 +716,11 @@ static int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
return ret;
}
/* throttling disk I/O */
if (blk->public.throttle_state) {
throttle_group_co_io_limits_intercept(blk, bytes, false);
}
return bdrv_co_preadv(blk_bs(blk), offset, bytes, qiov, flags);
}
@ -730,6 +735,11 @@ static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
return ret;
}
/* throttling disk I/O */
if (blk->public.throttle_state) {
throttle_group_co_io_limits_intercept(blk, bytes, true);
}
if (!blk->enable_write_cache) {
flags |= BDRV_REQ_FUA;
}

10
block/io.c
View File

@ -1083,11 +1083,6 @@ int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
flags |= BDRV_REQ_COPY_ON_READ;
}
/* throttling disk I/O */
if (bs->blk && blk_get_public(bs->blk)->throttle_state) {
throttle_group_co_io_limits_intercept(bs, bytes, false);
}
/* Align read if necessary by padding qiov */
if (offset & (align - 1)) {
head_buf = qemu_blockalign(bs, align);
@ -1444,11 +1439,6 @@ int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
return ret;
}
/* throttling disk I/O */
if (bs->blk && blk_get_public(bs->blk)->throttle_state) {
throttle_group_co_io_limits_intercept(bs, bytes, true);
}
/*
* Align write if necessary by performing a read-modify-write cycle.
* Pad qiov with the read parts and be sure to have a tracked request not

5
block/throttle-groups.c
View File

@ -284,18 +284,17 @@ static void schedule_next_request(BlockBackend *blk, bool is_write)
* if necessary, and schedule the next request using a round robin
* algorithm.
*
* @bs: the current BlockDriverState
* @blk: the current BlockBackend
* @bytes: the number of bytes for this I/O
* @is_write: the type of operation (read/write)
*/
void coroutine_fn throttle_group_co_io_limits_intercept(BlockDriverState *bs,
void coroutine_fn throttle_group_co_io_limits_intercept(BlockBackend *blk,
unsigned int bytes,
bool is_write)
{
bool must_wait;
BlockBackend *token;
BlockBackend *blk = bs->blk;
BlockBackendPublic *blkp = blk_get_public(blk);
ThrottleGroup *tg = container_of(blkp->throttle_state, ThrottleGroup, ts);
qemu_mutex_lock(&tg->lock);

2
include/block/throttle-groups.h
View File

@ -40,7 +40,7 @@ void throttle_group_register_blk(BlockBackend *blk, const char *groupname);
void throttle_group_unregister_blk(BlockBackend *blk);
void throttle_group_restart_blk(BlockBackend *blk);
void coroutine_fn throttle_group_co_io_limits_intercept(BlockDriverState *bs,
void coroutine_fn throttle_group_co_io_limits_intercept(BlockBackend *blk,
unsigned int bytes,
bool is_write);