diff options
| author | Zhengui li <lizhengui@huawei.com> | 2019-03-15 22:04:38 +0800 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-04-30 15:29:00 +0200 |
| commit | 126734c4f7c38592f6f36ac9e02ab3aad13a656f (patch) | |
| tree | 3406f5bfe9f02dbbc63966c4ae892e869a730fab | |
| parent | 1bffe1ae7a7b707c3a14ea2ccd00d3609d3ce4d8 (diff) | |
vpc: unlock Coroutine lock to make IO submit Concurrently
Concurrent IO becomes serial IO because of the qemu Coroutine lock,
which reduce IO performance severely.
So unlock Coroutine lock before bdrv_co_pwritev and
bdrv_co_preadv to fix it.
Signed-off-by: Zhengui li <lizhengui@huawei.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/vpc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/vpc.c b/block/vpc.c index a902a4c54d..0c279b87c8 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -639,8 +639,10 @@ vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, qemu_iovec_reset(&local_qiov); qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); + qemu_co_mutex_unlock(&s->lock); ret = bdrv_co_preadv(bs->file, image_offset, n_bytes, &local_qiov, 0); + qemu_co_mutex_lock(&s->lock); if (ret < 0) { goto fail; } @@ -697,8 +699,10 @@ vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, qemu_iovec_reset(&local_qiov); qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); + qemu_co_mutex_unlock(&s->lock); ret = bdrv_co_pwritev(bs->file, image_offset, n_bytes, &local_qiov, 0); + qemu_co_mutex_lock(&s->lock); if (ret < 0) { goto fail; } |