Commit 126734c4 authored by Zhengui li's avatar Zhengui li Committed by Kevin Wolf
Browse files

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: default avatarZhengui li <lizhengui@huawei.com>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 1bffe1ae

block/vpc.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

        }