From 126734c4f7c38592f6f36ac9e02ab3aad13a656f Mon Sep 17 00:00:00 2001 From: Zhengui li Date: Fri, 15 Mar 2019 22:04:38 +0800 Subject: 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 Reviewed-by: Paolo Bonzini Signed-off-by: Kevin Wolf --- block/vpc.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'block') diff --git a/block/vpc.c b/block/vpc.c index a902a4c..0c279b8 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; } -- cgit v1.1