On Thu, Oct 29, 2015 at 10:14:25AM +0800, Fam Zheng wrote:
> void bdrv_drain(BlockDriverState *bs)
> {
> + BdrvChild *child;
> bool busy = true;
>
> + if (bs->drv && bs->drv->bdrv_drain) {
> + bs->drv->bdrv_drain(bs);
> + }
> + QLIST_FOREACH(child, &bs->children, next) {
> + bdrv_drain(child->bs);
> + }
> while (busy) {
> /* Keep iterating */
> bdrv_flush_io_queue(bs);Recursing calls aio_poll() once for each BDS node and I think it's not necessary and could be a performance problem. Stefan
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