Re: [Qemu-devel] use timer for adding latency to each block I/O

[Huaicheng Li]

> On May 16, 2016, at 11:33 AM, Stefan Hajnoczi <stefa...@gmail.com> wrote:
> 
> The way it's done in the "null" block driver is:
> 
> static coroutine_fn int null_co_common(BlockDriverState *bs)
> {
>    BDRVNullState *s = bs->opaque;
> 
>    if (s->latency_ns) {
>        co_aio_sleep_ns(bdrv_get_aio_context(bs), QEMU_CLOCK_REALTIME,
>                        s->latency_ns);
>    }
>    return 0;
> }

Thanks so much,  Stefan! It seems this is what I need.

Best,