Re: [PATCH v3 2/5] block-copy: let ratelimit handle a speed of 0

[Vladimir Sementsov-Ogievskiy]

14.06.2021 11:11, Emanuele Giuseppe Esposito wrote:
> From: Paolo Bonzini <pbonzini@redhat.com>
>
> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
> ---
>   block/block-copy.c | 28 +++++++++++-----------------
>   1 file changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/block/block-copy.c b/block/block-copy.c
> index 5808cfe657..943e30b7e6 100644
> --- a/block/block-copy.c
> +++ b/block/block-copy.c
> @@ -114,7 +114,6 @@ typedef struct BlockCopyState {
>   
>       SharedResource *mem;
>   
> -    uint64_t speed;
>       RateLimit rate_limit;
>   } BlockCopyState;
>   
> @@ -647,21 +646,19 @@ block_copy_dirty_clusters(BlockCopyCallState *call_state)
>               task->copy_range = false;
>           }
>   
> -        if (s->speed) {
> -            if (!call_state->ignore_ratelimit) {
> -                uint64_t ns = ratelimit_calculate_delay(&s->rate_limit, 0);
> -                if (ns > 0) {
> -                    block_copy_task_end(task, -EAGAIN);
> -                    g_free(task);
> -                    qemu_co_sleep_ns_wakeable(&call_state->sleep,
> -                                              QEMU_CLOCK_REALTIME, ns);
> -                    continue;
> -                }
> +        if (!call_state->ignore_ratelimit) {
> +            uint64_t ns = ratelimit_calculate_delay(&s->rate_limit, 0);
> +            if (ns > 0) {
> +                block_copy_task_end(task, -EAGAIN);
> +                g_free(task);
> +                qemu_co_sleep_ns_wakeable(&call_state->sleep,
> +                                            QEMU_CLOCK_REALTIME, ns);

Indentation broken. Can be fixed when applying, not worth resending

> +                continue;
>               }
> -
> -            ratelimit_calculate_delay(&s->rate_limit, task->bytes);
>           }
>   
> +        ratelimit_calculate_delay(&s->rate_limit, task->bytes);
> +
>           trace_block_copy_process(s, task->offset);
>   
>           co_get_from_shres(s->mem, task->bytes);
> @@ -853,10 +850,7 @@ void block_copy_set_skip_unallocated(BlockCopyState *s, 
> bool skip)
>   
>   void block_copy_set_speed(BlockCopyState *s, uint64_t speed)
>   {
> -    s->speed = speed;
> -    if (speed > 0) {
> -        ratelimit_set_speed(&s->rate_limit, speed, BLOCK_COPY_SLICE_TIME);
> -    }
> +    ratelimit_set_speed(&s->rate_limit, speed, BLOCK_COPY_SLICE_TIME);
>   
>       /*
>        * Note: it's good to kick all call states from here, but it should be 
> done


--
Best regards,
Vladimir