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 <pbonz...@redhat.com>

Reviewed-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Emanuele Giuseppe Esposito <eespo...@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