migration/multifd: Rename p->num_packets and clean it up

This field, no matter whether on src or dest, is only used for debugging
purpose.

They can even be removed already, unless it still more or less provide some
accounting on "how many packets are sent/recved for this thread".  The
other more important one is called packet_num, which is embeded in the
multifd packet headers (MultiFDPacket_t).

So let's keep them for now, but make them much easier to understand, by
doing below:

  - Rename both of them to packets_sent / packets_recved, the old
  name (num_packets) are waaay too confusing when we already have
  MultiFDPacket_t.packets_num.

  - Avoid worrying on the "initial packet": we know we will send it, that's
  good enough.  The accounting won't matter a great deal to start with 0 or
  with 1.

  - Move them to where we send/recv the packets.  They're:

    - multifd_send_fill_packet() for senders.
    - multifd_recv_unfill_packet() for receivers.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240202102857.110210-10-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>

diff --git a/migration/multifd.c b/migration/multifd.c
index 518f9de72346b2c34a28ef6203eab2c36621fc79..eca76e2c18cca62a156d861f9f5432f5c75949e3 100644 (file)
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -288,6 +288,8 @@ static void multifd_send_fill_packet(MultiFDSendParams *p)
 
         packet->offset[i] = cpu_to_be64(temp);
     }
+
+    p->packets_sent++;
 }
 
 static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
@@ -335,6 +337,7 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
 
     p->next_packet_size = be32_to_cpu(packet->next_packet_size);
     p->packet_num = be64_to_cpu(packet->packet_num);
+    p->packets_recved++;
 
     if (p->normal_num == 0) {
         return 0;
@@ -688,8 +691,6 @@ static void *multifd_send_thread(void *opaque)
         ret = -1;
         goto out;
     }
-    /* initial packet */
-    p->num_packets = 1;
 
     while (true) {
         qemu_sem_post(&multifd_send_state->channels_ready);
@@ -719,7 +720,6 @@ static void *multifd_send_thread(void *opaque)
             }
 
             multifd_send_fill_packet(p);
-            p->num_packets++;
             p->total_normal_pages += pages->num;
             trace_multifd_send(p->id, packet_num, pages->num, p->flags,
                                p->next_packet_size);
@@ -787,7 +787,7 @@ out:
 
     rcu_unregister_thread();
     migration_threads_remove(thread);
-    trace_multifd_send_thread_end(p->id, p->num_packets, p->total_normal_pages);
+    trace_multifd_send_thread_end(p->id, p->packets_sent, p->total_normal_pages);
 
     return NULL;
 }
@@ -1124,7 +1124,6 @@ static void *multifd_recv_thread(void *opaque)
         p->flags &= ~MULTIFD_FLAG_SYNC;
         trace_multifd_recv(p->id, p->packet_num, p->normal_num, flags,
                            p->next_packet_size);
-        p->num_packets++;
         p->total_normal_pages += p->normal_num;
         qemu_mutex_unlock(&p->mutex);
 
@@ -1150,7 +1149,7 @@ static void *multifd_recv_thread(void *opaque)
     qemu_mutex_unlock(&p->mutex);
 
     rcu_unregister_thread();
-    trace_multifd_recv_thread_end(p->id, p->num_packets, p->total_normal_pages);
+    trace_multifd_recv_thread_end(p->id, p->packets_recved, p->total_normal_pages);
 
     return NULL;
 }
@@ -1252,8 +1251,6 @@ void multifd_recv_new_channel(QIOChannel *ioc, Error **errp)
     }
     p->c = ioc;
     object_ref(OBJECT(ioc));
-    /* initial packet */
-    p->num_packets = 1;
 
     p->running = true;
     qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p,

diff --git a/migration/multifd.h b/migration/multifd.h
index 08f26ef3fe3a96d56f94559b23e8a0071184524b..2e4ad0dc56c1da59e042ec319121e994f593f831 100644 (file)
--- a/migration/multifd.h
+++ b/migration/multifd.h
@@ -124,7 +124,7 @@ typedef struct {
     /* size of the next packet that contains pages */
     uint32_t next_packet_size;
     /* packets sent through this channel */
-    uint64_t num_packets;
+    uint64_t packets_sent;
     /* non zero pages sent through this channel */
     uint64_t total_normal_pages;
     /* buffers to send */
@@ -174,8 +174,8 @@ typedef struct {
     MultiFDPacket_t *packet;
     /* size of the next packet that contains pages */
     uint32_t next_packet_size;
-    /* packets sent through this channel */
-    uint64_t num_packets;
+    /* packets received through this channel */
+    uint64_t packets_recved;
     /* ramblock */
     RAMBlock *block;
     /* ramblock host address */