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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>
This commit is contained in:
Peter Xu 2024-02-02 18:28:43 +08:00
parent 83c560fb42
commit 05b7ec1890
2 changed files with 8 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
migration/multifd.c
View File

@ -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,

6
migration/multifd.h
View File

@ -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 */