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multifd: Only send pages when packet are not empty

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We send packages without pages sometimes for sysnchronizanion.  The
iov functions do the right thing, but we will be changing this code in
future patches.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2019-01-04 19:12:35 +01:00
parent 50ccc488b0
commit ad24c7cb59
1 changed files with 12 additions and 6 deletions
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18
migration/ram.c
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@ -1088,9 +1088,12 @@ static void *multifd_send_thread(void *opaque)
break;
}
ret = qio_channel_writev_all(p->c, p->pages->iov, used, &local_err);
if (ret != 0) {
break;
if (used) {
ret = qio_channel_writev_all(p->c, p->pages->iov,
used, &local_err);
if (ret != 0) {
break;
}
}
qemu_mutex_lock(&p->mutex);
@ -1317,9 +1320,12 @@ static void *multifd_recv_thread(void *opaque)
p->num_pages += used;
qemu_mutex_unlock(&p->mutex);
ret = qio_channel_readv_all(p->c, p->pages->iov, used, &local_err);
if (ret != 0) {
break;
if (used) {
ret = qio_channel_readv_all(p->c, p->pages->iov,
used, &local_err);
if (ret != 0) {
break;
}
}
if (flags & MULTIFD_FLAG_SYNC) {