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migration: Use atomic ops properly for page accountings

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To prepare for thread-safety on page accountings, at least below counters
need to be accessed only atomically, they are:

        ram_counters.transferred
        ram_counters.duplicate
        ram_counters.normal
        ram_counters.postcopy_bytes

There are a lot of other counters but they won't be accessed outside
migration thread, then they're still safe to be accessed without atomic
ops.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2022-10-11 17:55:51 -04:00 • committed by Juan Quintela
parent f3321554ef
commit 23b7576d78
4 changed files with 51 additions and 23 deletions
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4
migration/multifd.c
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@ -432,7 +432,7 @@ static int multifd_send_pages(QEMUFile *f)
transferred = ((uint64_t) pages->num) * p->page_size + p->packet_len;
qemu_file_acct_rate_limit(f, transferred);
ram_counters.multifd_bytes += transferred;
ram_counters.transferred += transferred;
stat64_add(&ram_atomic_counters.transferred, transferred);
qemu_mutex_unlock(&p->mutex);
qemu_sem_post(&p->sem);
@ -624,7 +624,7 @@ int multifd_send_sync_main(QEMUFile *f)
p->pending_job++;
qemu_file_acct_rate_limit(f, p->packet_len);
ram_counters.multifd_bytes += p->packet_len;
ram_counters.transferred += p->packet_len;
stat64_add(&ram_atomic_counters.transferred, p->packet_len);
qemu_mutex_unlock(&p->mutex);
qemu_sem_post(&p->sem);