[PULL 07/19] migration/multifd: sync packet_num after all thread are done

Juan Quintela
2019-07-11T10:44:39Z

From: Wei Yang <richardw.yang@linux.intel.com>

Notification from recv thread is not ordered, which means we may be
notified by one MultiFDRecvParams but adjust packet_num for another.

Move the adjustment after we are sure each recv thread are sync-ed.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20190604023540.26532-1-richardw.yang@linux.intel.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
migration/ram.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index d3d72b6f4f..96c84f770a 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1291,15 +1291,15 @@ static void multifd_recv_sync_main(void)

trace_multifd_recv_sync_main_wait(p->id);
qemu_sem_wait(&multifd_recv_state->sem_sync);
+ }
+ for (i = 0; i < migrate_multifd_channels(); i++) {
+ MultiFDRecvParams *p = &multifd_recv_state->params[i];
+
qemu_mutex_lock(&p->mutex);
if (multifd_recv_state->packet_num < p->packet_num) {
multifd_recv_state->packet_num = p->packet_num;
}
qemu_mutex_unlock(&p->mutex);
- }
- for (i = 0; i < migrate_multifd_channels(); i++) {
- MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
trace_multifd_recv_sync_main_signal(p->id);
qemu_sem_post(&p->sem_sync);
}
--
2.21.0