From ae526e32bd36cfb84045c8d2fd34e0b9e39a52f8 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Tue, 21 Aug 2018 16:10:25 +0800 Subject: migration: hold the lock only if it is really needed Try to hold src_page_req_mutex only if the queue is not empty Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Peter Xu Signed-off-by: Xiao Guangrong Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- include/qemu/queue.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/qemu/queue.h') diff --git a/include/qemu/queue.h b/include/qemu/queue.h index 59fd120..ac418ef 100644 --- a/include/qemu/queue.h +++ b/include/qemu/queue.h @@ -341,6 +341,7 @@ struct { \ /* * Simple queue access methods. */ +#define QSIMPLEQ_EMPTY_ATOMIC(head) (atomic_read(&((head)->sqh_first)) == NULL) #define QSIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL) #define QSIMPLEQ_FIRST(head) ((head)->sqh_first) #define QSIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next) -- cgit v1.1