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authorXiao Guangrong <xiaoguangrong@tencent.com>2018-08-21 16:10:25 +0800
committerJuan Quintela <quintela@redhat.com>2018-08-22 12:36:18 +0200
commitae526e32bd36cfb84045c8d2fd34e0b9e39a52f8 (patch)
treebd6083598307d47aec30506bfe26b7ec0fe4ece5 /include/qemu
parent5e5fdcff28ebbba2004c6498218f506f364f1e8a (diff)
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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 <dgilbert@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'include/qemu')
-rw-r--r--include/qemu/queue.h1
1 files changed, 1 insertions, 0 deletions
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)