prov/shm: adjust the order of smr_region fields.

xpmem is a opt-in feature and not enabled by default.
The previous commit e0906f6 inserts xpmem related fields
in the middle of smr_region struct, which makes the size
of smr_region struct increase from 104 (2 cache lines) to 144
( 3 cache lines). xpmem_cap_self, xpmem_self, and xpmem_peer
are not used in fast path while they make the fields (offsets)
used in the fast path shifted to the next cache line and causes more
cache misses.

This patch moves the xpmem fields to the end of the struct to fix
this issue.

Signed-off-by: Shi Jin <[email protected]>

prov/shm/src/smr_util.h

@@ -226,9 +226,6 @@ struct smr_region {
 	uint8_t		cma_cap_peer;
 	uint8_t		cma_cap_self;
 	uint32_t	max_sar_buf_per_peer;
-	uint8_t		xpmem_cap_self;
-	struct xpmem_pinfo xpmem_self;
-	struct xpmem_pinfo xpmem_peer;
 	void		*base_addr;
 	pthread_spinlock_t	lock; /* lock for shm access
 				 if both ep->tx_lock and this lock need to
@@ -247,6 +244,10 @@ struct smr_region {
 	size_t		peer_data_offset;
 	size_t		name_offset;
 	size_t		sock_name_offset;
+
+	uint8_t		xpmem_cap_self;
+	struct xpmem_pinfo xpmem_self;
+	struct xpmem_pinfo xpmem_peer;
 };
 
 struct smr_resp {