From: Hans Westgaard Ry <hans.westgaard.ry@xxxxxxxxxx>
Try prefetching pages when using On-Demand-Paging MR using
ib_advise_mr.
Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
net/rds/ib_rdma.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index 5a02b313ec50..5268a76e5db7 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -574,6 +574,7 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
(IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC |
IB_ACCESS_ON_DEMAND);
+ struct ib_sge sge = {};
struct ib_mr *ib_mr;
if (!rds_ibdev->odp_capable) {
@@ -601,6 +602,14 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
}
ibmr->u.mr = ib_mr;
ibmr->odp = 1;
+
+ sge.addr = virt_addr;
+ sge.length = length;
+ sge.lkey = ib_mr->lkey;
+
+ ib_advise_mr(rds_ibdev->pd,
+ IB_UVERBS_ADVISE_MR_ADVICE_PREFETCH_WRITE,
+ IB_UVERBS_ADVISE_MR_FLAG_FLUSH, &sge, 1);
return ibmr;
}
--
2.20.1
