[PATCH rfc 10/10] target: Use non-selective polling

[Sagi Grimberg <sagi@grimberg.me>]

It doesn't really make sense to do selective polling
because we never care about specific IOs. Non selective
polling can actually help by doing some useful work
while we're submitting a command.

We ask for a batch of (magic) 4 completions which looks
like a decent network<->backend proportion, if less are
available we'll see less.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/target/target_core_iblock.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index d316ed537d59..00726b6e51c4 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -757,6 +757,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 	}
 
 	iblock_submit_bios(&list);
+	blk_mq_poll_batch(bdev_get_queue(IBLOCK_DEV(dev)->ibd_bd), 4);
 	iblock_complete_cmd(cmd);
 	return 0;
 
-- 
2.7.4