1. call blk_flush_plug when cache hit as the address of the subsequent
bio is no longer contiguous with the previous bio;
2. skip cond_resched when ioprio class is rt;
Signed-off-by: LongPing Wei <weilongping@xxxxxxxx>
---
drivers/md/dm-bufio.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 9c8ed65cd87e..ec8392fbcf5d 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1981,6 +1981,7 @@ static void __dm_bufio_prefetch(struct dm_bufio_client *c,
unsigned short ioprio)
{
struct blk_plug plug;
+ unsigned short ioprio_class = IOPRIO_PRIO_CLASS(ioprio);
LIST_HEAD(write_list);
@@ -1997,6 +1998,7 @@ static void __dm_bufio_prefetch(struct dm_bufio_client *c,
if (b) {
/* already in cache */
cache_put_and_wake(c, b);
+ blk_flush_plug(&plug, false);
continue;
}
@@ -2017,7 +2019,8 @@ static void __dm_bufio_prefetch(struct dm_bufio_client *c,
submit_io(b, REQ_OP_READ, ioprio, read_endio);
dm_bufio_release(b);
- cond_resched();
+ if (ioprio_class != IOPRIO_CLASS_RT)
+ cond_resched();
if (!n_blocks)
goto flush_plug;
--
2.34.1
