From: Ilan Smith <ilan.smith@xxxxxxxxxxx>
When exp_swapin and exp_dmpg are set, treat read requests
marked with DMPG and SWAPIN as high priority and move to
the front of the queue.
Signed-off-by: Ilan Smith <ilan.smith@xxxxxxxxxxx>
Signed-off-by: Alex Lemberg <alex.lemberg@xxxxxxxxxxx>
Signed-off-by: Venkatraman S <svenkatr@xxxxxx>
---
block/blk-core.c | 18 ++++++++++++++++++
block/elevator.c | 14 +++++++++++++-
2 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 1f61b74..7a1b98b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1306,6 +1306,12 @@ void init_request_from_bio(struct request *req, struct bio *bio)
if (bio->bi_rw & REQ_RAHEAD)
req->cmd_flags |= REQ_FAILFAST_MASK;
+ if (bio_swapin(bio) && blk_queue_exp_swapin(req->q))
+ req->cmd_flags |= REQ_RW_SWAPIN | REQ_NOMERGE;
+
+ if (bio_dmpg(bio) && blk_queue_exp_dmpg(req->q))
+ req->cmd_flags |= REQ_RW_DMPG | REQ_NOMERGE;
+
req->errors = 0;
req->__sector = bio->bi_sector;
req->ioprio = bio_prio(bio);
@@ -1333,6 +1339,18 @@ void blk_queue_bio(struct request_queue *q, struct bio *bio)
goto get_rq;
}
+ if (bio_swapin(bio) && blk_queue_exp_swapin(q)) {
+ spin_lock_irq(q->queue_lock);
+ where = ELEVATOR_INSERT_FLUSH;
+ goto get_rq;
+ }
+
+ if (bio_dmpg(bio) && blk_queue_exp_dmpg(q)) {
+ spin_lock_irq(q->queue_lock);
+ where = ELEVATOR_INSERT_FLUSH;
+ goto get_rq;
+ }
+
/*
* Check if we can merge with the plugged list before grabbing
* any locks.
diff --git a/block/elevator.c b/block/elevator.c
index f016855..76d571b 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -367,7 +367,8 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
q->nr_sorted--;
boundary = q->end_sector;
- stop_flags = REQ_SOFTBARRIER | REQ_STARTED;
+ stop_flags = REQ_SOFTBARRIER | REQ_STARTED
+ | REQ_RW_SWAPIN | REQ_RW_DMPG ;
list_for_each_prev(entry, &q->queue_head) {
struct request *pos = list_entry_rq(entry);
@@ -585,6 +586,17 @@ void elv_quiesce_end(struct request_queue *q)
void __elv_add_request(struct request_queue *q, struct request *rq, int where)
{
+ unsigned int hpi_flags = REQ_RW_DMPG | REQ_RW_SWAPIN;
+
+ if (rq->cmd_flags & hpi_flags) {
+ /*
+ * Insert swap-in or demand page requests at the front. This
+ * causes them to be queued in the reversed order.
+ */
+ where = ELEVATOR_INSERT_FRONT;
+ } else
+
+
trace_block_rq_insert(q, rq);
rq->q = q;
--
1.7.10.rc2
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