[PATCH v3 08/14] bfq: introduce prio_expire flag for bfq_queue

[brookxu]

From: Chunguang Xu <broo...@tencent.com>

When in_service_queue needs to be preempted by task with
a higher priority, we will mark it with prio_expire flag,
and then expire it on the IO dispatch path. Here add
prio_expire flag only.

Signed-off-by: Chunguang Xu <broo...@tencent.com>
---
 block/bfq-iosched.c | 2 ++
 block/bfq-iosched.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index e7bc5e2..6e19b5a 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -153,6 +153,7 @@
 BFQ_BFQQ_FNS(wait_request);
 BFQ_BFQQ_FNS(non_blocking_wait_rq);
 BFQ_BFQQ_FNS(fifo_expire);
+BFQ_BFQQ_FNS(prio_expire);
 BFQ_BFQQ_FNS(has_short_ttime);
 BFQ_BFQQ_FNS(sync);
 BFQ_BFQQ_FNS(IO_bound);
@@ -2986,6 +2987,7 @@ static void __bfq_set_in_service_queue(struct bfq_data 
*bfqd,
 {
        if (bfqq) {
                bfq_clear_bfqq_fifo_expire(bfqq);
+               bfq_clear_bfqq_prio_expire(bfqq);
 
                bfqd->budgets_assigned = (bfqd->budgets_assigned * 7 + 256) / 8;
 
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 674de8b..8af5ac0 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -777,6 +777,7 @@ enum bfqq_state_flags {
                                     * without idling the device
                                     */
        BFQQF_fifo_expire,      /* FIFO checked in this slice */
+       BFQQF_prio_expire,      /* should expire for higher prio queue*/
        BFQQF_has_short_ttime,  /* queue has a short think time */
        BFQQF_sync,             /* synchronous queue */
        BFQQF_IO_bound,         /*
@@ -806,6 +807,7 @@ enum bfqq_state_flags {
 BFQ_BFQQ_FNS(wait_request);
 BFQ_BFQQ_FNS(non_blocking_wait_rq);
 BFQ_BFQQ_FNS(fifo_expire);
+BFQ_BFQQ_FNS(prio_expire);
 BFQ_BFQQ_FNS(has_short_ttime);
 BFQ_BFQQ_FNS(sync);
 BFQ_BFQQ_FNS(IO_bound);
-- 
1.8.3.1