Currently, we check whether the hctx type is supported every time
in hot path. Actually, this is not necessary, we could save the
default hctx into ctx->hctxs if the type is not supported when
map swqueues and use it directly with ctx->hctxs[type].
We also needn't check whether the poll is enabled or not, because
the caller would clear the REQ_HIPRI in that case.
Signed-off-by: Jianchao Wang <jianchao.w.wang@xxxxxxxxxx>
---
block/blk-mq.c | 9 ++++++++-
block/blk-mq.h | 13 +++++--------
2 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 445d0a2..8a825ae 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2431,8 +2431,11 @@ static void blk_mq_map_swqueue(struct request_queue *q)
ctx = per_cpu_ptr(q->queue_ctx, i);
for (j = 0; j < set->nr_maps; j++) {
- if (!set->map[j].nr_queues)
+ if (!set->map[j].nr_queues) {
+ ctx->hctxs[j] = blk_mq_map_queue_type(q,
+ HCTX_TYPE_DEFAULT, i);
continue;
+ }
hctx = blk_mq_map_queue_type(q, j, i);
ctx->hctxs[j] = hctx;
@@ -2455,6 +2458,10 @@ static void blk_mq_map_swqueue(struct request_queue *q)
*/
BUG_ON(!hctx->nr_ctx);
}
+
+ for (; j < HCTX_MAX_TYPES; j++)
+ ctx->hctxs[j] = blk_mq_map_queue_type(q,
+ HCTX_TYPE_DEFAULT, i);
}
mutex_unlock(&q->sysfs_lock);
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 9fb0626..14b7efb9 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -106,15 +106,12 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
{
enum hctx_type type = HCTX_TYPE_DEFAULT;
- if ((flags & REQ_HIPRI) &&
- q->tag_set->nr_maps > HCTX_TYPE_POLL &&
- q->tag_set->map[HCTX_TYPE_POLL].nr_queues &&
- test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
+ /*
+ * The caller ensure that if REQ_HIPRI, poll must be enabled.
+ */
+ if (flags & REQ_HIPRI)
type = HCTX_TYPE_POLL;
-
- else if (((flags & REQ_OP_MASK) == REQ_OP_READ) &&
- q->tag_set->nr_maps > HCTX_TYPE_READ &&
- q->tag_set->map[HCTX_TYPE_READ].nr_queues)
+ else if ((flags & REQ_OP_MASK) == REQ_OP_READ)
type = HCTX_TYPE_READ;
return ctx->hctxs[type];
--
2.7.4
