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authorJianchao Wang <jianchao.w.wang@oracle.com>2019-01-24 18:25:32 +0800
committerJens Axboe <axboe@kernel.dk>2019-02-01 08:33:04 -0700
commit8ccdf4a3775229314c8bd365ac88c2cbdf36be13 (patch)
tree8b6c6835912bb3f3076d6694ba264072ae5921b6 /block/blk-mq.h
parent058fdecc6de7cdecbf4c59b851e80eb2d6c5295f (diff)
downloadlinux-8ccdf4a3775229314c8bd365ac88c2cbdf36be13.tar.bz2
blk-mq: save queue mapping result into ctx directly
Currently, the queue mapping result is saved in a two-dimensional array. In the hot path, to get a hctx, we need do following: q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]] This isn't very efficient. We could save the queue mapping result into ctx directly with different hctx type, like, ctx->hctxs[type] Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r--block/blk-mq.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h
index d943d46b0785..9fb06261518e 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -23,6 +23,7 @@ struct blk_mq_ctx {
unsigned int cpu;
unsigned short index_hw[HCTX_MAX_TYPES];
+ struct blk_mq_hw_ctx *hctxs[HCTX_MAX_TYPES];
/* incremented at dispatch time */
unsigned long rq_dispatched[2];
@@ -97,11 +98,11 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *
* blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
* @q: request queue
* @flags: request command flags
- * @cpu: CPU
+ * @cpu: cpu ctx
*/
static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
unsigned int flags,
- unsigned int cpu)
+ struct blk_mq_ctx *ctx)
{
enum hctx_type type = HCTX_TYPE_DEFAULT;
@@ -116,7 +117,7 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
q->tag_set->map[HCTX_TYPE_READ].nr_queues)
type = HCTX_TYPE_READ;
- return blk_mq_map_queue_type(q, type, cpu);
+ return ctx->hctxs[type];
}
/*