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Code Issues Releases Wiki Activity

blk-mq: move more logic into blk_mq_insert_requests 

Move all logic related to the direct insert (including the call to
blk_mq_run_hw_queue) into blk_mq_insert_requests to streamline the code
flow up a bit, and to allow marking blk_mq_try_issue_list_directly
static.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230413064057.707578-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-04-13 08:40:41 +02:00 committed by Jens Axboe
parent 90110e04f2
commit 94aa228c2a
3 changed files with 21 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
block/blk-mq-sched.c
View File

@ -472,23 +472,10 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
e = hctx->queue->elevator;
if (e) {
e->type->ops.insert_requests(hctx, list, false);
blk_mq_run_hw_queue(hctx, run_queue_async);
} else {
/*
* try to issue requests directly if the hw queue isn't
* busy in case of 'none' scheduler, and this way may save
* us one extra enqueue & dequeue to sw queue.
*/
if (!hctx->dispatch_busy && !run_queue_async) {
blk_mq_run_dispatch_ops(hctx->queue,
blk_mq_try_issue_list_directly(hctx, list));
if (list_empty(list))
goto out;
}
blk_mq_insert_requests(hctx, ctx, list);
blk_mq_insert_requests(hctx, ctx, list, run_queue_async);
}
blk_mq_run_hw_queue(hctx, run_queue_async);
out:
percpu_ref_put(&q->q_usage_counter);
}

20
block/blk-mq.c
View File

@ -44,6 +44,9 @@
static DEFINE_PER_CPU(struct llist_head, blk_cpu_done);
static void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
struct list_head *list);
static inline struct blk_mq_hw_ctx *blk_qc_to_hctx(struct request_queue *q,
blk_qc_t qc)
{
@ -2495,12 +2498,23 @@ void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
}
void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
struct list_head *list)
struct list_head *list, bool run_queue_async)
{
struct request *rq;
enum hctx_type type = hctx->type;
/*
* Try to issue requests directly if the hw queue isn't busy to save an
* extra enqueue & dequeue to the sw queue.
*/
if (!hctx->dispatch_busy && !run_queue_async) {
blk_mq_run_dispatch_ops(hctx->queue,
blk_mq_try_issue_list_directly(hctx, list));
if (list_empty(list))
goto out;
}
/*
* preemption doesn't flush plug list, so it's possible ctx->cpu is
* offline now
@ -2514,6 +2528,8 @@ void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
list_splice_tail_init(list, &ctx->rq_lists[type]);
blk_mq_hctx_mark_pending(hctx, ctx);
spin_unlock(&ctx->lock);
out:
blk_mq_run_hw_queue(hctx, run_queue_async);
}
static void blk_mq_bio_to_request(struct request *rq, struct bio *bio,
@ -2755,7 +2771,7 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
} while (!rq_list_empty(plug->mq_list));
}
void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
static void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
struct list_head *list)
{
int queued = 0;

4
block/blk-mq.h
View File

@ -70,9 +70,7 @@ void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
bool run_queue);
void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
struct list_head *list);
void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
struct list_head *list);
struct list_head *list, bool run_queue_async);
/*
* CPU -> queue mappings