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authorMing Lei <ming.lei@redhat.com>2018-07-02 17:35:58 +0800
committerJens Axboe <axboe@kernel.dk>2018-07-09 09:07:53 -0600
commit3f0cedc7e9a0b32e79c79d2aac0c96d2b870ae55 (patch)
treed89b81817e3e11e00965ca756a404cb7f2c57baf /block
parentc018c84fdb453ae057f3bcc87a1f1f730d41628b (diff)
downloadlinux-3f0cedc7e9a0b32e79c79d2aac0c96d2b870ae55.tar.bz2
blk-mq: use list_splice_tail_init() to insert requests
list_splice_tail_init() is much more faster than inserting each request one by one, given all requets in 'list' belong to same sw queue and ctx->lock is required to insert requests. Cc: Laurence Oberman <loberman@redhat.com> Cc: Omar Sandoval <osandov@fb.com> Cc: Bart Van Assche <bart.vanassche@wdc.com> Tested-by: Kashyap Desai <kashyap.desai@broadcom.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index acf31ad733bf..795ba859b16b 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1545,19 +1545,19 @@ void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
struct list_head *list)
{
+ struct request *rq;
+
/*
* preemption doesn't flush plug list, so it's possible ctx->cpu is
* offline now
*/
- spin_lock(&ctx->lock);
- while (!list_empty(list)) {
- struct request *rq;
-
- rq = list_first_entry(list, struct request, queuelist);
+ list_for_each_entry(rq, list, queuelist) {
BUG_ON(rq->mq_ctx != ctx);
- list_del_init(&rq->queuelist);
- __blk_mq_insert_req_list(hctx, rq, false);
+ trace_block_rq_insert(hctx->queue, rq);
}
+
+ spin_lock(&ctx->lock);
+ list_splice_tail_init(list, &ctx->rq_list);
blk_mq_hctx_mark_pending(hctx, ctx);
spin_unlock(&ctx->lock);
}