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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2021-01-23 23:10:26 +0300
committerJens Axboe <axboe@kernel.dk>2021-02-12 18:28:02 +0300
commit0a2efafbb1c752a7041652445bc1232114409633 (patch)
tree1c974ca682d57393222530d26d0a7094da8725a3 /block
parent93e4f73a93717993bd239e6606689e9ae01c6926 (diff)
downloadlinux-0a2efafbb1c752a7041652445bc1232114409633.tar.xz
blk-mq: Always complete remote completions requests in softirq
Controllers with multiple queues have their IRQ-handelers pinned to a CPU. The core shouldn't need to complete the request on a remote CPU. Remove this case and always raise the softirq to complete the request. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Daniel Wagner <dwagner@suse.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c14
1 files changed, 1 insertions, 13 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index f285a9123a8b..90348ae51846 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -628,19 +628,7 @@ static void __blk_mq_complete_request_remote(void *data)
{
struct request *rq = data;
- /*
- * For most of single queue controllers, there is only one irq vector
- * for handling I/O completion, and the only irq's affinity is set
- * to all possible CPUs. On most of ARCHs, this affinity means the irq
- * is handled on one specific CPU.
- *
- * So complete I/O requests in softirq context in case of single queue
- * devices to avoid degrading I/O performance due to irqsoff latency.
- */
- if (rq->q->nr_hw_queues == 1)
- blk_mq_trigger_softirq(rq);
- else
- rq->q->mq_ops->complete(rq);
+ blk_mq_trigger_softirq(rq);
}
static inline bool blk_mq_complete_need_ipi(struct request *rq)