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| author | Ed Tsai <ed.tsai@mediatek.com> | 2023-06-14 08:25:29 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-06-14 11:11:25 -0600 |
| commit | 30654614f3d27230200b1650f6025a2ce67900b4 (patch) | |
| tree | 9f8284d7566cacc1e4428be18e6a29276cc1b794 /block | |
| parent | 6070131176af5375ae9fa24efebda41c878f4ec2 (diff) | |
| download | linux-30654614f3d27230200b1650f6025a2ce67900b4.tar.gz linux-30654614f3d27230200b1650f6025a2ce67900b4.tar.bz2 linux-30654614f3d27230200b1650f6025a2ce67900b4.zip | |
blk-mq: check on cpu id when there is only one ctx mapping
commit f168420c62e7 ("blk-mq: don't redirect completion for hctx withs
only one ctx mapping") When nvme applies a 1:1 mapping of hctx and ctx,
there will be no remote request.
But for ufs, the submission and completion queues could be asymmetric.
(e.g. Multiple SQs share one CQ) Therefore, 1:1 mapping of hctx and
ctx won't complete request on the submission cpu. In this situation,
this nr_ctx check could violate the QUEUE_FLAG_SAME_FORCE, as a result,
check on cpu id when there is only one ctx mapping.
Signed-off-by: Ed Tsai <ed.tsai@mediatek.com>
Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
Suggested-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230614002529.6636-1-ed.tsai@mediatek.com
[axboe: fixed up indentation]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 1749f5890606..24dc8fe0a9d2 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1185,8 +1185,9 @@ bool blk_mq_complete_request_remote(struct request *rq) * or a polled request, always complete locally, * it's pointless to redirect the completion. */ - if (rq->mq_hctx->nr_ctx == 1 || - rq->cmd_flags & REQ_POLLED) + if ((rq->mq_hctx->nr_ctx == 1 && + rq->mq_ctx->cpu == raw_smp_processor_id()) || + rq->cmd_flags & REQ_POLLED) return false; if (blk_mq_complete_need_ipi(rq)) { |