projects
/
linux-block.git
/ commitdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
| commitdiff |
tree
raw
|
patch
| inline |
side by side
(parent:
81c7a63
)
blk-mq: don't redirect completion for hctx withs only one ctx mapping
author
Liu Song
<liusong@linux.alibaba.com>
Wed, 21 Sep 2022 03:32:03 +0000
(11:32 +0800)
committer
Jens Axboe
<axboe@kernel.dk>
Sat, 24 Sep 2022 15:02:30 +0000
(09:02 -0600)
High-performance NVMe devices usually support a large hw queues, which
ensures a 1:1 mapping of hctx and ctx. In this case there will be no
remote request, so we don't need to care about it.
Signed-off-by: Liu Song <liusong@linux.alibaba.com>
Link:
https://lore.kernel.org/r/1663731123-81536-1-git-send-email-liusong@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/blk-mq.c
patch
|
blob
|
blame
|
history
diff --git
a/block/blk-mq.c
b/block/blk-mq.c
index 29bb48de5bda7b68ea4371770516c4e7565de142..496085132899250cc8f8b6bc536f7ab9cf017cf4 100644
(file)
--- a/
block/blk-mq.c
+++ b/
block/blk-mq.c
@@
-1093,10
+1093,12
@@
bool blk_mq_complete_request_remote(struct request *rq)
WRITE_ONCE(rq->state, MQ_RQ_COMPLETE);
/*
- * For a polled request, always complete locally, it's pointless
- * to redirect the completion.
+ * For request which hctx has only one ctx mapping,
+ * or a polled request, always complete locally,
+ * it's pointless to redirect the completion.
*/
- if (rq->cmd_flags & REQ_POLLED)
+ if (rq->mq_hctx->nr_ctx == 1 ||
+ rq->cmd_flags & REQ_POLLED)
return false;
if (blk_mq_complete_need_ipi(rq)) {