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authorJens Axboe <axboe@kernel.dk>2018-10-29 15:06:13 -0600
committerJens Axboe <axboe@kernel.dk>2018-11-07 13:44:59 -0700
commitea4f995ee8b8f0578b3319949f2edd5d812fdb0a (patch)
treef7516777fbd8b2fc16cf75b846792981c3a07434 /block/blk-mq-debugfs.c
parent392546aed22009060911f76b6ea24520e2f8b50f (diff)
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blk-mq: cache request hardware queue mapping
We call blk_mq_map_queue() a lot, at least two times for each request per IO, sometimes more. Since we now have an indirect call as well in that function. cache the mapping so we don't have to re-call blk_mq_map_queue() for the same request multiple times. Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-debugfs.c')
-rw-r--r--block/blk-mq-debugfs.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index fac70c81b7de..cde19be36135 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -427,10 +427,8 @@ struct show_busy_params {
static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
{
const struct show_busy_params *params = data;
- struct blk_mq_hw_ctx *hctx;
- hctx = blk_mq_map_queue(rq->q, rq->cmd_flags, rq->mq_ctx->cpu);
- if (hctx == params->hctx)
+ if (rq->mq_hctx == params->hctx)
__blk_mq_debugfs_rq_show(params->m,
list_entry_rq(&rq->queuelist));
}