AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

blk-mq: clear hctx->dispatch_from when mappings change

Browse Source 
When the number of hardware queues is changed, the drivers will call
blk_mq_update_nr_hw_queues() to remap hardware queues. This changes
the ctx mappings, but the current code doesn't clear the
->dispatch_from hint. This can result in dispatch_from pointing to
a ctx that isn't mapped to the hctx anymore.

Fixes: b347689ffb ("blk-mq-sched: improve dispatching from sw queue")
Signed-off-by: huhai <huhai@kylinos.cn>
Reviewed-by: Ming Lei <ming.lei@redhat.com>

Moved the placement of the clearing to where we clear other items
pertaining to the existing mapping, added Fixes line, and reworded
the commit message.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
huhai 2018-05-18 08:32:30 -06:00 committed by Jens Axboe
parent 76aa1d3412
commit d416c92c5d
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
block/blk-mq.c
View File

@ -2358,6 +2358,7 @@ static void blk_mq_map_swqueue(struct request_queue *q)
queue_for_each_hw_ctx(q, hctx, i) {
cpumask_clear(hctx->cpumask);
hctx->nr_ctx = 0;
hctx->dispatch_from = NULL;
}
/*