diff options
| author | Chengming Zhou <zhouchengming@bytedance.com> | 2023-08-21 17:56:02 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-08-22 08:58:06 -0600 |
| commit | 7222657e51b5626d10154b3e48ad441c33b5da96 (patch) | |
| tree | 1cd2f2e35cb1154c3d2a460fe49d73c518c5e555 /block/blk-mq.c | |
| parent | 2bc4d7a355a4d617452eaf1b21d6d261194b3667 (diff) | |
blk-mq: prealloc tags when increase tagset nr_hw_queues
Just like blk_mq_alloc_tag_set(), it's better to prepare all tags before
using to map to queue ctxs in blk_mq_map_swqueue(), which now have to
consider empty set->tags[].
The good point is that we can fallback easily if increasing nr_hw_queues
fail, instead of just mapping to hctx[0] when fail in blk_mq_map_swqueue().
And the fallback path already has tags free & clean handling, so all
is good.
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230821095602.70742-3-chengming.zhou@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 22397ba815ca..84400157c5f4 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -4397,6 +4397,16 @@ static int blk_mq_realloc_tag_set_tags(struct blk_mq_tag_set *set, sizeof(*set->tags)); kfree(set->tags); set->tags = new_tags; + + for (i = set->nr_hw_queues; i < new_nr_hw_queues; i++) { + if (!__blk_mq_alloc_map_and_rqs(set, i)) { + while (--i >= set->nr_hw_queues) + __blk_mq_free_map_and_rqs(set, i); + return -ENOMEM; + } + cond_resched(); + } + done: set->nr_hw_queues = new_nr_hw_queues; return 0; |