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blk-mq: move the kdump check to blk_mq_alloc_tag_set 

We call blk_mq_alloc_tag_set() first then blk_mq_init_queue(). The requests are
allocated in the former function. So the kdump check should be moved to there
to really save memory.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaohua Li 2014-11-30 16:00:58 -08:00 committed by Jens Axboe
parent 70114c393c
commit 6637fadf25
1 changed files with 10 additions and 10 deletions
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20
block/blk-mq.c
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@ -1804,16 +1804,6 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
if (!ctx)
return ERR_PTR(-ENOMEM);
/*
* If a crashdump is active, then we are potentially in a very
* memory constrained environment. Limit us to 1 queue and
* 64 tags to prevent using too much memory.
*/
if (is_kdump_kernel()) {
set->nr_hw_queues = 1;
set->queue_depth = min(64U, set->queue_depth);
}
hctxs = kmalloc_node(set->nr_hw_queues * sizeof(*hctxs), GFP_KERNEL,
set->numa_node);
@ -2070,6 +2060,16 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set)
set->queue_depth = BLK_MQ_MAX_DEPTH;
}
/*
* If a crashdump is active, then we are potentially in a very
* memory constrained environment. Limit us to 1 queue and
* 64 tags to prevent using too much memory.
*/
if (is_kdump_kernel()) {
set->nr_hw_queues = 1;
set->queue_depth = min(64U, set->queue_depth);
}
set->tags = kmalloc_node(set->nr_hw_queues *
sizeof(struct blk_mq_tags *),
GFP_KERNEL, set->numa_node);