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dm: do not allocate any mempools for blk-mq request-based DM

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Do not allocate the io_pool mempool for blk-mq request-based DM
(DM_TYPE_MQ_REQUEST_BASED) in dm_alloc_rq_mempools().

Also refine __bind_mempools() to have more precise awareness of which
mempools each type of DM device uses -- avoids mempool churn when
reloading DM tables (particularly for DM_TYPE_REQUEST_BASED).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
2015-04-27 16:37:50 -04:00
parent 183f7802e7
commit cbc4e3c135
2 changed files with 40 additions and 33 deletions
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4
drivers/md/dm-table.c
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@@ -964,8 +964,8 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
return -EINVAL;
}
if (!t->mempools)
return -ENOMEM;
if (IS_ERR(t->mempools))
return PTR_ERR(t->mempools);
return 0;
}