Re: [PATCH] backing dev unplugging

[Andrew Morton]

Jens Axboe <axboe@xxxxxxx> wrote:
>
> Here's a first cut at killing global plugging of block devices to reduce
> the nasty contention blk_plug_lock caused.

Shouldn't we take read_lock(&md->map_lock) in dm_table_unplug_all()?

If so, what are the lock ranking issues here?  The queue lock is not held
yet, so it seems pretty simple?
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