On Tue, Apr 08 2008, Mike Anderson wrote:
> Performance optimization for high contention of the q->queue_lock under
> certain workloads.
>
> Signed-off-by: Mike Anderson <andmike@xxxxxxxxxxxxxxxxxx>
Acked-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
> ---
>
> drivers/md/dm-table.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index e75b143..f4c8c1b 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -1012,7 +1012,8 @@ void dm_table_unplug_all(struct dm_table *t)
> list_for_each_entry(dd, devices, list) {
> struct request_queue *q = bdev_get_queue(dd->bdev);
>
> - blk_unplug(q);
> + if (blk_queue_plugged(q))
> + blk_unplug(q);
> }
> }
>
>
--
Jens Axboe
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