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Commit ef323088 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Jens Axboe
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backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu 



backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu

synchronize_rcu sleeps several timer ticks. synchronize_rcu_expedited is
much faster.

With 100Hz timer frequency, when we remove 10000 block devices with
"dmsetup remove_all" command, it takes 27 minutes. With this patch,
removing 10000 block devices takes only 15 seconds.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 4c64500e

mm/backing-dev.c

+1 −1
Original line number Diff line number Diff line
@@ -505,7 +505,7 @@ static void bdi_remove_from_list(struct backing_dev_info *bdi) 
	list_del_rcu(&bdi->bdi_list);

	spin_unlock_bh(&bdi_lock);



	synchronize_rcu();

	synchronize_rcu_expedited();

}



int bdi_register(struct backing_dev_info *bdi, struct device *parent,