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backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu

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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: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Mikulas Patocka 2011-07-23 20:44:24 +02:00 committed by Jens Axboe
parent 4c64500ead
commit ef3230880a
1 changed files with 1 additions and 1 deletions
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mm/backing-dev.c
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@ -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,