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authorMikulas Patocka <mpatocka@redhat.com>2011-07-23 20:44:24 +0200
committerJens Axboe <jaxboe@fusionio.com>2011-07-23 20:44:24 +0200
commitef3230880abd36553ab442363d3c9a0661f00769 (patch)
treed314461b25b76f62d27d7356dcc7fb8157982e61
parent4c64500eada358165d0bb9a20d6c7d30821995b4 (diff)
downloadlinux-ef3230880abd36553ab442363d3c9a0661f00769.tar.gz
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: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
-rw-r--r--mm/backing-dev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f032e6e1e09..2ef0dc9e7f3 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -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,