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| author | Mikulas Patocka <mpatocka@redhat.com> | 2011-07-23 20:44:24 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-07-23 20:44:24 +0200 |
| commit | ef3230880abd36553ab442363d3c9a0661f00769 (patch) | |
| tree | d314461b25b76f62d27d7356dcc7fb8157982e61 | |
| parent | 4c64500eada358165d0bb9a20d6c7d30821995b4 (diff) | |
| download | linux-0-day-ef3230880abd36553ab442363d3c9a0661f00769.tar.gz linux-0-day-ef3230880abd36553ab442363d3c9a0661f00769.tar.xz | |
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.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index f032e6e1e09af..2ef0dc9e7f39e 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, |