diff options
| author | David Sterba <dsterba@suse.com> | 2017-03-02 20:54:52 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 15:07:25 +0300 |
| commit | cc8385b59e17d489814d54d6a846aba7051fdea5 (patch) | |
| tree | 5fec399f1ead33f3e52de975c185eaf788ad2978 /fs | |
| parent | 261cc2cca0a8c1d817be65434052feb1db1fd961 (diff) | |
| download | linux-cc8385b59e17d489814d54d6a846aba7051fdea5.tar.xz | |
btrfs: preallocate radix tree node for readahead
We can preallocate the node so insertion does not have to do that under
the lock. The GFP flags for the per-device radix tree are initialized to
GFP_NOFS & ~__GFP_DIRECT_RECLAIM
but we can use GFP_KERNEL, same as an allocation above anyway, but also
because readahead is optional and not on any critical writeout path.
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/reada.c | 7 | ||||
| -rw-r--r-- | fs/btrfs/volumes.c | 2 |
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c index e88bca87f5d2..fdae8ca79401 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -270,6 +270,12 @@ static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info, if (!zone) return NULL; + ret = radix_tree_preload(GFP_KERNEL); + if (ret) { + kfree(zone); + return NULL; + } + zone->start = start; zone->end = end; INIT_LIST_HEAD(&zone->list); @@ -299,6 +305,7 @@ static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info, zone = NULL; } spin_unlock(&fs_info->reada_lock); + radix_tree_preload_end(); return zone; } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 13574f37dc36..df50a63bbc3f 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -252,7 +252,7 @@ static struct btrfs_device *__alloc_device(void) atomic_set(&dev->reada_in_flight, 0); atomic_set(&dev->dev_stats_ccnt, 0); btrfs_device_data_ordered_init(dev); - INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); + INIT_RADIX_TREE(&dev->reada_zones, GFP_KERNEL); INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); return dev; |