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authorDavid Sterba <dsterba@suse.com>2017-03-02 20:54:52 +0300
committerDavid Sterba <dsterba@suse.com>2017-04-18 15:07:25 +0300
commitcc8385b59e17d489814d54d6a846aba7051fdea5 (patch)
tree5fec399f1ead33f3e52de975c185eaf788ad2978 /fs/btrfs/reada.c
parent261cc2cca0a8c1d817be65434052feb1db1fd961 (diff)
downloadlinux-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/btrfs/reada.c')
-rw-r--r--fs/btrfs/reada.c7
1 files changed, 7 insertions, 0 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;
}