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authorDavid Sterba <dsterba@suse.com>2017-03-02 18:54:52 +0100
committerDavid Sterba <dsterba@suse.com>2017-04-18 14:07:25 +0200
commit7ef70b4d9987a78d39c4e40a02093493333e5408 (patch)
tree95d61665823af9253ba7fa6a00a84754ab820c93 /fs/btrfs
parentcc8385b59e17d489814d54d6a846aba7051fdea5 (diff)
downloadlinux-7ef70b4d9987a78d39c4e40a02093493333e5408.tar.bz2
btrfs: preallocate radix tree node for global readahead tree
We can preallocate the node so insertion does not have to do that under the lock. The GFP flags for the global radix tree are initialized to GFP_NOFS & ~__GFP_DIRECT_RECLAIM but we can use GFP_KERNEL, 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')
-rw-r--r--fs/btrfs/disk-io.c2
-rw-r--r--fs/btrfs/reada.c7
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bd415e1dd114..12eba54877c2 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2693,7 +2693,7 @@ int open_ctree(struct super_block *sb,
fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
/* readahead state */
- INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
+ INIT_RADIX_TREE(&fs_info->reada_tree, GFP_KERNEL);
spin_lock_init(&fs_info->reada_lock);
fs_info->thread_pool_size = min_t(unsigned long,
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index fdae8ca79401..a7fa4a5cb296 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -393,6 +393,10 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
goto error;
}
+ ret = radix_tree_preload(GFP_KERNEL);
+ if (ret)
+ goto error;
+
/* insert extent in reada_tree + all per-device trees, all or nothing */
btrfs_dev_replace_lock(&fs_info->dev_replace, 0);
spin_lock(&fs_info->reada_lock);
@@ -402,13 +406,16 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
re_exist->refcnt++;
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
+ radix_tree_preload_end();
goto error;
}
if (ret) {
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
+ radix_tree_preload_end();
goto error;
}
+ radix_tree_preload_end();
prev_dev = NULL;
dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(
&fs_info->dev_replace);