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| author |   David Sterba <dsterba@suse.com> | 2017-03-02 18:54:52 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 14:07:25 +0200 |
| commit | 7ef70b4d9987a78d39c4e40a02093493333e5408 (patch) | |
| tree | 95d61665823af9253ba7fa6a00a84754ab820c93 /fs/btrfs/reada.c | |
| parent | btrfs: preallocate radix tree node for readahead (diff) | |
| download | linux-dev-7ef70b4d9987a78d39c4e40a02093493333e5408.tar.xz linux-dev-7ef70b4d9987a78d39c4e40a02093493333e5408.zip | |
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/reada.c')
| -rw-r--r-- | fs/btrfs/reada.c | 7 |
1 files changed, 7 insertions, 0 deletions
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); |