diff options
| author | Dennis Zhou <dennis@kernel.org> | 2020-01-02 16:26:39 -0500 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-01-20 16:41:00 +0100 |
| commit | 7fe6d45e4009d9502fef32ac6222862ac17f8674 (patch) | |
| tree | 870db67c211f8be19b54e97ae253f6600c846af5 /fs/btrfs/ctree.h | |
| parent | 19b2a2c71979f849cadc33af3577f739cc95e1f0 (diff) | |
btrfs: have multiple discard lists
Non-block group destruction discarding currently only had a single list
with no minimum discard length. This can lead to caravaning more
meaningful discards behind a heavily fragmented block group.
This adds support for multiple lists with minimum discard lengths to
prevent the caravan effect. We promote block groups back up when we
exceed the BTRFS_ASYNC_DISCARD_MAX_FILTER size, currently we support
only 2 lists with filters of 1MB and 32KB respectively.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index fa6c95fdf5c6..486b9d1532eb 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -456,7 +456,7 @@ struct btrfs_full_stripe_locks_tree { * afterwards represent monotonically decreasing discard filter sizes to * prioritize what should be discarded next. */ -#define BTRFS_NR_DISCARD_LISTS 2 +#define BTRFS_NR_DISCARD_LISTS 3 #define BTRFS_DISCARD_INDEX_UNUSED 0 #define BTRFS_DISCARD_INDEX_START 1 |