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/discard.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/discard.h')
| -rw-r--r-- | fs/btrfs/discard.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/discard.h b/fs/btrfs/discard.h index f9445ee5dcc3..21a15776dac4 100644 --- a/fs/btrfs/discard.h +++ b/fs/btrfs/discard.h @@ -11,6 +11,11 @@ struct btrfs_block_group; /* Discard size limits */ #define BTRFS_ASYNC_DISCARD_DEFAULT_MAX_SIZE (SZ_64M) +#define BTRFS_ASYNC_DISCARD_MAX_FILTER (SZ_1M) +#define BTRFS_ASYNC_DISCARD_MIN_FILTER (SZ_32K) + +/* List operations */ +void btrfs_discard_check_filter(struct btrfs_block_group *block_group, u64 bytes); /* Work operations */ void btrfs_discard_cancel_work(struct btrfs_discard_ctl *discard_ctl, |