From 80c33085783656617d0d07e1bc9fba70a592ce5c Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Mon, 5 Dec 2022 10:24:19 -0500 Subject: bcachefs: Fragmentation LRU Now that we have much more efficient updates to the LRU btree, this patch adds a new LRU that indexes buckets by fragmentation. This means copygc no longer has to scan every bucket to find buckets that need to be evacuated. Changes: - A new field in bch_alloc_v4, fragmentation_lru - this corresponds to the bucket's position in the fragmentation LRU. We add a new field for this instead of calculating it as needed because we may make the fragmentation LRU optional; this field indicates whether a bucket is on the fragmentation LRU. Also, zoned devices will introduce variable bucket sizes; explicitly recording the LRU position will be safer for them. - A new copygc path for using the fragmentation LRU instead of scanning every bucket and building up an in-memory heap. Signed-off-by: Kent Overstreet --- fs/bcachefs/move.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/bcachefs/move.h') diff --git a/fs/bcachefs/move.h b/fs/bcachefs/move.h index aef613802935..c5a7c0add1d6 100644 --- a/fs/bcachefs/move.h +++ b/fs/bcachefs/move.h @@ -66,7 +66,8 @@ int bch2_move_data(struct bch_fs *, bool, move_pred_fn, void *); -int __bch2_evacuate_bucket(struct moving_context *, +int __bch2_evacuate_bucket(struct btree_trans *, + struct moving_context *, struct bpos, int, struct data_update_opts); int bch2_evacuate_bucket(struct bch_fs *, struct bpos, int, -- cgit