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https://github.com/torvalds/linux
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80c3308578
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 <kent.overstreet@linux.dev>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_LRU_H
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#define _BCACHEFS_LRU_H
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#define LRU_TIME_BITS 48
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#define LRU_TIME_MAX ((1ULL << LRU_TIME_BITS) - 1)
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static inline struct bpos lru_pos(u16 lru_id, u64 dev_bucket, u64 time)
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{
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EBUG_ON(time > LRU_TIME_MAX);
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return POS(((u64) lru_id << LRU_TIME_BITS)|time, dev_bucket);
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}
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static inline u64 lru_pos_id(struct bpos pos)
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{
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return pos.inode >> LRU_TIME_BITS;
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}
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static inline u64 lru_pos_time(struct bpos pos)
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{
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return pos.inode & ~(~0ULL << LRU_TIME_BITS);
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}
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#define BCH_LRU_TYPES() \
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x(read) \
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x(fragmentation)
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enum bch_lru_type {
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#define x(n) BCH_LRU_##n,
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BCH_LRU_TYPES()
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#undef x
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};
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#define BCH_LRU_FRAGMENTATION_START ((1U << 16) - 1)
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static inline enum bch_lru_type lru_type(struct bkey_s_c l)
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{
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u16 lru_id = l.k->p.inode >> 48;
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if (lru_id == BCH_LRU_FRAGMENTATION_START)
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return BCH_LRU_fragmentation;
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return BCH_LRU_read;
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}
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int bch2_lru_invalid(const struct bch_fs *, struct bkey_s_c, unsigned, struct printbuf *);
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void bch2_lru_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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void bch2_lru_pos_to_text(struct printbuf *, struct bpos);
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#define bch2_bkey_ops_lru ((struct bkey_ops) { \
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.key_invalid = bch2_lru_invalid, \
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.val_to_text = bch2_lru_to_text, \
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})
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int bch2_lru_del(struct btree_trans *, u16, u64, u64);
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int bch2_lru_set(struct btree_trans *, u16, u64, u64);
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int bch2_lru_change(struct btree_trans *, u16, u64, u64, u64);
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int bch2_check_lrus(struct bch_fs *);
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#endif /* _BCACHEFS_LRU_H */
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