Drop the heap-related macros from bcache and replacing them with the generic min_heap implementation from include/linux. By doing so, code readability is improved by using functions instead of macros. Moreover, the min_heap implementation in include/linux adopts a bottom-up variation compared to the textbook version currently used in bcache. This bottom-up variation allows for approximately 50% reduction in the number of comparison operations during heap siftdown, without changing the number of swaps, thus making it more efficient.
Link: https://lkml.kernel.org/ioyfizrzq7w7mjrqcadtzsfgpuntowtjdw5pgn4qhvsdp4mqqg@nrlek5vmisbu Signed-off-by: Kuan-Wei Chiu <[email protected]> Reviewed-by: Ian Rogers <[email protected]> Acked-by: Coly Li <[email protected]> --- drivers/md/bcache/alloc.c | 64 +++++++++++++++++++------- drivers/md/bcache/bcache.h | 2 +- drivers/md/bcache/bset.c | 84 ++++++++++++++++++++++++----------- drivers/md/bcache/bset.h | 14 +++--- drivers/md/bcache/btree.c | 17 ++++++- drivers/md/bcache/extents.c | 53 ++++++++++++++-------- drivers/md/bcache/movinggc.c | 41 ++++++++++++----- drivers/md/bcache/sysfs.c | 2 + drivers/md/bcache/util.h | 67 +--------------------------- drivers/md/bcache/writeback.c | 3 ++ 10 files changed, 202 insertions(+), 145 deletions(-) diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c index ce13c272c387..8cfa15ea32b4 100644 --- a/drivers/md/bcache/alloc.c +++ b/drivers/md/bcache/alloc.c @@ -166,40 +166,68 @@ static void bch_invalidate_one_bucket(struct cache *ca, struct bucket *b) * prio is worth 1/8th of what INITIAL_PRIO is worth. */ -#define bucket_prio(b) \ -({ \ - unsigned int min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8; \ - \ - (b->prio - ca->set->min_prio + min_prio) * GC_SECTORS_USED(b); \ -}) +static inline unsigned int new_bucket_prio(struct cache *ca, struct bucket *b) +{ + unsigned int min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8; + + return (b->prio - ca->set->min_prio + min_prio) * GC_SECTORS_USED(b); +} + +static inline bool new_bucket_max_cmp(const void *l, const void *r, void *args) +{ + struct bucket **lhs = (struct bucket **)l; + struct bucket **rhs = (struct bucket **)r; + struct cache *ca = args; + + return new_bucket_prio(ca, *lhs) > new_bucket_prio(ca, *rhs); +} -#define bucket_max_cmp(l, r) (bucket_prio(l) < bucket_prio(r)) -#define bucket_min_cmp(l, r) (bucket_prio(l) > bucket_prio(r)) +static inline bool new_bucket_min_cmp(const void *l, const void *r, void *args) +{ + struct bucket **lhs = (struct bucket **)l; + struct bucket **rhs = (struct bucket **)r; + struct cache *ca = args; + + return new_bucket_prio(ca, *lhs) < new_bucket_prio(ca, *rhs); +} + +static inline void new_bucket_swap(void *l, void *r, void __always_unused *args) +{ + struct bucket **lhs = l, **rhs = r; + + swap(*lhs, *rhs); +} static void invalidate_buckets_lru(struct cache *ca) { struct bucket *b; - ssize_t i; + const struct min_heap_callbacks bucket_max_cmp_callback = { + .less = new_bucket_max_cmp, + .swp = new_bucket_swap, + }; + const struct min_heap_callbacks bucket_min_cmp_callback = { + .less = new_bucket_min_cmp, + .swp = new_bucket_swap, + }; - ca->heap.used = 0; + ca->heap.nr = 0; for_each_bucket(b, ca) { if (!bch_can_invalidate_bucket(ca, b)) continue; - if (!heap_full(&ca->heap)) - heap_add(&ca->heap, b, bucket_max_cmp); - else if (bucket_max_cmp(b, heap_peek(&ca->heap))) { + if (!min_heap_full(&ca->heap)) + min_heap_push(&ca->heap, &b, &bucket_max_cmp_callback, ca); + else if (!new_bucket_max_cmp(&b, min_heap_peek(&ca->heap), ca)) { ca->heap.data[0] = b; - heap_sift(&ca->heap, 0, bucket_max_cmp); + min_heap_sift_down(&ca->heap, 0, &bucket_max_cmp_callback, ca); } } - for (i = ca->heap.used / 2 - 1; i >= 0; --i) - heap_sift(&ca->heap, i, bucket_min_cmp); + min_heapify_all(&ca->heap, &bucket_min_cmp_callback, ca); while (!fifo_full(&ca->free_inc)) { - if (!heap_pop(&ca->heap, b, bucket_min_cmp)) { + if (!ca->heap.nr) { /* * We don't want to be calling invalidate_buckets() * multiple times when it can't do anything @@ -208,6 +236,8 @@ static void invalidate_buckets_lru(struct cache *ca) wake_up_gc(ca->set); return; } + b = min_heap_peek(&ca->heap)[0]; + min_heap_pop(&ca->heap, &bucket_min_cmp_callback, ca); bch_invalidate_one_bucket(ca, b); } diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 4e6afa89921f..575d1e3a5217 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -457,7 +457,7 @@ struct cache { /* Allocation stuff: */ struct bucket *buckets; - DECLARE_HEAP(struct bucket *, heap); + MIN_HEAP(struct bucket *, cache_heap) heap; /* * If nonzero, we know we aren't going to find any buckets to invalidate diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index 2bba4d6aaaa2..bd97d8626887 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -57,6 +57,8 @@ int __bch_count_data(struct btree_keys *b) struct btree_iter iter; struct bkey *k; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + if (b->ops->is_extents) for_each_key(b, k, &iter) ret += KEY_SIZE(k); @@ -70,6 +72,8 @@ void __bch_check_keys(struct btree_keys *b, const char *fmt, ...) struct btree_iter iter; const char *err; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + for_each_key(b, k, &iter) { if (b->ops->is_extents) { err = "Keys out of order"; @@ -110,9 +114,9 @@ void __bch_check_keys(struct btree_keys *b, const char *fmt, ...) static void bch_btree_iter_next_check(struct btree_iter *iter) { - struct bkey *k = iter->data->k, *next = bkey_next(k); + struct bkey *k = iter->heap.data->k, *next = bkey_next(k); - if (next < iter->data->end && + if (next < iter->heap.data->end && bkey_cmp(k, iter->b->ops->is_extents ? &START_KEY(next) : next) > 0) { bch_dump_bucket(iter->b); @@ -885,6 +889,8 @@ unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k, BUG_ON(b->ops->is_extents && !KEY_SIZE(k)); + min_heap_init(&iter.heap, NULL, MAX_BSETS); + /* * If k has preceding key, preceding_key_p will be set to address * of k's preceding key; otherwise preceding_key_p will be set @@ -1077,27 +1083,42 @@ struct bkey *__bch_bset_search(struct btree_keys *b, struct bset_tree *t, /* Btree iterator */ -typedef bool (btree_iter_cmp_fn)(struct btree_iter_set, - struct btree_iter_set); +typedef bool (new_btree_iter_cmp_fn)(const void *, const void *, void *); + +static inline bool new_btree_iter_cmp(const void *l, const void *r, void __always_unused *args) +{ + const struct btree_iter_set *_l = l; + const struct btree_iter_set *_r = r; + + return bkey_cmp(_l->k, _r->k) <= 0; +} -static inline bool btree_iter_cmp(struct btree_iter_set l, - struct btree_iter_set r) +static inline void new_btree_iter_swap(void *iter1, void *iter2, void __always_unused *args) { - return bkey_cmp(l.k, r.k) > 0; + struct btree_iter_set *_iter1 = iter1; + struct btree_iter_set *_iter2 = iter2; + + swap(*_iter1, *_iter2); } static inline bool btree_iter_end(struct btree_iter *iter) { - return !iter->used; + return !iter->heap.nr; } void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k, struct bkey *end) { + const struct min_heap_callbacks callbacks = { + .less = new_btree_iter_cmp, + .swp = new_btree_iter_swap, + }; + if (k != end) - BUG_ON(!heap_add(iter, - ((struct btree_iter_set) { k, end }), - btree_iter_cmp)); + BUG_ON(!min_heap_push(&iter->heap, + &((struct btree_iter_set) { k, end }), + &callbacks, + NULL)); } static struct bkey *__bch_btree_iter_init(struct btree_keys *b, @@ -1107,8 +1128,8 @@ static struct bkey *__bch_btree_iter_init(struct btree_keys *b, { struct bkey *ret = NULL; - iter->size = ARRAY_SIZE(iter->data); - iter->used = 0; + iter->heap.size = ARRAY_SIZE(iter->heap.preallocated); + iter->heap.nr = 0; #ifdef CONFIG_BCACHE_DEBUG iter->b = b; @@ -1130,26 +1151,34 @@ struct bkey *bch_btree_iter_init(struct btree_keys *b, } static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter, - btree_iter_cmp_fn *cmp) + new_btree_iter_cmp_fn *cmp) { struct btree_iter_set b __maybe_unused; struct bkey *ret = NULL; + const struct min_heap_callbacks callbacks = { + .less = cmp, + .swp = new_btree_iter_swap, + }; if (!btree_iter_end(iter)) { bch_btree_iter_next_check(iter); - ret = iter->data->k; - iter->data->k = bkey_next(iter->data->k); + ret = iter->heap.data->k; + iter->heap.data->k = bkey_next(iter->heap.data->k); - if (iter->data->k > iter->data->end) { + if (iter->heap.data->k > iter->heap.data->end) { WARN_ONCE(1, "bset was corrupt!\n"); - iter->data->k = iter->data->end; + iter->heap.data->k = iter->heap.data->end; } - if (iter->data->k == iter->data->end) - heap_pop(iter, b, cmp); + if (iter->heap.data->k == iter->heap.data->end) { + if (iter->heap.nr) { + b = min_heap_peek(&iter->heap)[0]; + min_heap_pop(&iter->heap, &callbacks, NULL); + } + } else - heap_sift(iter, 0, cmp); + min_heap_sift_down(&iter->heap, 0, &callbacks, NULL); } return ret; @@ -1157,7 +1186,7 @@ static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter, struct bkey *bch_btree_iter_next(struct btree_iter *iter) { - return __bch_btree_iter_next(iter, btree_iter_cmp); + return __bch_btree_iter_next(iter, new_btree_iter_cmp); } @@ -1195,16 +1224,18 @@ static void btree_mergesort(struct btree_keys *b, struct bset *out, struct btree_iter *iter, bool fixup, bool remove_stale) { - int i; struct bkey *k, *last = NULL; BKEY_PADDED(k) tmp; bool (*bad)(struct btree_keys *, const struct bkey *) = remove_stale ? bch_ptr_bad : bch_ptr_invalid; + const struct min_heap_callbacks callbacks = { + .less = b->ops->sort_cmp, + .swp = new_btree_iter_swap, + }; /* Heapify the iterator, using our comparison function */ - for (i = iter->used / 2 - 1; i >= 0; --i) - heap_sift(iter, i, b->ops->sort_cmp); + min_heapify_all(&iter->heap, &callbacks, NULL); while (!btree_iter_end(iter)) { if (b->ops->sort_fixup && fixup) @@ -1296,6 +1327,7 @@ void bch_btree_sort_partial(struct btree_keys *b, unsigned int start, struct btree_iter iter; int oldsize = bch_count_data(b); + min_heap_init(&iter.heap, NULL, MAX_BSETS); __bch_btree_iter_init(b, &iter, NULL, &b->set[start]); if (start) { @@ -1325,6 +1357,8 @@ void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new, uint64_t start_time = local_clock(); struct btree_iter iter; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + bch_btree_iter_init(b, &iter, NULL); btree_mergesort(b, new->set->data, &iter, false, true); diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h index d795c84246b0..f79441acd4c1 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -187,8 +187,9 @@ struct bset_tree { }; struct btree_keys_ops { - bool (*sort_cmp)(struct btree_iter_set l, - struct btree_iter_set r); + bool (*sort_cmp)(const void *l, + const void *r, + void *args); struct bkey *(*sort_fixup)(struct btree_iter *iter, struct bkey *tmp); bool (*insert_fixup)(struct btree_keys *b, @@ -312,16 +313,17 @@ enum { BTREE_INSERT_STATUS_FRONT_MERGE, }; +struct btree_iter_set { + struct bkey *k, *end; +}; + /* Btree key iteration */ struct btree_iter { - size_t size, used; #ifdef CONFIG_BCACHE_DEBUG struct btree_keys *b; #endif - struct btree_iter_set { - struct bkey *k, *end; - } data[MAX_BSETS]; + MIN_HEAP_PREALLOCATED(struct btree_iter_set, btree_iter_heap, MAX_BSETS) heap; }; typedef bool (*ptr_filter_fn)(struct btree_keys *b, const struct bkey *k); diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 196cdacce38f..a2bb86d52ad4 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -157,8 +157,8 @@ void bch_btree_node_read_done(struct btree *b) * See the comment arount cache_set->fill_iter. */ iter = mempool_alloc(&b->c->fill_iter, GFP_NOIO); - iter->size = b->c->cache->sb.bucket_size / b->c->cache->sb.block_size; - iter->used = 0; + iter->heap.size = b->c->cache->sb.bucket_size / b->c->cache->sb.block_size; + iter->heap.nr = 0; #ifdef CONFIG_BCACHE_DEBUG iter->b = &b->keys; @@ -1312,6 +1312,8 @@ static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc) struct btree_iter iter; struct bset_tree *t; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + gc->nodes++; for_each_key_filter(&b->keys, k, &iter, bch_ptr_invalid) { @@ -1573,6 +1575,8 @@ static unsigned int btree_gc_count_keys(struct btree *b) struct btree_iter iter; unsigned int ret = 0; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) ret += bkey_u64s(k); @@ -1615,6 +1619,7 @@ static int btree_gc_recurse(struct btree *b, struct btree_op *op, struct gc_merge_info r[GC_MERGE_NODES]; struct gc_merge_info *i, *last = r + ARRAY_SIZE(r) - 1; + min_heap_init(&iter.heap, NULL, MAX_BSETS); bch_btree_iter_init(&b->keys, &iter, &b->c->gc_done); for (i = r; i < r + ARRAY_SIZE(r); i++) @@ -1913,6 +1918,8 @@ static int bch_btree_check_recurse(struct btree *b, struct btree_op *op) struct bkey *k, *p = NULL; struct btree_iter iter; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + for_each_key_filter(&b->keys, k, &iter, bch_ptr_invalid) bch_initial_mark_key(b->c, b->level, k); @@ -1958,6 +1965,8 @@ static int bch_btree_check_thread(void *arg) cur_idx = prev_idx = 0; ret = 0; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + /* root node keys are checked before thread created */ bch_btree_iter_init(&c->root->keys, &iter, NULL); k = bch_btree_iter_next_filter(&iter, &c->root->keys, bch_ptr_bad); @@ -2054,6 +2063,8 @@ int bch_btree_check(struct cache_set *c) struct btree_iter iter; struct btree_check_state check_state; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + /* check and mark root node keys */ for_each_key_filter(&c->root->keys, k, &iter, bch_ptr_invalid) bch_initial_mark_key(c, c->root->level, k); @@ -2549,6 +2560,7 @@ static int bch_btree_map_nodes_recurse(struct btree *b, struct btree_op *op, struct bkey *k; struct btree_iter iter; + min_heap_init(&iter.heap, NULL, MAX_BSETS); bch_btree_iter_init(&b->keys, &iter, from); while ((k = bch_btree_iter_next_filter(&iter, &b->keys, @@ -2582,6 +2594,7 @@ int bch_btree_map_keys_recurse(struct btree *b, struct btree_op *op, struct bkey *k; struct btree_iter iter; + min_heap_init(&iter.heap, NULL, MAX_BSETS); bch_btree_iter_init(&b->keys, &iter, from); while ((k = bch_btree_iter_next_filter(&iter, &b->keys, bch_ptr_bad))) { diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c index d626ffcbecb9..a7221e5dbe81 100644 --- a/drivers/md/bcache/extents.c +++ b/drivers/md/bcache/extents.c @@ -33,15 +33,16 @@ static void sort_key_next(struct btree_iter *iter, i->k = bkey_next(i->k); if (i->k == i->end) - *i = iter->data[--iter->used]; + *i = iter->heap.data[--iter->heap.nr]; } -static bool bch_key_sort_cmp(struct btree_iter_set l, - struct btree_iter_set r) +static bool new_bch_key_sort_cmp(const void *l, const void *r, void *args) { - int64_t c = bkey_cmp(l.k, r.k); + struct btree_iter_set *_l = (struct btree_iter_set *)l; + struct btree_iter_set *_r = (struct btree_iter_set *)r; + int64_t c = bkey_cmp(_l->k, _r->k); - return c ? c > 0 : l.k < r.k; + return !(c ? c > 0 : _l->k < _r->k); } static bool __ptr_invalid(struct cache_set *c, const struct bkey *k) @@ -238,7 +239,7 @@ static bool bch_btree_ptr_insert_fixup(struct btree_keys *bk, } const struct btree_keys_ops bch_btree_keys_ops = { - .sort_cmp = bch_key_sort_cmp, + .sort_cmp = new_bch_key_sort_cmp, .insert_fixup = bch_btree_ptr_insert_fixup, .key_invalid = bch_btree_ptr_invalid, .key_bad = bch_btree_ptr_bad, @@ -255,22 +256,36 @@ const struct btree_keys_ops bch_btree_keys_ops = { * Necessary for btree_sort_fixup() - if there are multiple keys that compare * equal in different sets, we have to process them newest to oldest. */ -static bool bch_extent_sort_cmp(struct btree_iter_set l, - struct btree_iter_set r) + +static bool new_bch_extent_sort_cmp(const void *l, const void *r, void __always_unused *args) +{ + struct btree_iter_set *_l = (struct btree_iter_set *)l; + struct btree_iter_set *_r = (struct btree_iter_set *)r; + int64_t c = bkey_cmp(&START_KEY(_l->k), &START_KEY(_r->k)); + + return !(c ? c > 0 : _l->k < _r->k); +} + +static inline void new_btree_iter_swap(void *iter1, void *iter2, void __always_unused *args) { - int64_t c = bkey_cmp(&START_KEY(l.k), &START_KEY(r.k)); + struct btree_iter_set *_iter1 = iter1; + struct btree_iter_set *_iter2 = iter2; - return c ? c > 0 : l.k < r.k; + swap(*_iter1, *_iter2); } static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter, struct bkey *tmp) { - while (iter->used > 1) { - struct btree_iter_set *top = iter->data, *i = top + 1; - - if (iter->used > 2 && - bch_extent_sort_cmp(i[0], i[1])) + const struct min_heap_callbacks callbacks = { + .less = new_bch_extent_sort_cmp, + .swp = new_btree_iter_swap, + }; + while (iter->heap.nr > 1) { + struct btree_iter_set *top = iter->heap.data, *i = top + 1; + + if (iter->heap.nr > 2 && + !new_bch_extent_sort_cmp(&i[0], &i[1], NULL)) i++; if (bkey_cmp(top->k, &START_KEY(i->k)) <= 0) @@ -278,7 +293,7 @@ static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter, if (!KEY_SIZE(i->k)) { sort_key_next(iter, i); - heap_sift(iter, i - top, bch_extent_sort_cmp); + min_heap_sift_down(&iter->heap, i - top, &callbacks, NULL); continue; } @@ -288,7 +303,7 @@ static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter, else bch_cut_front(top->k, i->k); - heap_sift(iter, i - top, bch_extent_sort_cmp); + min_heap_sift_down(&iter->heap, i - top, &callbacks, NULL); } else { /* can't happen because of comparison func */ BUG_ON(!bkey_cmp(&START_KEY(top->k), &START_KEY(i->k))); @@ -298,7 +313,7 @@ static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter, bch_cut_back(&START_KEY(i->k), tmp); bch_cut_front(i->k, top->k); - heap_sift(iter, 0, bch_extent_sort_cmp); + min_heap_sift_down(&iter->heap, 0, &callbacks, NULL); return tmp; } else { @@ -618,7 +633,7 @@ static bool bch_extent_merge(struct btree_keys *bk, } const struct btree_keys_ops bch_extent_keys_ops = { - .sort_cmp = bch_extent_sort_cmp, + .sort_cmp = new_bch_extent_sort_cmp, .sort_fixup = bch_extent_sort_fixup, .insert_fixup = bch_extent_insert_fixup, .key_invalid = bch_extent_invalid, diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c index ebd500bdf0b2..7f482729c56d 100644 --- a/drivers/md/bcache/movinggc.c +++ b/drivers/md/bcache/movinggc.c @@ -182,16 +182,27 @@ err: if (!IS_ERR_OR_NULL(w->private)) closure_sync(&cl); } -static bool bucket_cmp(struct bucket *l, struct bucket *r) +static bool new_bucket_cmp(const void *l, const void *r, void __always_unused *args) { - return GC_SECTORS_USED(l) < GC_SECTORS_USED(r); + struct bucket **_l = (struct bucket **)l; + struct bucket **_r = (struct bucket **)r; + + return GC_SECTORS_USED(*_l) >= GC_SECTORS_USED(*_r); +} + +static void new_bucket_swap(void *l, void *r, void __always_unused *args) +{ + struct bucket **_l = l; + struct bucket **_r = r; + + swap(*_l, *_r); } static unsigned int bucket_heap_top(struct cache *ca) { struct bucket *b; - return (b = heap_peek(&ca->heap)) ? GC_SECTORS_USED(b) : 0; + return (b = min_heap_peek(&ca->heap)[0]) ? GC_SECTORS_USED(b) : 0; } void bch_moving_gc(struct cache_set *c) @@ -199,6 +210,10 @@ void bch_moving_gc(struct cache_set *c) struct cache *ca = c->cache; struct bucket *b; unsigned long sectors_to_move, reserve_sectors; + const struct min_heap_callbacks callbacks = { + .less = new_bucket_cmp, + .swp = new_bucket_swap, + }; if (!c->copy_gc_enabled) return; @@ -209,7 +224,7 @@ void bch_moving_gc(struct cache_set *c) reserve_sectors = ca->sb.bucket_size * fifo_used(&ca->free[RESERVE_MOVINGGC]); - ca->heap.used = 0; + ca->heap.nr = 0; for_each_bucket(b, ca) { if (GC_MARK(b) == GC_MARK_METADATA || @@ -218,25 +233,31 @@ void bch_moving_gc(struct cache_set *c) atomic_read(&b->pin)) continue; - if (!heap_full(&ca->heap)) { + if (!min_heap_full(&ca->heap)) { sectors_to_move += GC_SECTORS_USED(b); - heap_add(&ca->heap, b, bucket_cmp); - } else if (bucket_cmp(b, heap_peek(&ca->heap))) { + min_heap_push(&ca->heap, &b, &callbacks, NULL); + } else if (!new_bucket_cmp(&b, min_heap_peek(&ca->heap), ca)) { sectors_to_move -= bucket_heap_top(ca); sectors_to_move += GC_SECTORS_USED(b); ca->heap.data[0] = b; - heap_sift(&ca->heap, 0, bucket_cmp); + min_heap_sift_down(&ca->heap, 0, &callbacks, NULL); } } while (sectors_to_move > reserve_sectors) { - heap_pop(&ca->heap, b, bucket_cmp); + if (ca->heap.nr) { + b = min_heap_peek(&ca->heap)[0]; + min_heap_pop(&ca->heap, &callbacks, NULL); + } sectors_to_move -= GC_SECTORS_USED(b); } - while (heap_pop(&ca->heap, b, bucket_cmp)) + while (ca->heap.nr) { + b = min_heap_peek(&ca->heap)[0]; + min_heap_pop(&ca->heap, &callbacks, NULL); SET_GC_MOVE(b, 1); + } mutex_unlock(&c->bucket_lock); diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 6956beb55326..e8f696cb58c0 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -662,6 +662,8 @@ static unsigned int bch_root_usage(struct cache_set *c) struct btree *b; struct btree_iter iter; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + goto lock_root; do { diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h index f61ab1bada6c..539454d8e2d0 100644 --- a/drivers/md/bcache/util.h +++ b/drivers/md/bcache/util.h @@ -9,6 +9,7 @@ #include <linux/kernel.h> #include <linux/sched/clock.h> #include <linux/llist.h> +#include <linux/min_heap.h> #include <linux/ratelimit.h> #include <linux/vmalloc.h> #include <linux/workqueue.h> @@ -30,16 +31,10 @@ struct closure; #endif -#define DECLARE_HEAP(type, name) \ - struct { \ - size_t size, used; \ - type *data; \ - } name - #define init_heap(heap, _size, gfp) \ ({ \ size_t _bytes; \ - (heap)->used = 0; \ + (heap)->nr = 0; \ (heap)->size = (_size); \ _bytes = (heap)->size * sizeof(*(heap)->data); \ (heap)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL); \ @@ -52,64 +47,6 @@ do { \ (heap)->data = NULL; \ } while (0) -#define heap_swap(h, i, j) swap((h)->data[i], (h)->data[j]) - -#define heap_sift(h, i, cmp) \ -do { \ - size_t _r, _j = i; \ - \ - for (; _j * 2 + 1 < (h)->used; _j = _r) { \ - _r = _j * 2 + 1; \ - if (_r + 1 < (h)->used && \ - cmp((h)->data[_r], (h)->data[_r + 1])) \ - _r++; \ - \ - if (cmp((h)->data[_r], (h)->data[_j])) \ - break; \ - heap_swap(h, _r, _j); \ - } \ -} while (0) - -#define heap_sift_down(h, i, cmp) \ -do { \ - while (i) { \ - size_t p = (i - 1) / 2; \ - if (cmp((h)->data[i], (h)->data[p])) \ - break; \ - heap_swap(h, i, p); \ - i = p; \ - } \ -} while (0) - -#define heap_add(h, d, cmp) \ -({ \ - bool _r = !heap_full(h); \ - if (_r) { \ - size_t _i = (h)->used++; \ - (h)->data[_i] = d; \ - \ - heap_sift_down(h, _i, cmp); \ - heap_sift(h, _i, cmp); \ - } \ - _r; \ -}) - -#define heap_pop(h, d, cmp) \ -({ \ - bool _r = (h)->used; \ - if (_r) { \ - (d) = (h)->data[0]; \ - (h)->used--; \ - heap_swap(h, 0, (h)->used); \ - heap_sift(h, 0, cmp); \ - } \ - _r; \ -}) - -#define heap_peek(h) ((h)->used ? (h)->data[0] : NULL) - -#define heap_full(h) ((h)->used == (h)->size) - #define DECLARE_FIFO(type, name) \ struct { \ size_t front, back, size, mask; \ diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c index 8827a6f130ad..c1d28e365910 100644 --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -915,6 +915,7 @@ static int bch_dirty_init_thread(void *arg) k = p = NULL; prev_idx = 0; + min_heap_init(&iter.heap, NULL, MAX_BSETS); bch_btree_iter_init(&c->root->keys, &iter, NULL); k = bch_btree_iter_next_filter(&iter, &c->root->keys, bch_ptr_bad); BUG_ON(!k); @@ -984,6 +985,8 @@ void bch_sectors_dirty_init(struct bcache_device *d) struct cache_set *c = d->c; struct bch_dirty_init_state state; + min_heap_init(&iter.heap, NULL, MAX_BSETS); + retry_lock: b = c->root; rw_lock(0, b, b->level); -- 2.34.1
