On Sun, Apr 07, 2024 at 12:47:26AM +0800, Kuan-Wei Chiu wrote: > 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 <visitorckw@xxxxxxxxx> > Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx> Acked-by: Coly Li <colyli@xxxxxxx> Thanks. Coly Li > --- > Changes in v3: > - Correct bugs where the parameter types in some compare functions > should have been 'type **', but were mistakenly written as 'type *'. > > 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 > -- Coly Li
