| Message ID | 20240320145417.336208-15-visitorckw@gmail.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | Mike Snitzer |
| Headers | show |
| Series | treewide: Refactor heap related implementation | expand |
On Wed, Mar 20, 2024 at 7:55 AM Kuan-Wei Chiu <visitorckw@gmail.com> 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@gmail.com> I think this is a useful clean up but I'm unfamiliar with bcache and its concerns. Reviewed-by: Ian Rogers <irogers@google.com> Thanks, Ian > --- > Changes in v2: > - Add attribute __always_unused to the compare and swap functions that > do not use the args parameter. > - Rename min_heapify() to min_heap_sift_down(). > - Refine the commit message. > > drivers/md/bcache/alloc.c | 66 +++++++++++++++++++++-------- > drivers/md/bcache/bcache.h | 2 +- > drivers/md/bcache/bset.c | 73 ++++++++++++++++++++++---------- > drivers/md/bcache/bset.h | 38 ++++++++++------- > drivers/md/bcache/btree.c | 27 +++++++++++- > drivers/md/bcache/extents.c | 44 ++++++++++++-------- > drivers/md/bcache/movinggc.c | 40 +++++++++++++----- > drivers/md/bcache/super.c | 16 +++++++ > drivers/md/bcache/sysfs.c | 3 ++ > drivers/md/bcache/util.h | 81 +----------------------------------- > 10 files changed, 224 insertions(+), 166 deletions(-) > > diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c > index ce13c272c387..b27c0e25b661 100644 > --- a/drivers/md/bcache/alloc.c > +++ b/drivers/md/bcache/alloc.c > @@ -166,40 +166,70 @@ 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 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 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 bucket_prio(ca, lhs) > bucket_prio(ca, rhs); > +} > + > +static inline bool 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 bucket_prio(ca, lhs) < bucket_prio(ca, rhs); > +} > + > +static inline void bucket_swap(void *l, void *r, void __always_unused *args) > +{ > + struct bucket *lhs = l, *rhs = r; > > -#define bucket_max_cmp(l, r) (bucket_prio(l) < bucket_prio(r)) > -#define bucket_min_cmp(l, r) (bucket_prio(l) > bucket_prio(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 = bucket_max_cmp, > + .swp = bucket_swap, > + }; > + const struct min_heap_callbacks bucket_min_cmp_callback = { > + .less = bucket_min_cmp, > + .swp = bucket_swap, > + }; > > - ca->heap.used = 0; > + ca->heap.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))) { > - ca->heap.data[0] = b; > - heap_sift(&ca->heap, 0, bucket_max_cmp); > + if (!min_heap_full(&ca->heap)) > + min_heap_push(&ca->heap, b, &bucket_max_cmp_callback, ca); > + else if (!bucket_max_cmp(b, min_heap_peek(&ca->heap), ca)) { > + *min_heap_peek(&ca->heap) = b; > + 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)) { > + b = *min_heap_peek(&ca->heap); > + if (!min_heap_pop(&ca->heap, &bucket_min_cmp_callback, ca)) { > /* > * We don't want to be calling invalidate_buckets() > * multiple times when it can't do anything > diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h > index 4e6afa89921f..97b0a1768ba7 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 *, 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..6b1c8ac0f866 100644 > --- a/drivers/md/bcache/bset.c > +++ b/drivers/md/bcache/bset.c > @@ -56,7 +56,9 @@ int __bch_count_data(struct btree_keys *b) > unsigned int ret = 0; > struct btree_iter iter; > struct bkey *k; > + struct btree_iter_set data[MAX_BSETS]; > > + iter.heap.heap.data = data; > if (b->ops->is_extents) > for_each_key(b, k, &iter) > ret += KEY_SIZE(k); > @@ -69,6 +71,9 @@ void __bch_check_keys(struct btree_keys *b, const char *fmt, ...) > struct bkey *k, *p = NULL; > struct btree_iter iter; > const char *err; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > for_each_key(b, k, &iter) { > if (b->ops->is_extents) { > @@ -110,9 +115,9 @@ 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 = min_heap_peek(&iter->heap)->k, *next = bkey_next(k); > > - if (next < iter->data->end && > + if (next < min_heap_peek(&iter->heap)->end && > bkey_cmp(k, iter->b->ops->is_extents ? > &START_KEY(next) : next) > 0) { > bch_dump_bucket(iter->b); > @@ -882,6 +887,9 @@ unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k, > struct btree_iter iter; > struct bkey preceding_key_on_stack = ZERO_KEY; > struct bkey *preceding_key_p = &preceding_key_on_stack; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > BUG_ON(b->ops->is_extents && !KEY_SIZE(k)); > > @@ -1077,27 +1085,34 @@ 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 (btree_iter_cmp_fn)(const void *, const void *, void *); > > -static inline bool btree_iter_cmp(struct btree_iter_set l, > - struct btree_iter_set r) > +static inline bool btree_iter_cmp(const void *l, const void *r, void __always_unused *args) > { > - return bkey_cmp(l.k, r.k) > 0; > + 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_end(struct btree_iter *iter) > { > - return !iter->used; > + return !iter->heap.heap.nr; > } > > void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k, > struct bkey *end) > { > + const struct min_heap_callbacks callbacks = { > + .less = btree_iter_cmp, > + .swp = 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 +1122,8 @@ 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.heap.size = MAX_BSETS; > + iter->heap.heap.nr = 0; > > #ifdef CONFIG_BCACHE_DEBUG > iter->b = b; > @@ -1134,22 +1149,28 @@ static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter, > { > struct btree_iter_set b __maybe_unused; > struct bkey *ret = NULL; > + const struct min_heap_callbacks callbacks = { > + .less = cmp, > + .swp = 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 = min_heap_peek(&iter->heap)->k; > + min_heap_peek(&iter->heap)->k = bkey_next(min_heap_peek(&iter->heap)->k); > > - if (iter->data->k > iter->data->end) { > + if (min_heap_peek(&iter->heap)->k > min_heap_peek(&iter->heap)->end) { > WARN_ONCE(1, "bset was corrupt!\n"); > - iter->data->k = iter->data->end; > + min_heap_peek(&iter->heap)->k = min_heap_peek(&iter->heap)->end; > } > > - if (iter->data->k == iter->data->end) > - heap_pop(iter, b, cmp); > + if (min_heap_peek(&iter->heap)->k == min_heap_peek(&iter->heap)->end) { > + b = *min_heap_peek(&iter->heap); > + min_heap_pop(&iter->heap, &callbacks, NULL); > + } > else > - heap_sift(iter, 0, cmp); > + min_heap_sift_down(&iter->heap, 0, &callbacks, NULL); > } > > return ret; > @@ -1195,16 +1216,18 @@ 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 = 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) > @@ -1295,7 +1318,9 @@ void bch_btree_sort_partial(struct btree_keys *b, unsigned int start, > size_t order = b->page_order, keys = 0; > struct btree_iter iter; > int oldsize = bch_count_data(b); > + struct btree_iter_set data[MAX_BSETS]; > > + iter.heap.heap.data = data; > __bch_btree_iter_init(b, &iter, NULL, &b->set[start]); > > if (start) { > @@ -1324,7 +1349,9 @@ void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new, > { > uint64_t start_time = local_clock(); > struct btree_iter iter; > + struct btree_iter_set data[MAX_BSETS]; > > + iter.heap.heap.data = data; > 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..e9559486a4c5 100644 > --- a/drivers/md/bcache/bset.h > +++ b/drivers/md/bcache/bset.h > @@ -152,6 +152,19 @@ struct btree_iter; > struct btree_iter_set; > struct bkey_float; > > +/* Btree key iteration */ > + > +struct btree_iter_set { > + struct bkey *k, *end; > +}; > + > +struct btree_iter { > +#ifdef CONFIG_BCACHE_DEBUG > + struct btree_keys *b; > +#endif > + MIN_HEAP(struct btree_iter_set, btree_iter_heap) heap; > +}; > + > #define MAX_BSETS 4U > > struct bset_tree { > @@ -187,8 +200,9 @@ 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, > @@ -258,6 +272,14 @@ static inline unsigned int bset_sector_offset(struct btree_keys *b, > return bset_byte_offset(b, i) >> 9; > } > > +static inline void btree_iter_swap(void *iter1, void *iter2, void __always_unused *args) > +{ > + struct btree_iter_set *_iter1 = iter1; > + struct btree_iter_set *_iter2 = iter2; > + > + swap(*_iter1, *_iter2); > +} > + > #define __set_bytes(i, k) (sizeof(*(i)) + (k) * sizeof(uint64_t)) > #define set_bytes(i) __set_bytes(i, i->keys) > > @@ -312,18 +334,6 @@ enum { > BTREE_INSERT_STATUS_FRONT_MERGE, > }; > > -/* 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]; > -}; > - > typedef bool (*ptr_filter_fn)(struct btree_keys *b, const struct bkey *k); > > struct bkey *bch_btree_iter_next(struct btree_iter *iter); > diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c > index 196cdacce38f..e7333a8c4819 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.heap.size = b->c->cache->sb.bucket_size / b->c->cache->sb.block_size; > + iter->heap.heap.nr = 0; > > #ifdef CONFIG_BCACHE_DEBUG > iter->b = &b->keys; > @@ -1311,6 +1311,9 @@ static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc) > struct bkey *k; > struct btree_iter iter; > struct bset_tree *t; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > gc->nodes++; > > @@ -1572,6 +1575,9 @@ static unsigned int btree_gc_count_keys(struct btree *b) > struct bkey *k; > struct btree_iter iter; > unsigned int ret = 0; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) > ret += bkey_u64s(k); > @@ -1614,6 +1620,9 @@ static int btree_gc_recurse(struct btree *b, struct btree_op *op, > struct btree_iter iter; > struct gc_merge_info r[GC_MERGE_NODES]; > struct gc_merge_info *i, *last = r + ARRAY_SIZE(r) - 1; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > bch_btree_iter_init(&b->keys, &iter, &b->c->gc_done); > > @@ -1912,6 +1921,9 @@ static int bch_btree_check_recurse(struct btree *b, struct btree_op *op) > int ret = 0; > struct bkey *k, *p = NULL; > struct btree_iter iter; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > for_each_key_filter(&b->keys, k, &iter, bch_ptr_invalid) > bch_initial_mark_key(b->c, b->level, k); > @@ -1953,7 +1965,9 @@ static int bch_btree_check_thread(void *arg) > struct btree_iter iter; > struct bkey *k, *p; > int cur_idx, prev_idx, skip_nr; > + struct btree_iter_set data[MAX_BSETS]; > > + iter.heap.heap.data = data; > k = p = NULL; > cur_idx = prev_idx = 0; > ret = 0; > @@ -2053,6 +2067,9 @@ int bch_btree_check(struct cache_set *c) > struct bkey *k = NULL; > struct btree_iter iter; > struct btree_check_state check_state; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > /* check and mark root node keys */ > for_each_key_filter(&c->root->keys, k, &iter, bch_ptr_invalid) > @@ -2548,6 +2565,9 @@ static int bch_btree_map_nodes_recurse(struct btree *b, struct btree_op *op, > if (b->level) { > struct bkey *k; > struct btree_iter iter; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > bch_btree_iter_init(&b->keys, &iter, from); > > @@ -2581,6 +2601,9 @@ int bch_btree_map_keys_recurse(struct btree *b, struct btree_op *op, > int ret = MAP_CONTINUE; > struct bkey *k; > struct btree_iter iter; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > bch_btree_iter_init(&b->keys, &iter, from); > > diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c > index d626ffcbecb9..8279596004f5 100644 > --- a/drivers/md/bcache/extents.c > +++ b/drivers/md/bcache/extents.c > @@ -32,16 +32,19 @@ 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]; > + if (i->k == i->end) { > + struct btree_iter_set *data = iter->heap.heap.data; > + *i = data[--iter->heap.heap.nr]; > + } > } > > -static bool bch_key_sort_cmp(struct btree_iter_set l, > - struct btree_iter_set r) > +static bool 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) > @@ -255,22 +258,29 @@ 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 bch_extent_sort_cmp(const void *l, const void *r, void __always_unused *args) > { > - int64_t c = bkey_cmp(&START_KEY(l.k), &START_KEY(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(&START_KEY(_l->k), &START_KEY(_r->k)); > > - return c ? c > 0 : l.k < r.k; > + return !(c ? c > 0 : _l->k < _r->k); > } > > 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; > + const struct min_heap_callbacks callbacks = { > + .less = bch_extent_sort_cmp, > + .swp = btree_iter_swap, > + }; > + > + while (iter->heap.heap.nr > 1) { > + struct btree_iter_set *top = min_heap_peek(&iter->heap), *i = top + 1; > > - if (iter->used > 2 && > - bch_extent_sort_cmp(i[0], i[1])) > + if (iter->heap.heap.nr > 2 && > + !bch_extent_sort_cmp(&i[0], &i[1], NULL)) > i++; > > if (bkey_cmp(top->k, &START_KEY(i->k)) <= 0) > @@ -278,7 +288,7 @@ 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 +298,7 @@ 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 +308,7 @@ 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 { > diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c > index ebd500bdf0b2..0f50192fea2c 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 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 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)) ? 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 = bucket_cmp, > + .swp = 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.heap.nr = 0; > > for_each_bucket(b, ca) { > if (GC_MARK(b) == GC_MARK_METADATA || > @@ -218,25 +233,28 @@ 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 (!bucket_cmp(b, min_heap_peek(&ca->heap), NULL)) { > 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_peek(&ca->heap) = b; > + min_heap_sift_down(&ca->heap, 0, &callbacks, NULL); > } > } > > while (sectors_to_move > reserve_sectors) { > - heap_pop(&ca->heap, b, bucket_cmp); > + b = *min_heap_peek(&ca->heap); > + min_heap_pop(&ca->heap, &callbacks, NULL); > sectors_to_move -= GC_SECTORS_USED(b); > } > > - while (heap_pop(&ca->heap, b, bucket_cmp)) > + while ((b = *min_heap_peek(&ca->heap))) { > + min_heap_pop(&ca->heap, &callbacks, NULL); > SET_GC_MOVE(b, 1); > + } > > mutex_unlock(&c->bucket_lock); > > diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c > index 330bcd9ea4a9..1c6aeeff2cc3 100644 > --- a/drivers/md/bcache/super.c > +++ b/drivers/md/bcache/super.c > @@ -2193,6 +2193,22 @@ static const char *register_cache_set(struct cache *ca) > return err; > } > > +static inline bool init_heap(struct heap *heap, size_t size, gfp_t gfp) > +{ > + size_t bytes = size * sizeof(struct bucket *); > + void *data = kvmalloc(bytes, (gfp) & GFP_KERNEL); > + > + min_heap_init(heap, data, size); > + > + return data; > +} > + > +static inline void free_heap(struct heap *heap) > +{ > + kvfree(heap->heap.data); > + heap->heap.data = NULL; > +} > + > /* Cache device */ > > /* When ca->kobj released */ > diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c > index 6956beb55326..eac2039c2cad 100644 > --- a/drivers/md/bcache/sysfs.c > +++ b/drivers/md/bcache/sysfs.c > @@ -661,6 +661,9 @@ static unsigned int bch_root_usage(struct cache_set *c) > struct bkey *k; > struct btree *b; > struct btree_iter iter; > + struct btree_iter_set data[MAX_BSETS]; > + > + iter.heap.heap.data = data; > > goto lock_root; > > diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h > index f61ab1bada6c..fa928d1d327a 100644 > --- a/drivers/md/bcache/util.h > +++ b/drivers/md/bcache/util.h > @@ -7,6 +7,7 @@ > #include <linux/closure.h> > #include <linux/errno.h> > #include <linux/kernel.h> > +#include <linux/min_heap.h> > #include <linux/sched/clock.h> > #include <linux/llist.h> > #include <linux/ratelimit.h> > @@ -30,86 +31,6 @@ 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)->size = (_size); \ > - _bytes = (heap)->size * sizeof(*(heap)->data); \ > - (heap)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL); \ > - (heap)->data; \ > -}) > - > -#define free_heap(heap) \ > -do { \ > - kvfree((heap)->data); \ > - (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; \ > -- > 2.34.1 >
diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c index ce13c272c387..b27c0e25b661 100644 --- a/drivers/md/bcache/alloc.c +++ b/drivers/md/bcache/alloc.c @@ -166,40 +166,70 @@ 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 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 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 bucket_prio(ca, lhs) > bucket_prio(ca, rhs); +} + +static inline bool 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 bucket_prio(ca, lhs) < bucket_prio(ca, rhs); +} + +static inline void bucket_swap(void *l, void *r, void __always_unused *args) +{ + struct bucket *lhs = l, *rhs = r; -#define bucket_max_cmp(l, r) (bucket_prio(l) < bucket_prio(r)) -#define bucket_min_cmp(l, r) (bucket_prio(l) > bucket_prio(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 = bucket_max_cmp, + .swp = bucket_swap, + }; + const struct min_heap_callbacks bucket_min_cmp_callback = { + .less = bucket_min_cmp, + .swp = bucket_swap, + }; - ca->heap.used = 0; + ca->heap.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))) { - ca->heap.data[0] = b; - heap_sift(&ca->heap, 0, bucket_max_cmp); + if (!min_heap_full(&ca->heap)) + min_heap_push(&ca->heap, b, &bucket_max_cmp_callback, ca); + else if (!bucket_max_cmp(b, min_heap_peek(&ca->heap), ca)) { + *min_heap_peek(&ca->heap) = b; + 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)) { + b = *min_heap_peek(&ca->heap); + if (!min_heap_pop(&ca->heap, &bucket_min_cmp_callback, ca)) { /* * We don't want to be calling invalidate_buckets() * multiple times when it can't do anything diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 4e6afa89921f..97b0a1768ba7 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 *, 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..6b1c8ac0f866 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -56,7 +56,9 @@ int __bch_count_data(struct btree_keys *b) unsigned int ret = 0; struct btree_iter iter; struct bkey *k; + struct btree_iter_set data[MAX_BSETS]; + iter.heap.heap.data = data; if (b->ops->is_extents) for_each_key(b, k, &iter) ret += KEY_SIZE(k); @@ -69,6 +71,9 @@ void __bch_check_keys(struct btree_keys *b, const char *fmt, ...) struct bkey *k, *p = NULL; struct btree_iter iter; const char *err; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; for_each_key(b, k, &iter) { if (b->ops->is_extents) { @@ -110,9 +115,9 @@ 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 = min_heap_peek(&iter->heap)->k, *next = bkey_next(k); - if (next < iter->data->end && + if (next < min_heap_peek(&iter->heap)->end && bkey_cmp(k, iter->b->ops->is_extents ? &START_KEY(next) : next) > 0) { bch_dump_bucket(iter->b); @@ -882,6 +887,9 @@ unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k, struct btree_iter iter; struct bkey preceding_key_on_stack = ZERO_KEY; struct bkey *preceding_key_p = &preceding_key_on_stack; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; BUG_ON(b->ops->is_extents && !KEY_SIZE(k)); @@ -1077,27 +1085,34 @@ 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 (btree_iter_cmp_fn)(const void *, const void *, void *); -static inline bool btree_iter_cmp(struct btree_iter_set l, - struct btree_iter_set r) +static inline bool btree_iter_cmp(const void *l, const void *r, void __always_unused *args) { - return bkey_cmp(l.k, r.k) > 0; + 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_end(struct btree_iter *iter) { - return !iter->used; + return !iter->heap.heap.nr; } void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k, struct bkey *end) { + const struct min_heap_callbacks callbacks = { + .less = btree_iter_cmp, + .swp = 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 +1122,8 @@ 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.heap.size = MAX_BSETS; + iter->heap.heap.nr = 0; #ifdef CONFIG_BCACHE_DEBUG iter->b = b; @@ -1134,22 +1149,28 @@ static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter, { struct btree_iter_set b __maybe_unused; struct bkey *ret = NULL; + const struct min_heap_callbacks callbacks = { + .less = cmp, + .swp = 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 = min_heap_peek(&iter->heap)->k; + min_heap_peek(&iter->heap)->k = bkey_next(min_heap_peek(&iter->heap)->k); - if (iter->data->k > iter->data->end) { + if (min_heap_peek(&iter->heap)->k > min_heap_peek(&iter->heap)->end) { WARN_ONCE(1, "bset was corrupt!\n"); - iter->data->k = iter->data->end; + min_heap_peek(&iter->heap)->k = min_heap_peek(&iter->heap)->end; } - if (iter->data->k == iter->data->end) - heap_pop(iter, b, cmp); + if (min_heap_peek(&iter->heap)->k == min_heap_peek(&iter->heap)->end) { + b = *min_heap_peek(&iter->heap); + min_heap_pop(&iter->heap, &callbacks, NULL); + } else - heap_sift(iter, 0, cmp); + min_heap_sift_down(&iter->heap, 0, &callbacks, NULL); } return ret; @@ -1195,16 +1216,18 @@ 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 = 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) @@ -1295,7 +1318,9 @@ void bch_btree_sort_partial(struct btree_keys *b, unsigned int start, size_t order = b->page_order, keys = 0; struct btree_iter iter; int oldsize = bch_count_data(b); + struct btree_iter_set data[MAX_BSETS]; + iter.heap.heap.data = data; __bch_btree_iter_init(b, &iter, NULL, &b->set[start]); if (start) { @@ -1324,7 +1349,9 @@ void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new, { uint64_t start_time = local_clock(); struct btree_iter iter; + struct btree_iter_set data[MAX_BSETS]; + iter.heap.heap.data = data; 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..e9559486a4c5 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -152,6 +152,19 @@ struct btree_iter; struct btree_iter_set; struct bkey_float; +/* Btree key iteration */ + +struct btree_iter_set { + struct bkey *k, *end; +}; + +struct btree_iter { +#ifdef CONFIG_BCACHE_DEBUG + struct btree_keys *b; +#endif + MIN_HEAP(struct btree_iter_set, btree_iter_heap) heap; +}; + #define MAX_BSETS 4U struct bset_tree { @@ -187,8 +200,9 @@ 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, @@ -258,6 +272,14 @@ static inline unsigned int bset_sector_offset(struct btree_keys *b, return bset_byte_offset(b, i) >> 9; } +static inline void btree_iter_swap(void *iter1, void *iter2, void __always_unused *args) +{ + struct btree_iter_set *_iter1 = iter1; + struct btree_iter_set *_iter2 = iter2; + + swap(*_iter1, *_iter2); +} + #define __set_bytes(i, k) (sizeof(*(i)) + (k) * sizeof(uint64_t)) #define set_bytes(i) __set_bytes(i, i->keys) @@ -312,18 +334,6 @@ enum { BTREE_INSERT_STATUS_FRONT_MERGE, }; -/* 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]; -}; - typedef bool (*ptr_filter_fn)(struct btree_keys *b, const struct bkey *k); struct bkey *bch_btree_iter_next(struct btree_iter *iter); diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 196cdacce38f..e7333a8c4819 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.heap.size = b->c->cache->sb.bucket_size / b->c->cache->sb.block_size; + iter->heap.heap.nr = 0; #ifdef CONFIG_BCACHE_DEBUG iter->b = &b->keys; @@ -1311,6 +1311,9 @@ static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc) struct bkey *k; struct btree_iter iter; struct bset_tree *t; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; gc->nodes++; @@ -1572,6 +1575,9 @@ static unsigned int btree_gc_count_keys(struct btree *b) struct bkey *k; struct btree_iter iter; unsigned int ret = 0; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) ret += bkey_u64s(k); @@ -1614,6 +1620,9 @@ static int btree_gc_recurse(struct btree *b, struct btree_op *op, struct btree_iter iter; struct gc_merge_info r[GC_MERGE_NODES]; struct gc_merge_info *i, *last = r + ARRAY_SIZE(r) - 1; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; bch_btree_iter_init(&b->keys, &iter, &b->c->gc_done); @@ -1912,6 +1921,9 @@ static int bch_btree_check_recurse(struct btree *b, struct btree_op *op) int ret = 0; struct bkey *k, *p = NULL; struct btree_iter iter; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; for_each_key_filter(&b->keys, k, &iter, bch_ptr_invalid) bch_initial_mark_key(b->c, b->level, k); @@ -1953,7 +1965,9 @@ static int bch_btree_check_thread(void *arg) struct btree_iter iter; struct bkey *k, *p; int cur_idx, prev_idx, skip_nr; + struct btree_iter_set data[MAX_BSETS]; + iter.heap.heap.data = data; k = p = NULL; cur_idx = prev_idx = 0; ret = 0; @@ -2053,6 +2067,9 @@ int bch_btree_check(struct cache_set *c) struct bkey *k = NULL; struct btree_iter iter; struct btree_check_state check_state; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; /* check and mark root node keys */ for_each_key_filter(&c->root->keys, k, &iter, bch_ptr_invalid) @@ -2548,6 +2565,9 @@ static int bch_btree_map_nodes_recurse(struct btree *b, struct btree_op *op, if (b->level) { struct bkey *k; struct btree_iter iter; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; bch_btree_iter_init(&b->keys, &iter, from); @@ -2581,6 +2601,9 @@ int bch_btree_map_keys_recurse(struct btree *b, struct btree_op *op, int ret = MAP_CONTINUE; struct bkey *k; struct btree_iter iter; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; bch_btree_iter_init(&b->keys, &iter, from); diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c index d626ffcbecb9..8279596004f5 100644 --- a/drivers/md/bcache/extents.c +++ b/drivers/md/bcache/extents.c @@ -32,16 +32,19 @@ 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]; + if (i->k == i->end) { + struct btree_iter_set *data = iter->heap.heap.data; + *i = data[--iter->heap.heap.nr]; + } } -static bool bch_key_sort_cmp(struct btree_iter_set l, - struct btree_iter_set r) +static bool 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) @@ -255,22 +258,29 @@ 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 bch_extent_sort_cmp(const void *l, const void *r, void __always_unused *args) { - int64_t c = bkey_cmp(&START_KEY(l.k), &START_KEY(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(&START_KEY(_l->k), &START_KEY(_r->k)); - return c ? c > 0 : l.k < r.k; + return !(c ? c > 0 : _l->k < _r->k); } 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; + const struct min_heap_callbacks callbacks = { + .less = bch_extent_sort_cmp, + .swp = btree_iter_swap, + }; + + while (iter->heap.heap.nr > 1) { + struct btree_iter_set *top = min_heap_peek(&iter->heap), *i = top + 1; - if (iter->used > 2 && - bch_extent_sort_cmp(i[0], i[1])) + if (iter->heap.heap.nr > 2 && + !bch_extent_sort_cmp(&i[0], &i[1], NULL)) i++; if (bkey_cmp(top->k, &START_KEY(i->k)) <= 0) @@ -278,7 +288,7 @@ 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 +298,7 @@ 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 +308,7 @@ 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 { diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c index ebd500bdf0b2..0f50192fea2c 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 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 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)) ? 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 = bucket_cmp, + .swp = 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.heap.nr = 0; for_each_bucket(b, ca) { if (GC_MARK(b) == GC_MARK_METADATA || @@ -218,25 +233,28 @@ 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 (!bucket_cmp(b, min_heap_peek(&ca->heap), NULL)) { 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_peek(&ca->heap) = b; + min_heap_sift_down(&ca->heap, 0, &callbacks, NULL); } } while (sectors_to_move > reserve_sectors) { - heap_pop(&ca->heap, b, bucket_cmp); + b = *min_heap_peek(&ca->heap); + min_heap_pop(&ca->heap, &callbacks, NULL); sectors_to_move -= GC_SECTORS_USED(b); } - while (heap_pop(&ca->heap, b, bucket_cmp)) + while ((b = *min_heap_peek(&ca->heap))) { + min_heap_pop(&ca->heap, &callbacks, NULL); SET_GC_MOVE(b, 1); + } mutex_unlock(&c->bucket_lock); diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 330bcd9ea4a9..1c6aeeff2cc3 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -2193,6 +2193,22 @@ static const char *register_cache_set(struct cache *ca) return err; } +static inline bool init_heap(struct heap *heap, size_t size, gfp_t gfp) +{ + size_t bytes = size * sizeof(struct bucket *); + void *data = kvmalloc(bytes, (gfp) & GFP_KERNEL); + + min_heap_init(heap, data, size); + + return data; +} + +static inline void free_heap(struct heap *heap) +{ + kvfree(heap->heap.data); + heap->heap.data = NULL; +} + /* Cache device */ /* When ca->kobj released */ diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 6956beb55326..eac2039c2cad 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -661,6 +661,9 @@ static unsigned int bch_root_usage(struct cache_set *c) struct bkey *k; struct btree *b; struct btree_iter iter; + struct btree_iter_set data[MAX_BSETS]; + + iter.heap.heap.data = data; goto lock_root; diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h index f61ab1bada6c..fa928d1d327a 100644 --- a/drivers/md/bcache/util.h +++ b/drivers/md/bcache/util.h @@ -7,6 +7,7 @@ #include <linux/closure.h> #include <linux/errno.h> #include <linux/kernel.h> +#include <linux/min_heap.h> #include <linux/sched/clock.h> #include <linux/llist.h> #include <linux/ratelimit.h> @@ -30,86 +31,6 @@ 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)->size = (_size); \ - _bytes = (heap)->size * sizeof(*(heap)->data); \ - (heap)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL); \ - (heap)->data; \ -}) - -#define free_heap(heap) \ -do { \ - kvfree((heap)->data); \ - (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; \
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@gmail.com> --- Changes in v2: - Add attribute __always_unused to the compare and swap functions that do not use the args parameter. - Rename min_heapify() to min_heap_sift_down(). - Refine the commit message. drivers/md/bcache/alloc.c | 66 +++++++++++++++++++++-------- drivers/md/bcache/bcache.h | 2 +- drivers/md/bcache/bset.c | 73 ++++++++++++++++++++++---------- drivers/md/bcache/bset.h | 38 ++++++++++------- drivers/md/bcache/btree.c | 27 +++++++++++- drivers/md/bcache/extents.c | 44 ++++++++++++-------- drivers/md/bcache/movinggc.c | 40 +++++++++++++----- drivers/md/bcache/super.c | 16 +++++++ drivers/md/bcache/sysfs.c | 3 ++ drivers/md/bcache/util.h | 81 +----------------------------------- 10 files changed, 224 insertions(+), 166 deletions(-)