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diff --git a/lib/generic/lru.c b/lib/generic/lru.c
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+/* Copyright (C) 2016-2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "lib/generic/lru.h"
+#include "contrib/murmurhash3/murmurhash3.h"
+#include "contrib/ucw/mempool.h"
+
+typedef struct lru_group lru_group_t;
+
+struct lru_item {
+ uint16_t key_len, val_len; /**< Two bytes should be enough for our purposes. */
+ char data[];
+ /**< Place for both key and value.
+ *
+ * We use "char" to satisfy the C99+ aliasing rules.
+ * See C99 section 6.5 Expressions, paragraph 7.
+ * Any type can be accessed through char-pointer,
+ * so we can use a common struct definition
+ * for all types being held.
+ *
+ * The value address is restricted by val_alignment.
+ * Approach: require slightly larger sizes from the allocator
+ * and shift value on the closest address with val_alignment.
+ */
+};
+
+/** @brief Round the value up to a multiple of mul (a power of two). */
+static inline size_t round_power(size_t size, size_t mult)
+{
+ assert(__builtin_popcount(mult) == 1);
+ size_t res = ((size - 1) & ~(mult - 1)) + mult;
+ assert(__builtin_ctz(res) >= __builtin_ctz(mult));
+ assert(size <= res && res < size + mult);
+ return res;
+}
+
+/** @internal Compute the allocation size for an lru_item. */
+static uint item_size(const struct lru *lru, uint key_len, uint val_len)
+{
+ uint key_end = offsetof(struct lru_item, data) + key_len;
+ return key_end + (lru->val_alignment - 1) + val_len;
+ /* ^^^ worst-case padding length
+ * Well, we might compute the bound a bit more precisely,
+ * as we know that lru_item will get alignment at least
+ * some sizeof(void*) and we know all the lengths,
+ * but let's not complicate it, as the gain would be small anyway. */
+}
+
+/** @internal Return pointer to value in an lru_item. */
+static void * item_val(const struct lru *lru, struct lru_item *it)
+{
+ size_t key_end = it->data + it->key_len - (char *)NULL;
+ size_t val_begin = round_power(key_end, lru->val_alignment);
+ return (char *)NULL + val_begin;
+}
+
+/** @internal Free each item. */
+KR_EXPORT void lru_free_items_impl(struct lru *lru)
+{
+ assert(lru);
+ for (size_t i = 0; i < (1 << (size_t)lru->log_groups); ++i) {
+ lru_group_t *g = &lru->groups[i];
+ for (int j = 0; j < LRU_ASSOC; ++j)
+ mm_free(lru->mm, g->items[j]);
+ }
+}
+
+/** @internal See lru_apply. */
+KR_EXPORT void lru_apply_impl(struct lru *lru, lru_apply_fun f, void *baton)
+{
+ bool ok = lru && f;
+ if (!ok) {
+ assert(false);
+ return;
+ }
+ for (size_t i = 0; i < (1 << (size_t)lru->log_groups); ++i) {
+ lru_group_t *g = &lru->groups[i];
+ for (uint j = 0; j < LRU_ASSOC; ++j) {
+ struct lru_item *it = g->items[j];
+ if (!it)
+ continue;
+ enum lru_apply_do ret =
+ f(it->data, it->key_len, item_val(lru, it), baton);
+ switch(ret) {
+ case LRU_APPLY_DO_EVICT: // evict
+ mm_free(lru->mm, it);
+ g->items[j] = NULL;
+ g->counts[j] = 0;
+ g->hashes[j] = 0;
+ break;
+ default:
+ assert(ret == LRU_APPLY_DO_NOTHING);
+ }
+ }
+ }
+}
+
+/** @internal See lru_create. */
+KR_EXPORT struct lru * lru_create_impl(uint max_slots, uint val_alignment,
+ knot_mm_t *mm_array, knot_mm_t *mm)
+{
+ assert(max_slots && __builtin_popcount(val_alignment) == 1);
+ if (!max_slots)
+ return NULL;
+ // let lru->log_groups = ceil(log2(max_slots / (float) assoc))
+ // without trying for efficiency
+ uint group_count = (max_slots - 1) / LRU_ASSOC + 1;
+ uint log_groups = 0;
+ for (uint s = group_count - 1; s; s /= 2)
+ ++log_groups;
+ group_count = 1 << log_groups;
+ assert(max_slots <= group_count * LRU_ASSOC && group_count * LRU_ASSOC < 2 * max_slots);
+
+ /* Get a sufficiently aligning mm_array if NULL is passed. */
+ if (!mm_array) {
+ static knot_mm_t mm_array_default = { 0 };
+ if (!mm_array_default.ctx)
+ mm_ctx_init_aligned(&mm_array_default, alignof(struct lru));
+ mm_array = &mm_array_default;
+ }
+ assert(mm_array->alloc && mm_array->alloc != (knot_mm_alloc_t)mp_alloc);
+
+ size_t size = offsetof(struct lru, groups[group_count]);
+ struct lru *lru = mm_alloc(mm_array, size);
+ if (unlikely(lru == NULL))
+ return NULL;
+ *lru = (struct lru){
+ .mm = mm,
+ .mm_array = mm_array,
+ .log_groups = log_groups,
+ .val_alignment = val_alignment,
+ };
+ // zeros are a good init
+ memset(lru->groups, 0, size - offsetof(struct lru, groups));
+ return lru;
+}
+
+/** @internal Decrement all counters within a group. */
+static void group_dec_counts(lru_group_t *g) {
+ g->counts[LRU_TRACKED] = LRU_TRACKED;
+ for (uint i = 0; i < LRU_TRACKED + 1; ++i)
+ if (likely(g->counts[i]))
+ --g->counts[i];
+}
+
+/** @internal Increment a counter within a group. */
+static void group_inc_count(lru_group_t *g, int i) {
+ if (likely(++(g->counts[i])))
+ return;
+ g->counts[i] = -1;
+ // We could've decreased or halved all of them, but let's keep the max.
+}
+
+/** @internal Implementation of both getting and insertion.
+ * Note: val_len is only meaningful if do_insert.
+ * *is_new is only meaningful when return value isn't NULL, contains
+ * true when returned lru entry has been allocated right now
+ * if return value is NULL, *is_new remains untouched.
+ */
+KR_EXPORT void * lru_get_impl(struct lru *lru, const char *key, uint key_len,
+ uint val_len, bool do_insert, bool *is_new)
+{
+ bool ok = lru && (key || !key_len) && key_len <= UINT16_MAX
+ && (!do_insert || val_len <= UINT16_MAX);
+ if (!ok) {
+ assert(false);
+ return NULL; // reasonable fallback when not debugging
+ }
+ bool is_new_entry = false;
+ // find the right group
+ uint32_t khash = hash(key, key_len);
+ uint16_t khash_top = khash >> 16;
+ lru_group_t *g = &lru->groups[khash & ((1 << lru->log_groups) - 1)];
+ struct lru_item *it = NULL;
+ uint i;
+ // scan the *stored* elements in the group
+ for (i = 0; i < LRU_ASSOC; ++i) {
+ if (g->hashes[i] == khash_top) {
+ it = g->items[i];
+ if (likely(it && it->key_len == key_len
+ && (key_len == 0 || memcmp(it->data, key, key_len) == 0))) {
+ /* Found a key, but trying to insert a value larger than available
+ * space in the allocated slot, so the entry must be resized to fit. */
+ if (unlikely(do_insert && val_len > it->val_len)) {
+ goto insert;
+ } else {
+ goto found; // to reduce huge nesting depth
+ }
+ }
+ }
+ }
+ // key not found; first try an empty/counted-out place to insert
+ if (do_insert)
+ for (i = 0; i < LRU_ASSOC; ++i)
+ if (g->items[i] == NULL || g->counts[i] == 0)
+ goto insert;
+ // check if we track key's count at least
+ for (i = LRU_ASSOC; i < LRU_TRACKED; ++i) {
+ if (g->hashes[i] == khash_top) {
+ group_inc_count(g, i);
+ if (!do_insert)
+ return NULL;
+ // check if we trumped some stored key
+ for (uint j = 0; j < LRU_ASSOC; ++j)
+ if (unlikely(g->counts[i] > g->counts[j])) {
+ // evict key j, i.e. swap with i
+ --g->counts[i]; // we increment it below
+ SWAP(g->counts[i], g->counts[j]);
+ SWAP(g->hashes[i], g->hashes[j]);
+ i = j;
+ goto insert;
+ }
+ return NULL;
+ }
+ }
+ // not found at all: decrement all counts but only on every LRU_TRACKED occasion
+ if (g->counts[LRU_TRACKED])
+ --g->counts[LRU_TRACKED];
+ else
+ group_dec_counts(g);
+ return NULL;
+insert: // insert into position i (incl. key)
+ assert(i < LRU_ASSOC);
+ g->hashes[i] = khash_top;
+ it = g->items[i];
+ uint new_size = item_size(lru, key_len, val_len);
+ if (it == NULL || new_size != item_size(lru, it->key_len, it->val_len)) {
+ // (re)allocate
+ mm_free(lru->mm, it);
+ it = g->items[i] = mm_alloc(lru->mm, new_size);
+ if (it == NULL)
+ return NULL;
+ }
+ it->key_len = key_len;
+ it->val_len = val_len;
+ if (key_len > 0) {
+ memcpy(it->data, key, key_len);
+ }
+ memset(item_val(lru, it), 0, val_len); // clear the value
+ is_new_entry = true;
+found: // key and hash OK on g->items[i]; now update stamps
+ assert(i < LRU_ASSOC);
+ group_inc_count(g, i);
+ if (is_new) {
+ *is_new = is_new_entry;
+ }
+ return item_val(lru, g->items[i]);
+}
+