262 lines
7.0 KiB
C
262 lines
7.0 KiB
C
#include "jemalloc/internal/jemalloc_preamble.h"
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#include "jemalloc/internal/jemalloc_internal_includes.h"
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#include "jemalloc/internal/assert.h"
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#include "jemalloc/internal/mutex.h"
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/*
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* Only the most significant bits of keys passed to rtree_{read,write}() are
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* used.
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*/
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bool
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rtree_new(rtree_t *rtree, base_t *base, bool zeroed) {
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#ifdef JEMALLOC_JET
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if (!zeroed) {
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memset(rtree, 0, sizeof(rtree_t)); /* Clear root. */
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}
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#else
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assert(zeroed);
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#endif
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rtree->base = base;
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if (malloc_mutex_init(&rtree->init_lock, "rtree", WITNESS_RANK_RTREE,
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malloc_mutex_rank_exclusive)) {
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return true;
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}
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return false;
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}
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static rtree_node_elm_t *
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rtree_node_alloc(tsdn_t *tsdn, rtree_t *rtree, size_t nelms) {
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return (rtree_node_elm_t *)base_alloc(tsdn, rtree->base,
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nelms * sizeof(rtree_node_elm_t), CACHELINE);
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}
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static rtree_leaf_elm_t *
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rtree_leaf_alloc(tsdn_t *tsdn, rtree_t *rtree, size_t nelms) {
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return (rtree_leaf_elm_t *)base_alloc(tsdn, rtree->base,
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nelms * sizeof(rtree_leaf_elm_t), CACHELINE);
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}
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static rtree_node_elm_t *
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rtree_node_init(tsdn_t *tsdn, rtree_t *rtree, unsigned level,
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atomic_p_t *elmp) {
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malloc_mutex_lock(tsdn, &rtree->init_lock);
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/*
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* If *elmp is non-null, then it was initialized with the init lock
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* held, so we can get by with 'relaxed' here.
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*/
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rtree_node_elm_t *node = atomic_load_p(elmp, ATOMIC_RELAXED);
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if (node == NULL) {
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node = rtree_node_alloc(tsdn, rtree, ZU(1) <<
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rtree_levels[level].bits);
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if (node == NULL) {
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malloc_mutex_unlock(tsdn, &rtree->init_lock);
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return NULL;
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}
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/*
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* Even though we hold the lock, a later reader might not; we
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* need release semantics.
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*/
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atomic_store_p(elmp, node, ATOMIC_RELEASE);
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}
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malloc_mutex_unlock(tsdn, &rtree->init_lock);
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return node;
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}
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static rtree_leaf_elm_t *
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rtree_leaf_init(tsdn_t *tsdn, rtree_t *rtree, atomic_p_t *elmp) {
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malloc_mutex_lock(tsdn, &rtree->init_lock);
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/*
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* If *elmp is non-null, then it was initialized with the init lock
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* held, so we can get by with 'relaxed' here.
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*/
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rtree_leaf_elm_t *leaf = atomic_load_p(elmp, ATOMIC_RELAXED);
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if (leaf == NULL) {
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leaf = rtree_leaf_alloc(tsdn, rtree, ZU(1) <<
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rtree_levels[RTREE_HEIGHT-1].bits);
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if (leaf == NULL) {
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malloc_mutex_unlock(tsdn, &rtree->init_lock);
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return NULL;
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}
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/*
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* Even though we hold the lock, a later reader might not; we
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* need release semantics.
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*/
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atomic_store_p(elmp, leaf, ATOMIC_RELEASE);
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}
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malloc_mutex_unlock(tsdn, &rtree->init_lock);
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return leaf;
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}
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static bool
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rtree_node_valid(rtree_node_elm_t *node) {
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return ((uintptr_t)node != (uintptr_t)0);
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}
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static bool
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rtree_leaf_valid(rtree_leaf_elm_t *leaf) {
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return ((uintptr_t)leaf != (uintptr_t)0);
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}
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static rtree_node_elm_t *
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rtree_child_node_tryread(rtree_node_elm_t *elm, bool dependent) {
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rtree_node_elm_t *node;
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if (dependent) {
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node = (rtree_node_elm_t *)atomic_load_p(&elm->child,
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ATOMIC_RELAXED);
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} else {
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node = (rtree_node_elm_t *)atomic_load_p(&elm->child,
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ATOMIC_ACQUIRE);
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}
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assert(!dependent || node != NULL);
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return node;
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}
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static rtree_node_elm_t *
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rtree_child_node_read(tsdn_t *tsdn, rtree_t *rtree, rtree_node_elm_t *elm,
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unsigned level, bool dependent) {
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rtree_node_elm_t *node;
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node = rtree_child_node_tryread(elm, dependent);
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if (!dependent && unlikely(!rtree_node_valid(node))) {
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node = rtree_node_init(tsdn, rtree, level + 1, &elm->child);
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}
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assert(!dependent || node != NULL);
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return node;
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}
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static rtree_leaf_elm_t *
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rtree_child_leaf_tryread(rtree_node_elm_t *elm, bool dependent) {
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rtree_leaf_elm_t *leaf;
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if (dependent) {
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leaf = (rtree_leaf_elm_t *)atomic_load_p(&elm->child,
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ATOMIC_RELAXED);
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} else {
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leaf = (rtree_leaf_elm_t *)atomic_load_p(&elm->child,
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ATOMIC_ACQUIRE);
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}
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assert(!dependent || leaf != NULL);
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return leaf;
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}
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static rtree_leaf_elm_t *
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rtree_child_leaf_read(tsdn_t *tsdn, rtree_t *rtree, rtree_node_elm_t *elm,
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unsigned level, bool dependent) {
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rtree_leaf_elm_t *leaf;
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leaf = rtree_child_leaf_tryread(elm, dependent);
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if (!dependent && unlikely(!rtree_leaf_valid(leaf))) {
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leaf = rtree_leaf_init(tsdn, rtree, &elm->child);
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}
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assert(!dependent || leaf != NULL);
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return leaf;
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}
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rtree_leaf_elm_t *
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rtree_leaf_elm_lookup_hard(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
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uintptr_t key, bool dependent, bool init_missing) {
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rtree_node_elm_t *node;
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rtree_leaf_elm_t *leaf;
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#if RTREE_HEIGHT > 1
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node = rtree->root;
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#else
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leaf = rtree->root;
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#endif
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if (config_debug) {
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uintptr_t leafkey = rtree_leafkey(key);
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for (unsigned i = 0; i < RTREE_CTX_NCACHE; i++) {
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assert(rtree_ctx->cache[i].leafkey != leafkey);
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}
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for (unsigned i = 0; i < RTREE_CTX_NCACHE_L2; i++) {
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assert(rtree_ctx->l2_cache[i].leafkey != leafkey);
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}
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}
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#define RTREE_GET_CHILD(level) { \
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assert(level < RTREE_HEIGHT-1); \
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if (level != 0 && !dependent && \
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unlikely(!rtree_node_valid(node))) { \
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return NULL; \
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} \
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uintptr_t subkey = rtree_subkey(key, level); \
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if (level + 2 < RTREE_HEIGHT) { \
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node = init_missing ? \
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rtree_child_node_read(tsdn, rtree, \
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&node[subkey], level, dependent) : \
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rtree_child_node_tryread(&node[subkey], \
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dependent); \
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} else { \
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leaf = init_missing ? \
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rtree_child_leaf_read(tsdn, rtree, \
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&node[subkey], level, dependent) : \
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rtree_child_leaf_tryread(&node[subkey], \
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dependent); \
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} \
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}
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/*
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* Cache replacement upon hard lookup (i.e. L1 & L2 rtree cache miss):
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* (1) evict last entry in L2 cache; (2) move the collision slot from L1
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* cache down to L2; and 3) fill L1.
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*/
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#define RTREE_GET_LEAF(level) { \
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assert(level == RTREE_HEIGHT-1); \
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if (!dependent && unlikely(!rtree_leaf_valid(leaf))) { \
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return NULL; \
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} \
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if (RTREE_CTX_NCACHE_L2 > 1) { \
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memmove(&rtree_ctx->l2_cache[1], \
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&rtree_ctx->l2_cache[0], \
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sizeof(rtree_ctx_cache_elm_t) * \
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(RTREE_CTX_NCACHE_L2 - 1)); \
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} \
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size_t slot = rtree_cache_direct_map(key); \
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rtree_ctx->l2_cache[0].leafkey = \
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rtree_ctx->cache[slot].leafkey; \
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rtree_ctx->l2_cache[0].leaf = \
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rtree_ctx->cache[slot].leaf; \
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uintptr_t leafkey = rtree_leafkey(key); \
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rtree_ctx->cache[slot].leafkey = leafkey; \
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rtree_ctx->cache[slot].leaf = leaf; \
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uintptr_t subkey = rtree_subkey(key, level); \
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return &leaf[subkey]; \
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}
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if (RTREE_HEIGHT > 1) {
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RTREE_GET_CHILD(0)
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}
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if (RTREE_HEIGHT > 2) {
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RTREE_GET_CHILD(1)
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}
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if (RTREE_HEIGHT > 3) {
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for (unsigned i = 2; i < RTREE_HEIGHT-1; i++) {
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RTREE_GET_CHILD(i)
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}
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}
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RTREE_GET_LEAF(RTREE_HEIGHT-1)
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#undef RTREE_GET_CHILD
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#undef RTREE_GET_LEAF
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not_reached();
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}
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void
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rtree_ctx_data_init(rtree_ctx_t *ctx) {
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for (unsigned i = 0; i < RTREE_CTX_NCACHE; i++) {
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rtree_ctx_cache_elm_t *cache = &ctx->cache[i];
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cache->leafkey = RTREE_LEAFKEY_INVALID;
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cache->leaf = NULL;
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}
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for (unsigned i = 0; i < RTREE_CTX_NCACHE_L2; i++) {
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rtree_ctx_cache_elm_t *cache = &ctx->l2_cache[i];
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cache->leafkey = RTREE_LEAFKEY_INVALID;
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cache->leaf = NULL;
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}
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}
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