232 lines
6.3 KiB
C
232 lines
6.3 KiB
C
/*
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* util/storage/slabhash.c - hashtable consisting of several smaller tables.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* Implementation of hash table that consists of smaller hash tables.
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* This results in a partitioned lruhash table.
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* It cannot grow, but that gives it the ability to have multiple
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* locks. Also this means there are multiple LRU lists.
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*/
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#include "config.h"
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#include "util/storage/slabhash.h"
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struct slabhash* slabhash_create(size_t numtables, size_t start_size,
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size_t maxmem, lruhash_sizefunc_t sizefunc,
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lruhash_compfunc_t compfunc, lruhash_delkeyfunc_t delkeyfunc,
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lruhash_deldatafunc_t deldatafunc, void* arg)
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{
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size_t i;
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struct slabhash* sl = (struct slabhash*)calloc(1,
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sizeof(struct slabhash));
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if(!sl) return NULL;
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sl->size = numtables;
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log_assert(sl->size > 0);
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sl->array = (struct lruhash**)calloc(sl->size, sizeof(struct lruhash*));
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if(!sl->array) {
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free(sl);
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return NULL;
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}
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sl->mask = (uint32_t)(sl->size - 1);
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if(sl->mask == 0) {
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sl->shift = 0;
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} else {
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log_assert( (sl->size & sl->mask) == 0
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/* size must be power of 2 */ );
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sl->shift = 0;
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while(!(sl->mask & 0x80000000)) {
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sl->mask <<= 1;
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sl->shift ++;
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}
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}
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for(i=0; i<sl->size; i++) {
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sl->array[i] = lruhash_create(start_size, maxmem / sl->size,
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sizefunc, compfunc, delkeyfunc, deldatafunc, arg);
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if(!sl->array[i]) {
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slabhash_delete(sl);
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return NULL;
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}
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}
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return sl;
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}
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void slabhash_delete(struct slabhash* sl)
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{
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if(!sl)
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return;
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if(sl->array) {
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size_t i;
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for(i=0; i<sl->size; i++)
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lruhash_delete(sl->array[i]);
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free(sl->array);
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}
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free(sl);
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}
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void slabhash_clear(struct slabhash* sl)
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{
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size_t i;
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if(!sl)
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return;
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for(i=0; i<sl->size; i++)
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lruhash_clear(sl->array[i]);
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}
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/** helper routine to calculate the slabhash index */
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static unsigned int
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slab_idx(struct slabhash* sl, hashvalue_t hash)
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{
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return ((hash & sl->mask) >> sl->shift);
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}
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void slabhash_insert(struct slabhash* sl, hashvalue_t hash,
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struct lruhash_entry* entry, void* data, void* arg)
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{
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lruhash_insert(sl->array[slab_idx(sl, hash)], hash, entry, data, arg);
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}
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struct lruhash_entry* slabhash_lookup(struct slabhash* sl,
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hashvalue_t hash, void* key, int wr)
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{
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return lruhash_lookup(sl->array[slab_idx(sl, hash)], hash, key, wr);
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}
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void slabhash_remove(struct slabhash* sl, hashvalue_t hash, void* key)
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{
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lruhash_remove(sl->array[slab_idx(sl, hash)], hash, key);
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}
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void slabhash_status(struct slabhash* sl, const char* id, int extended)
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{
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size_t i;
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char num[17];
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log_info("Slabhash %s: %u tables mask=%x shift=%d",
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id, (unsigned)sl->size, (unsigned)sl->mask, sl->shift);
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for(i=0; i<sl->size; i++) {
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snprintf(num, sizeof(num), "table %u", (unsigned)i);
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lruhash_status(sl->array[i], num, extended);
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}
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}
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size_t slabhash_get_size(struct slabhash* sl)
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{
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size_t i, total = 0;
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for(i=0; i<sl->size; i++) {
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lock_quick_lock(&sl->array[i]->lock);
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total += sl->array[i]->space_max;
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lock_quick_unlock(&sl->array[i]->lock);
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}
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return total;
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}
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size_t slabhash_get_mem(struct slabhash* sl)
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{
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size_t i, total = sizeof(*sl);
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total += sizeof(struct lruhash*)*sl->size;
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for(i=0; i<sl->size; i++) {
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total += lruhash_get_mem(sl->array[i]);
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}
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return total;
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}
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struct lruhash* slabhash_gettable(struct slabhash* sl, hashvalue_t hash)
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{
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return sl->array[slab_idx(sl, hash)];
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}
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/* test code, here to avoid linking problems with fptr_wlist */
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/** delete key */
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static void delkey(struct slabhash_testkey* k) {
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lock_rw_destroy(&k->entry.lock); free(k);}
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/** delete data */
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static void deldata(struct slabhash_testdata* d) {free(d);}
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size_t test_slabhash_sizefunc(void* ATTR_UNUSED(key), void* ATTR_UNUSED(data))
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{
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return sizeof(struct slabhash_testkey) +
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sizeof(struct slabhash_testdata);
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}
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int test_slabhash_compfunc(void* key1, void* key2)
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{
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struct slabhash_testkey* k1 = (struct slabhash_testkey*)key1;
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struct slabhash_testkey* k2 = (struct slabhash_testkey*)key2;
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if(k1->id == k2->id)
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return 0;
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if(k1->id > k2->id)
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return 1;
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return -1;
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}
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void test_slabhash_delkey(void* key, void* ATTR_UNUSED(arg))
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{
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delkey((struct slabhash_testkey*)key);
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}
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void test_slabhash_deldata(void* data, void* ATTR_UNUSED(arg))
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{
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deldata((struct slabhash_testdata*)data);
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}
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void slabhash_setmarkdel(struct slabhash* sl, lruhash_markdelfunc_t md)
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{
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size_t i;
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for(i=0; i<sl->size; i++) {
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lruhash_setmarkdel(sl->array[i], md);
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}
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}
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void slabhash_traverse(struct slabhash* sh, int wr,
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void (*func)(struct lruhash_entry*, void*), void* arg)
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{
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size_t i;
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for(i=0; i<sh->size; i++)
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lruhash_traverse(sh->array[i], wr, func, arg);
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}
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size_t count_slabhash_entries(struct slabhash* sh)
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{
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size_t slab, cnt = 0;
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for(slab=0; slab<sh->size; slab++) {
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lock_quick_lock(&sh->array[slab]->lock);
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cnt += sh->array[slab]->num;
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lock_quick_unlock(&sh->array[slab]->lock);
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}
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return cnt;
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}
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