Fix: pass private data to context callbacks
[lttng-ust.git] / liblttng-ust / rculfhash-mm-chunk.c
CommitLineData
10544ee8 1/*
c0c0989a 2 * SPDX-License-Identifier: LGPL-2.1-or-later
10544ee8 3 *
c0c0989a 4 * Copyright 2011 Lai Jiangshan <laijs@cn.fujitsu.com>
10544ee8 5 *
c0c0989a 6 * Chunk based memory management for Lock-Free RCU Hash Table
10544ee8
MD
7 */
8
9#include <stddef.h>
10#include "rculfhash-internal.h"
11
12static
13void lttng_ust_lfht_alloc_bucket_table(struct lttng_ust_lfht *ht, unsigned long order)
14{
15 if (order == 0) {
16 ht->tbl_chunk[0] = calloc(ht->min_nr_alloc_buckets,
17 sizeof(struct lttng_ust_lfht_node));
18 assert(ht->tbl_chunk[0]);
19 } else if (order > ht->min_alloc_buckets_order) {
20 unsigned long i, len = 1UL << (order - 1 - ht->min_alloc_buckets_order);
21
22 for (i = len; i < 2 * len; i++) {
23 ht->tbl_chunk[i] = calloc(ht->min_nr_alloc_buckets,
24 sizeof(struct lttng_ust_lfht_node));
25 assert(ht->tbl_chunk[i]);
26 }
27 }
28 /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */
29}
30
31/*
32 * lttng_ust_lfht_free_bucket_table() should be called with decreasing order.
33 * When lttng_ust_lfht_free_bucket_table(0) is called, it means the whole
34 * lfht is destroyed.
35 */
36static
37void lttng_ust_lfht_free_bucket_table(struct lttng_ust_lfht *ht, unsigned long order)
38{
39 if (order == 0)
40 poison_free(ht->tbl_chunk[0]);
41 else if (order > ht->min_alloc_buckets_order) {
42 unsigned long i, len = 1UL << (order - 1 - ht->min_alloc_buckets_order);
43
44 for (i = len; i < 2 * len; i++)
45 poison_free(ht->tbl_chunk[i]);
46 }
47 /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */
48}
49
50static
51struct lttng_ust_lfht_node *bucket_at(struct lttng_ust_lfht *ht, unsigned long index)
52{
53 unsigned long chunk, offset;
54
55 chunk = index >> ht->min_alloc_buckets_order;
56 offset = index & (ht->min_nr_alloc_buckets - 1);
57 return &ht->tbl_chunk[chunk][offset];
58}
59
60static
61struct lttng_ust_lfht *alloc_lttng_ust_lfht(unsigned long min_nr_alloc_buckets,
62 unsigned long max_nr_buckets)
63{
64 unsigned long nr_chunks, lttng_ust_lfht_size;
65
66 min_nr_alloc_buckets = max(min_nr_alloc_buckets,
67 max_nr_buckets / MAX_CHUNK_TABLE);
68 nr_chunks = max_nr_buckets / min_nr_alloc_buckets;
69 lttng_ust_lfht_size = offsetof(struct lttng_ust_lfht, tbl_chunk) +
70 sizeof(struct lttng_ust_lfht_node *) * nr_chunks;
71 lttng_ust_lfht_size = max(lttng_ust_lfht_size, sizeof(struct lttng_ust_lfht));
72
73 return __default_alloc_lttng_ust_lfht(
74 &lttng_ust_lfht_mm_chunk, lttng_ust_lfht_size,
75 min_nr_alloc_buckets, max_nr_buckets);
76}
77
78const struct lttng_ust_lfht_mm_type lttng_ust_lfht_mm_chunk = {
79 .alloc_lttng_ust_lfht = alloc_lttng_ust_lfht,
80 .alloc_bucket_table = lttng_ust_lfht_alloc_bucket_table,
81 .free_bucket_table = lttng_ust_lfht_free_bucket_table,
82 .bucket_at = bucket_at,
83};
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