1 #define JEMALLOC_HUGE_C_
2 #include "jemalloc/internal/jemalloc_internal.h"
4 /******************************************************************************/
11 malloc_mutex_t huge_mtx;
13 /******************************************************************************/
15 /* Tree of chunks that are stand-alone huge allocations. */
16 static extent_tree_t huge;
19 huge_malloc(size_t size, bool zero)
22 return (huge_palloc(size, chunksize, zero));
26 huge_palloc(size_t size, size_t alignment, bool zero)
33 /* Allocate one or more contiguous chunks for this request. */
35 csize = CHUNK_CEILING(size);
37 /* size is large enough to cause size_t wrap-around. */
41 /* Allocate an extent node with which to track the chunk. */
42 node = base_node_alloc();
47 * Copy zero into is_zeroed and pass the copy to chunk_alloc(), so that
48 * it is possible to make correct junk/zero fill decisions below.
51 ret = chunk_alloc(csize, alignment, false, &is_zeroed);
53 base_node_dealloc(node);
57 /* Insert node into huge. */
61 malloc_mutex_lock(&huge_mtx);
62 extent_tree_ad_insert(&huge, node);
64 stats_cactive_add(csize);
66 huge_allocated += csize;
68 malloc_mutex_unlock(&huge_mtx);
70 if (config_fill && zero == false) {
72 memset(ret, 0xa5, csize);
73 else if (opt_zero && is_zeroed == false)
74 memset(ret, 0, csize);
81 huge_ralloc_no_move(void *ptr, size_t oldsize, size_t size, size_t extra)
85 * Avoid moving the allocation if the size class can be left the same.
87 if (oldsize > arena_maxclass
88 && CHUNK_CEILING(oldsize) >= CHUNK_CEILING(size)
89 && CHUNK_CEILING(oldsize) <= CHUNK_CEILING(size+extra)) {
90 assert(CHUNK_CEILING(oldsize) == oldsize);
91 if (config_fill && opt_junk && size < oldsize) {
92 memset((void *)((uintptr_t)ptr + size), 0x5a,
98 /* Reallocation would require a move. */
103 huge_ralloc(void *ptr, size_t oldsize, size_t size, size_t extra,
104 size_t alignment, bool zero)
109 /* Try to avoid moving the allocation. */
110 ret = huge_ralloc_no_move(ptr, oldsize, size, extra);
115 * size and oldsize are different enough that we need to use a
116 * different size class. In that case, fall back to allocating new
119 if (alignment > chunksize)
120 ret = huge_palloc(size + extra, alignment, zero);
122 ret = huge_malloc(size + extra, zero);
127 /* Try again, this time without extra. */
128 if (alignment > chunksize)
129 ret = huge_palloc(size, alignment, zero);
131 ret = huge_malloc(size, zero);
138 * Copy at most size bytes (not size+extra), since the caller has no
139 * expectation that the extra bytes will be reliably preserved.
141 copysize = (size < oldsize) ? size : oldsize;
143 #ifdef JEMALLOC_MREMAP
145 * Use mremap(2) if this is a huge-->huge reallocation, and neither the
146 * source nor the destination are in dss.
148 if (oldsize >= chunksize && (config_dss == false || (chunk_in_dss(ptr)
149 == false && chunk_in_dss(ret) == false))) {
150 size_t newsize = huge_salloc(ret);
153 * Remove ptr from the tree of huge allocations before
154 * performing the remap operation, in order to avoid the
155 * possibility of another thread acquiring that mapping before
156 * this one removes it from the tree.
158 huge_dalloc(ptr, false);
159 if (mremap(ptr, oldsize, newsize, MREMAP_MAYMOVE|MREMAP_FIXED,
160 ret) == MAP_FAILED) {
162 * Assuming no chunk management bugs in the allocator,
163 * the only documented way an error can occur here is
164 * if the application changed the map type for a
165 * portion of the old allocation. This is firmly in
166 * undefined behavior territory, so write a diagnostic
167 * message, and optionally abort.
169 char buf[BUFERROR_BUF];
171 buferror(buf, sizeof(buf));
172 malloc_printf("<jemalloc>: Error in mremap(): %s\n",
176 memcpy(ret, ptr, copysize);
177 chunk_dealloc_mmap(ptr, oldsize);
182 memcpy(ret, ptr, copysize);
189 huge_dalloc(void *ptr, bool unmap)
191 extent_node_t *node, key;
193 malloc_mutex_lock(&huge_mtx);
195 /* Extract from tree of huge allocations. */
197 node = extent_tree_ad_search(&huge, &key);
198 assert(node != NULL);
199 assert(node->addr == ptr);
200 extent_tree_ad_remove(&huge, node);
203 stats_cactive_sub(node->size);
205 huge_allocated -= node->size;
208 malloc_mutex_unlock(&huge_mtx);
210 if (unmap && config_fill && config_dss && opt_junk)
211 memset(node->addr, 0x5a, node->size);
213 chunk_dealloc(node->addr, node->size, unmap);
215 base_node_dealloc(node);
219 huge_salloc(const void *ptr)
222 extent_node_t *node, key;
224 malloc_mutex_lock(&huge_mtx);
226 /* Extract from tree of huge allocations. */
227 key.addr = __DECONST(void *, ptr);
228 node = extent_tree_ad_search(&huge, &key);
229 assert(node != NULL);
233 malloc_mutex_unlock(&huge_mtx);
239 huge_prof_ctx_get(const void *ptr)
242 extent_node_t *node, key;
244 malloc_mutex_lock(&huge_mtx);
246 /* Extract from tree of huge allocations. */
247 key.addr = __DECONST(void *, ptr);
248 node = extent_tree_ad_search(&huge, &key);
249 assert(node != NULL);
251 ret = node->prof_ctx;
253 malloc_mutex_unlock(&huge_mtx);
259 huge_prof_ctx_set(const void *ptr, prof_ctx_t *ctx)
261 extent_node_t *node, key;
263 malloc_mutex_lock(&huge_mtx);
265 /* Extract from tree of huge allocations. */
266 key.addr = __DECONST(void *, ptr);
267 node = extent_tree_ad_search(&huge, &key);
268 assert(node != NULL);
270 node->prof_ctx = ctx;
272 malloc_mutex_unlock(&huge_mtx);
279 /* Initialize chunks data. */
280 if (malloc_mutex_init(&huge_mtx))
282 extent_tree_ad_new(&huge);
297 malloc_mutex_prefork(&huge_mtx);
301 huge_postfork_parent(void)
304 malloc_mutex_postfork_parent(&huge_mtx);
308 huge_postfork_child(void)
311 malloc_mutex_postfork_child(&huge_mtx);