1#define JEMALLOC_LARGE_C_
2#include "jemalloc/internal/jemalloc_preamble.h"
3#include "jemalloc/internal/jemalloc_internal_includes.h"
4
5#include "jemalloc/internal/assert.h"
6#include "jemalloc/internal/extent_mmap.h"
7#include "jemalloc/internal/mutex.h"
8#include "jemalloc/internal/rtree.h"
9#include "jemalloc/internal/util.h"
10
11/******************************************************************************/
12
13void *
14large_malloc(tsdn_t *tsdn, arena_t *arena, size_t usize, bool zero) {
15 assert(usize == sz_s2u(usize));
16
17 return large_palloc(tsdn, arena, usize, CACHELINE, zero);
18}
19
20void *
21large_palloc(tsdn_t *tsdn, arena_t *arena, size_t usize, size_t alignment,
22 bool zero) {
23 size_t ausize;
24 extent_t *extent;
25 bool is_zeroed;
26 UNUSED bool idump JEMALLOC_CC_SILENCE_INIT(false);
27
28 assert(!tsdn_null(tsdn) || arena != NULL);
29
30 ausize = sz_sa2u(usize, alignment);
31 if (unlikely(ausize == 0 || ausize > SC_LARGE_MAXCLASS)) {
32 return NULL;
33 }
34
35 if (config_fill && unlikely(opt_zero)) {
36 zero = true;
37 }
38 /*
39 * Copy zero into is_zeroed and pass the copy when allocating the
40 * extent, so that it is possible to make correct junk/zero fill
41 * decisions below, even if is_zeroed ends up true when zero is false.
42 */
43 is_zeroed = zero;
44 if (likely(!tsdn_null(tsdn))) {
45 arena = arena_choose_maybe_huge(tsdn_tsd(tsdn), arena, usize);
46 }
47 if (unlikely(arena == NULL) || (extent = arena_extent_alloc_large(tsdn,
48 arena, usize, alignment, &is_zeroed)) == NULL) {
49 return NULL;
50 }
51
52 /* See comments in arena_bin_slabs_full_insert(). */
53 if (!arena_is_auto(arena)) {
54 /* Insert extent into large. */
55 malloc_mutex_lock(tsdn, &arena->large_mtx);
56 extent_list_append(&arena->large, extent);
57 malloc_mutex_unlock(tsdn, &arena->large_mtx);
58 }
59 if (config_prof && arena_prof_accum(tsdn, arena, usize)) {
60 prof_idump(tsdn);
61 }
62
63 if (zero) {
64 assert(is_zeroed);
65 } else if (config_fill && unlikely(opt_junk_alloc)) {
66 memset(extent_addr_get(extent), JEMALLOC_ALLOC_JUNK,
67 extent_usize_get(extent));
68 }
69
70 arena_decay_tick(tsdn, arena);
71 return extent_addr_get(extent);
72}
73
74static void
75large_dalloc_junk_impl(void *ptr, size_t size) {
76 memset(ptr, JEMALLOC_FREE_JUNK, size);
77}
78large_dalloc_junk_t *JET_MUTABLE large_dalloc_junk = large_dalloc_junk_impl;
79
80static void
81large_dalloc_maybe_junk_impl(void *ptr, size_t size) {
82 if (config_fill && have_dss && unlikely(opt_junk_free)) {
83 /*
84 * Only bother junk filling if the extent isn't about to be
85 * unmapped.
86 */
87 if (opt_retain || (have_dss && extent_in_dss(ptr))) {
88 large_dalloc_junk(ptr, size);
89 }
90 }
91}
92large_dalloc_maybe_junk_t *JET_MUTABLE large_dalloc_maybe_junk =
93 large_dalloc_maybe_junk_impl;
94
95static bool
96large_ralloc_no_move_shrink(tsdn_t *tsdn, extent_t *extent, size_t usize) {
97 arena_t *arena = extent_arena_get(extent);
98 size_t oldusize = extent_usize_get(extent);
99 extent_hooks_t *extent_hooks = extent_hooks_get(arena);
100 size_t diff = extent_size_get(extent) - (usize + sz_large_pad);
101
102 assert(oldusize > usize);
103
104 if (extent_hooks->split == NULL) {
105 return true;
106 }
107
108 /* Split excess pages. */
109 if (diff != 0) {
110 extent_t *trail = extent_split_wrapper(tsdn, arena,
111 &extent_hooks, extent, usize + sz_large_pad,
112 sz_size2index(usize), false, diff, SC_NSIZES, false);
113 if (trail == NULL) {
114 return true;
115 }
116
117 if (config_fill && unlikely(opt_junk_free)) {
118 large_dalloc_maybe_junk(extent_addr_get(trail),
119 extent_size_get(trail));
120 }
121
122 arena_extents_dirty_dalloc(tsdn, arena, &extent_hooks, trail);
123 }
124
125 arena_extent_ralloc_large_shrink(tsdn, arena, extent, oldusize);
126
127 return false;
128}
129
130static bool
131large_ralloc_no_move_expand(tsdn_t *tsdn, extent_t *extent, size_t usize,
132 bool zero) {
133 arena_t *arena = extent_arena_get(extent);
134 size_t oldusize = extent_usize_get(extent);
135 extent_hooks_t *extent_hooks = extent_hooks_get(arena);
136 size_t trailsize = usize - oldusize;
137
138 if (extent_hooks->merge == NULL) {
139 return true;
140 }
141
142 if (config_fill && unlikely(opt_zero)) {
143 zero = true;
144 }
145 /*
146 * Copy zero into is_zeroed_trail and pass the copy when allocating the
147 * extent, so that it is possible to make correct junk/zero fill
148 * decisions below, even if is_zeroed_trail ends up true when zero is
149 * false.
150 */
151 bool is_zeroed_trail = zero;
152 bool commit = true;
153 extent_t *trail;
154 bool new_mapping;
155 if ((trail = extents_alloc(tsdn, arena, &extent_hooks,
156 &arena->extents_dirty, extent_past_get(extent), trailsize, 0,
157 CACHELINE, false, SC_NSIZES, &is_zeroed_trail, &commit)) != NULL
158 || (trail = extents_alloc(tsdn, arena, &extent_hooks,
159 &arena->extents_muzzy, extent_past_get(extent), trailsize, 0,
160 CACHELINE, false, SC_NSIZES, &is_zeroed_trail, &commit)) != NULL) {
161 if (config_stats) {
162 new_mapping = false;
163 }
164 } else {
165 if ((trail = extent_alloc_wrapper(tsdn, arena, &extent_hooks,
166 extent_past_get(extent), trailsize, 0, CACHELINE, false,
167 SC_NSIZES, &is_zeroed_trail, &commit)) == NULL) {
168 return true;
169 }
170 if (config_stats) {
171 new_mapping = true;
172 }
173 }
174
175 if (extent_merge_wrapper(tsdn, arena, &extent_hooks, extent, trail)) {
176 extent_dalloc_wrapper(tsdn, arena, &extent_hooks, trail);
177 return true;
178 }
179 rtree_ctx_t rtree_ctx_fallback;
180 rtree_ctx_t *rtree_ctx = tsdn_rtree_ctx(tsdn, &rtree_ctx_fallback);
181 szind_t szind = sz_size2index(usize);
182 extent_szind_set(extent, szind);
183 rtree_szind_slab_update(tsdn, &extents_rtree, rtree_ctx,
184 (uintptr_t)extent_addr_get(extent), szind, false);
185
186 if (config_stats && new_mapping) {
187 arena_stats_mapped_add(tsdn, &arena->stats, trailsize);
188 }
189
190 if (zero) {
191 if (config_cache_oblivious) {
192 /*
193 * Zero the trailing bytes of the original allocation's
194 * last page, since they are in an indeterminate state.
195 * There will always be trailing bytes, because ptr's
196 * offset from the beginning of the extent is a multiple
197 * of CACHELINE in [0 .. PAGE).
198 */
199 void *zbase = (void *)
200 ((uintptr_t)extent_addr_get(extent) + oldusize);
201 void *zpast = PAGE_ADDR2BASE((void *)((uintptr_t)zbase +
202 PAGE));
203 size_t nzero = (uintptr_t)zpast - (uintptr_t)zbase;
204 assert(nzero > 0);
205 memset(zbase, 0, nzero);
206 }
207 assert(is_zeroed_trail);
208 } else if (config_fill && unlikely(opt_junk_alloc)) {
209 memset((void *)((uintptr_t)extent_addr_get(extent) + oldusize),
210 JEMALLOC_ALLOC_JUNK, usize - oldusize);
211 }
212
213 arena_extent_ralloc_large_expand(tsdn, arena, extent, oldusize);
214
215 return false;
216}
217
218bool
219large_ralloc_no_move(tsdn_t *tsdn, extent_t *extent, size_t usize_min,
220 size_t usize_max, bool zero) {
221 size_t oldusize = extent_usize_get(extent);
222
223 /* The following should have been caught by callers. */
224 assert(usize_min > 0 && usize_max <= SC_LARGE_MAXCLASS);
225 /* Both allocation sizes must be large to avoid a move. */
226 assert(oldusize >= SC_LARGE_MINCLASS
227 && usize_max >= SC_LARGE_MINCLASS);
228
229 if (usize_max > oldusize) {
230 /* Attempt to expand the allocation in-place. */
231 if (!large_ralloc_no_move_expand(tsdn, extent, usize_max,
232 zero)) {
233 arena_decay_tick(tsdn, extent_arena_get(extent));
234 return false;
235 }
236 /* Try again, this time with usize_min. */
237 if (usize_min < usize_max && usize_min > oldusize &&
238 large_ralloc_no_move_expand(tsdn, extent, usize_min,
239 zero)) {
240 arena_decay_tick(tsdn, extent_arena_get(extent));
241 return false;
242 }
243 }
244
245 /*
246 * Avoid moving the allocation if the existing extent size accommodates
247 * the new size.
248 */
249 if (oldusize >= usize_min && oldusize <= usize_max) {
250 arena_decay_tick(tsdn, extent_arena_get(extent));
251 return false;
252 }
253
254 /* Attempt to shrink the allocation in-place. */
255 if (oldusize > usize_max) {
256 if (!large_ralloc_no_move_shrink(tsdn, extent, usize_max)) {
257 arena_decay_tick(tsdn, extent_arena_get(extent));
258 return false;
259 }
260 }
261 return true;
262}
263
264static void *
265large_ralloc_move_helper(tsdn_t *tsdn, arena_t *arena, size_t usize,
266 size_t alignment, bool zero) {
267 if (alignment <= CACHELINE) {
268 return large_malloc(tsdn, arena, usize, zero);
269 }
270 return large_palloc(tsdn, arena, usize, alignment, zero);
271}
272
273void *
274large_ralloc(tsdn_t *tsdn, arena_t *arena, void *ptr, size_t usize,
275 size_t alignment, bool zero, tcache_t *tcache,
276 hook_ralloc_args_t *hook_args) {
277 extent_t *extent = iealloc(tsdn, ptr);
278
279 size_t oldusize = extent_usize_get(extent);
280 /* The following should have been caught by callers. */
281 assert(usize > 0 && usize <= SC_LARGE_MAXCLASS);
282 /* Both allocation sizes must be large to avoid a move. */
283 assert(oldusize >= SC_LARGE_MINCLASS
284 && usize >= SC_LARGE_MINCLASS);
285
286 /* Try to avoid moving the allocation. */
287 if (!large_ralloc_no_move(tsdn, extent, usize, usize, zero)) {
288 hook_invoke_expand(hook_args->is_realloc
289 ? hook_expand_realloc : hook_expand_rallocx, ptr, oldusize,
290 usize, (uintptr_t)ptr, hook_args->args);
291 return extent_addr_get(extent);
292 }
293
294 /*
295 * usize and old size are different enough that we need to use a
296 * different size class. In that case, fall back to allocating new
297 * space and copying.
298 */
299 void *ret = large_ralloc_move_helper(tsdn, arena, usize, alignment,
300 zero);
301 if (ret == NULL) {
302 return NULL;
303 }
304
305 hook_invoke_alloc(hook_args->is_realloc
306 ? hook_alloc_realloc : hook_alloc_rallocx, ret, (uintptr_t)ret,
307 hook_args->args);
308 hook_invoke_dalloc(hook_args->is_realloc
309 ? hook_dalloc_realloc : hook_dalloc_rallocx, ptr, hook_args->args);
310
311 size_t copysize = (usize < oldusize) ? usize : oldusize;
312 memcpy(ret, extent_addr_get(extent), copysize);
313 isdalloct(tsdn, extent_addr_get(extent), oldusize, tcache, NULL, true);
314 return ret;
315}
316
317/*
318 * junked_locked indicates whether the extent's data have been junk-filled, and
319 * whether the arena's large_mtx is currently held.
320 */
321static void
322large_dalloc_prep_impl(tsdn_t *tsdn, arena_t *arena, extent_t *extent,
323 bool junked_locked) {
324 if (!junked_locked) {
325 /* See comments in arena_bin_slabs_full_insert(). */
326 if (!arena_is_auto(arena)) {
327 malloc_mutex_lock(tsdn, &arena->large_mtx);
328 extent_list_remove(&arena->large, extent);
329 malloc_mutex_unlock(tsdn, &arena->large_mtx);
330 }
331 large_dalloc_maybe_junk(extent_addr_get(extent),
332 extent_usize_get(extent));
333 } else {
334 /* Only hold the large_mtx if necessary. */
335 if (!arena_is_auto(arena)) {
336 malloc_mutex_assert_owner(tsdn, &arena->large_mtx);
337 extent_list_remove(&arena->large, extent);
338 }
339 }
340 arena_extent_dalloc_large_prep(tsdn, arena, extent);
341}
342
343static void
344large_dalloc_finish_impl(tsdn_t *tsdn, arena_t *arena, extent_t *extent) {
345 extent_hooks_t *extent_hooks = EXTENT_HOOKS_INITIALIZER;
346 arena_extents_dirty_dalloc(tsdn, arena, &extent_hooks, extent);
347}
348
349void
350large_dalloc_prep_junked_locked(tsdn_t *tsdn, extent_t *extent) {
351 large_dalloc_prep_impl(tsdn, extent_arena_get(extent), extent, true);
352}
353
354void
355large_dalloc_finish(tsdn_t *tsdn, extent_t *extent) {
356 large_dalloc_finish_impl(tsdn, extent_arena_get(extent), extent);
357}
358
359void
360large_dalloc(tsdn_t *tsdn, extent_t *extent) {
361 arena_t *arena = extent_arena_get(extent);
362 large_dalloc_prep_impl(tsdn, arena, extent, false);
363 large_dalloc_finish_impl(tsdn, arena, extent);
364 arena_decay_tick(tsdn, arena);
365}
366
367size_t
368large_salloc(tsdn_t *tsdn, const extent_t *extent) {
369 return extent_usize_get(extent);
370}
371
372prof_tctx_t *
373large_prof_tctx_get(tsdn_t *tsdn, const extent_t *extent) {
374 return extent_prof_tctx_get(extent);
375}
376
377void
378large_prof_tctx_set(tsdn_t *tsdn, extent_t *extent, prof_tctx_t *tctx) {
379 extent_prof_tctx_set(extent, tctx);
380}
381
382void
383large_prof_tctx_reset(tsdn_t *tsdn, extent_t *extent) {
384 large_prof_tctx_set(tsdn, extent, (prof_tctx_t *)(uintptr_t)1U);
385}
386
387nstime_t
388large_prof_alloc_time_get(const extent_t *extent) {
389 return extent_prof_alloc_time_get(extent);
390}
391
392void
393large_prof_alloc_time_set(extent_t *extent, nstime_t t) {
394 extent_prof_alloc_time_set(extent, t);
395}
396