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