1 #define JEMALLOC_QUARANTINE_C_
2 #include "jemalloc/internal/jemalloc_internal.h"
5 * Quarantine pointers close to NULL are used to encode state information that
6 * is used for cleaning up during thread shutdown.
8 #define QUARANTINE_STATE_REINCARNATED ((quarantine_t *)(uintptr_t)1)
9 #define QUARANTINE_STATE_PURGATORY ((quarantine_t *)(uintptr_t)2)
10 #define QUARANTINE_STATE_MAX QUARANTINE_STATE_PURGATORY
12 /******************************************************************************/
13 /* Function prototypes for non-inline static functions. */
15 static quarantine_t *quarantine_grow(tsd_t *tsd, quarantine_t *quarantine);
16 static void quarantine_drain_one(tsd_t *tsd, quarantine_t *quarantine);
17 static void quarantine_drain(tsd_t *tsd, quarantine_t *quarantine,
20 /******************************************************************************/
23 quarantine_init(tsd_t *tsd, size_t lg_maxobjs)
25 quarantine_t *quarantine;
28 assert(tsd_nominal(tsd));
30 size = offsetof(quarantine_t, objs) + ((ZU(1) << lg_maxobjs) *
31 sizeof(quarantine_obj_t));
32 quarantine = (quarantine_t *)iallocztm(tsd, size, size2index(size),
33 false, tcache_get(tsd, true), true, NULL, true);
34 if (quarantine == NULL)
36 quarantine->curbytes = 0;
37 quarantine->curobjs = 0;
38 quarantine->first = 0;
39 quarantine->lg_maxobjs = lg_maxobjs;
45 quarantine_alloc_hook_work(tsd_t *tsd)
47 quarantine_t *quarantine;
49 if (!tsd_nominal(tsd))
52 quarantine = quarantine_init(tsd, LG_MAXOBJS_INIT);
54 * Check again whether quarantine has been initialized, because
55 * quarantine_init() may have triggered recursive initialization.
57 if (tsd_quarantine_get(tsd) == NULL)
58 tsd_quarantine_set(tsd, quarantine);
60 idalloctm(tsd, quarantine, tcache_get(tsd, false), true, true);
64 quarantine_grow(tsd_t *tsd, quarantine_t *quarantine)
68 ret = quarantine_init(tsd, quarantine->lg_maxobjs + 1);
70 quarantine_drain_one(tsd, quarantine);
74 ret->curbytes = quarantine->curbytes;
75 ret->curobjs = quarantine->curobjs;
76 if (quarantine->first + quarantine->curobjs <= (ZU(1) <<
77 quarantine->lg_maxobjs)) {
78 /* objs ring buffer data are contiguous. */
79 memcpy(ret->objs, &quarantine->objs[quarantine->first],
80 quarantine->curobjs * sizeof(quarantine_obj_t));
82 /* objs ring buffer data wrap around. */
83 size_t ncopy_a = (ZU(1) << quarantine->lg_maxobjs) -
85 size_t ncopy_b = quarantine->curobjs - ncopy_a;
87 memcpy(ret->objs, &quarantine->objs[quarantine->first], ncopy_a
88 * sizeof(quarantine_obj_t));
89 memcpy(&ret->objs[ncopy_a], quarantine->objs, ncopy_b *
90 sizeof(quarantine_obj_t));
92 idalloctm(tsd, quarantine, tcache_get(tsd, false), true, true);
94 tsd_quarantine_set(tsd, ret);
99 quarantine_drain_one(tsd_t *tsd, quarantine_t *quarantine)
101 quarantine_obj_t *obj = &quarantine->objs[quarantine->first];
102 assert(obj->usize == isalloc(obj->ptr, config_prof));
103 idalloctm(tsd, obj->ptr, NULL, false, true);
104 quarantine->curbytes -= obj->usize;
105 quarantine->curobjs--;
106 quarantine->first = (quarantine->first + 1) & ((ZU(1) <<
107 quarantine->lg_maxobjs) - 1);
111 quarantine_drain(tsd_t *tsd, quarantine_t *quarantine, size_t upper_bound)
114 while (quarantine->curbytes > upper_bound && quarantine->curobjs > 0)
115 quarantine_drain_one(tsd, quarantine);
119 quarantine(tsd_t *tsd, void *ptr)
121 quarantine_t *quarantine;
122 size_t usize = isalloc(ptr, config_prof);
124 cassert(config_fill);
125 assert(opt_quarantine);
127 if ((quarantine = tsd_quarantine_get(tsd)) == NULL) {
128 idalloctm(tsd, ptr, NULL, false, true);
132 * Drain one or more objects if the quarantine size limit would be
133 * exceeded by appending ptr.
135 if (quarantine->curbytes + usize > opt_quarantine) {
136 size_t upper_bound = (opt_quarantine >= usize) ? opt_quarantine
138 quarantine_drain(tsd, quarantine, upper_bound);
140 /* Grow the quarantine ring buffer if it's full. */
141 if (quarantine->curobjs == (ZU(1) << quarantine->lg_maxobjs))
142 quarantine = quarantine_grow(tsd, quarantine);
143 /* quarantine_grow() must free a slot if it fails to grow. */
144 assert(quarantine->curobjs < (ZU(1) << quarantine->lg_maxobjs));
145 /* Append ptr if its size doesn't exceed the quarantine size. */
146 if (quarantine->curbytes + usize <= opt_quarantine) {
147 size_t offset = (quarantine->first + quarantine->curobjs) &
148 ((ZU(1) << quarantine->lg_maxobjs) - 1);
149 quarantine_obj_t *obj = &quarantine->objs[offset];
152 quarantine->curbytes += usize;
153 quarantine->curobjs++;
154 if (config_fill && unlikely(opt_junk_free)) {
156 * Only do redzone validation if Valgrind isn't in
159 if ((!config_valgrind || likely(!in_valgrind))
160 && usize <= SMALL_MAXCLASS)
161 arena_quarantine_junk_small(ptr, usize);
163 memset(ptr, 0x5a, usize);
166 assert(quarantine->curbytes == 0);
167 idalloctm(tsd, ptr, NULL, false, true);
172 quarantine_cleanup(tsd_t *tsd)
174 quarantine_t *quarantine;
179 quarantine = tsd_quarantine_get(tsd);
180 if (quarantine != NULL) {
181 quarantine_drain(tsd, quarantine, 0);
182 idalloctm(tsd, quarantine, tcache_get(tsd, false), true, true);
183 tsd_quarantine_set(tsd, NULL);