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1 #include "test/jemalloc_test.h"
2 
3 #include "jemalloc/internal/spin.h"
4 
5 static unsigned		arena_ind;
6 static size_t		sz;
7 static size_t		esz;
8 #define NEPOCHS		8
9 #define PER_THD_NALLOCS	1
10 static atomic_u_t	epoch;
11 static atomic_u_t	nfinished;
12 
13 static unsigned
do_arena_create(extent_hooks_t * h)14 do_arena_create(extent_hooks_t *h) {
15 	unsigned arena_ind;
16 	size_t sz = sizeof(unsigned);
17 	assert_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz,
18 	    (void *)(h != NULL ? &h : NULL), (h != NULL ? sizeof(h) : 0)), 0,
19 	    "Unexpected mallctl() failure");
20 	return arena_ind;
21 }
22 
23 static void
do_arena_destroy(unsigned arena_ind)24 do_arena_destroy(unsigned arena_ind) {
25 	size_t mib[3];
26 	size_t miblen;
27 
28 	miblen = sizeof(mib)/sizeof(size_t);
29 	assert_d_eq(mallctlnametomib("arena.0.destroy", mib, &miblen), 0,
30 	    "Unexpected mallctlnametomib() failure");
31 	mib[1] = (size_t)arena_ind;
32 	assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, NULL, 0), 0,
33 	    "Unexpected mallctlbymib() failure");
34 }
35 
36 static void
do_refresh(void)37 do_refresh(void) {
38 	uint64_t epoch = 1;
39 	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
40 	    sizeof(epoch)), 0, "Unexpected mallctl() failure");
41 }
42 
43 static size_t
do_get_size_impl(const char * cmd,unsigned arena_ind)44 do_get_size_impl(const char *cmd, unsigned arena_ind) {
45 	size_t mib[4];
46 	size_t miblen = sizeof(mib) / sizeof(size_t);
47 	size_t z = sizeof(size_t);
48 
49 	assert_d_eq(mallctlnametomib(cmd, mib, &miblen),
50 	    0, "Unexpected mallctlnametomib(\"%s\", ...) failure", cmd);
51 	mib[2] = arena_ind;
52 	size_t size;
53 	assert_d_eq(mallctlbymib(mib, miblen, (void *)&size, &z, NULL, 0),
54 	    0, "Unexpected mallctlbymib([\"%s\"], ...) failure", cmd);
55 
56 	return size;
57 }
58 
59 static size_t
do_get_active(unsigned arena_ind)60 do_get_active(unsigned arena_ind) {
61 	return do_get_size_impl("stats.arenas.0.pactive", arena_ind) * PAGE;
62 }
63 
64 static size_t
do_get_mapped(unsigned arena_ind)65 do_get_mapped(unsigned arena_ind) {
66 	return do_get_size_impl("stats.arenas.0.mapped", arena_ind);
67 }
68 
69 static void *
thd_start(void * arg)70 thd_start(void *arg) {
71 	for (unsigned next_epoch = 1; next_epoch < NEPOCHS; next_epoch++) {
72 		/* Busy-wait for next epoch. */
73 		unsigned cur_epoch;
74 		spin_t spinner = SPIN_INITIALIZER;
75 		while ((cur_epoch = atomic_load_u(&epoch, ATOMIC_ACQUIRE)) !=
76 		    next_epoch) {
77 			spin_adaptive(&spinner);
78 		}
79 		assert_u_eq(cur_epoch, next_epoch, "Unexpected epoch");
80 
81 		/*
82 		 * Allocate.  The main thread will reset the arena, so there's
83 		 * no need to deallocate.
84 		 */
85 		for (unsigned i = 0; i < PER_THD_NALLOCS; i++) {
86 			void *p = mallocx(sz, MALLOCX_ARENA(arena_ind) |
87 			    MALLOCX_TCACHE_NONE
88 			    );
89 			assert_ptr_not_null(p,
90 			    "Unexpected mallocx() failure\n");
91 		}
92 
93 		/* Let the main thread know we've finished this iteration. */
94 		atomic_fetch_add_u(&nfinished, 1, ATOMIC_RELEASE);
95 	}
96 
97 	return NULL;
98 }
99 
TEST_BEGIN(test_retained)100 TEST_BEGIN(test_retained) {
101 	test_skip_if(!config_stats);
102 
103 	arena_ind = do_arena_create(NULL);
104 	sz = nallocx(HUGEPAGE, 0);
105 	esz = sz + sz_large_pad;
106 
107 	atomic_store_u(&epoch, 0, ATOMIC_RELAXED);
108 
109 	unsigned nthreads = ncpus * 2;
110 	VARIABLE_ARRAY(thd_t, threads, nthreads);
111 	for (unsigned i = 0; i < nthreads; i++) {
112 		thd_create(&threads[i], thd_start, NULL);
113 	}
114 
115 	for (unsigned e = 1; e < NEPOCHS; e++) {
116 		atomic_store_u(&nfinished, 0, ATOMIC_RELEASE);
117 		atomic_store_u(&epoch, e, ATOMIC_RELEASE);
118 
119 		/* Wait for threads to finish allocating. */
120 		spin_t spinner = SPIN_INITIALIZER;
121 		while (atomic_load_u(&nfinished, ATOMIC_ACQUIRE) < nthreads) {
122 			spin_adaptive(&spinner);
123 		}
124 
125 		/*
126 		 * Assert that retained is no more than the sum of size classes
127 		 * that should have been used to satisfy the worker threads'
128 		 * requests, discounting per growth fragmentation.
129 		 */
130 		do_refresh();
131 
132 		size_t allocated = esz * nthreads * PER_THD_NALLOCS;
133 		size_t active = do_get_active(arena_ind);
134 		assert_zu_le(allocated, active, "Unexpected active memory");
135 		size_t mapped = do_get_mapped(arena_ind);
136 		assert_zu_le(active, mapped, "Unexpected mapped memory");
137 
138 		arena_t *arena = arena_get(tsdn_fetch(), arena_ind, false);
139 		size_t usable = 0;
140 		size_t fragmented = 0;
141 		for (pszind_t pind = sz_psz2ind(HUGEPAGE); pind <
142 		    arena->extent_grow_next; pind++) {
143 			size_t psz = sz_pind2sz(pind);
144 			size_t psz_fragmented = psz % esz;
145 			size_t psz_usable = psz - psz_fragmented;
146 			/*
147 			 * Only consider size classes that wouldn't be skipped.
148 			 */
149 			if (psz_usable > 0) {
150 				assert_zu_lt(usable, allocated,
151 				    "Excessive retained memory "
152 				    "(%#zx[+%#zx] > %#zx)", usable, psz_usable,
153 				    allocated);
154 				fragmented += psz_fragmented;
155 				usable += psz_usable;
156 			}
157 		}
158 
159 		/*
160 		 * Clean up arena.  Destroying and recreating the arena
161 		 * is simpler that specifying extent hooks that deallocate
162 		 * (rather than retaining) during reset.
163 		 */
164 		do_arena_destroy(arena_ind);
165 		assert_u_eq(do_arena_create(NULL), arena_ind,
166 		    "Unexpected arena index");
167 	}
168 
169 	for (unsigned i = 0; i < nthreads; i++) {
170 		thd_join(threads[i], NULL);
171 	}
172 
173 	do_arena_destroy(arena_ind);
174 }
175 TEST_END
176 
177 int
main(void)178 main(void) {
179 	return test(
180 	    test_retained);
181 }
182