add slot randomization to configuration header
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1
config.h
1
config.h
@ -3,5 +3,6 @@
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#define GUARD_SLABS true
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#define WRITE_AFTER_FREE_CHECK true
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#define SLOT_RANDOMIZE true
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#endif
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13
malloc.c
13
malloc.c
@ -204,13 +204,16 @@ static size_t get_free_slot(struct random_state *rng, size_t slots, struct slab_
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fatal_error("no zero bits");
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}
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// randomize start location for linear search (uniform random choice is too slow)
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uint64_t random_split = ~(~0UL << get_random_u16_uniform(rng, slots));
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if (SLOT_RANDOMIZE) {
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// randomize start location for linear search (uniform random choice is too slow)
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uint64_t random_split = ~(~0UL << get_random_u16_uniform(rng, slots));
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size_t slot = ffzl(masked | random_split);
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if (slot) {
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return slot - 1;
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size_t slot = ffzl(masked | random_split);
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if (slot) {
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return slot - 1;
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}
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}
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return ffzl(masked) - 1;
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}
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