add configuration for frequency of guard slabs
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4ee12e64e0
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348f9fa557
2
config.h
2
config.h
@ -3,11 +3,11 @@
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#include <stdbool.h>
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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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#define ZERO_ON_FREE true
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#define SLAB_CANARY true
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#define GUARD_SLABS_INTERVAL 1
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#define GUARD_SIZE_DIVISOR 2
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#endif
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5
malloc.c
5
malloc.c
@ -141,6 +141,7 @@ static struct size_class {
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struct random_state rng;
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size_t metadata_allocated;
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size_t metadata_count;
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size_t metadata_count_unguarded;
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} __attribute__((aligned(CACHELINE_SIZE))) size_class_metadata[N_SIZE_CLASSES];
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static const size_t class_region_size = 128ULL * 1024 * 1024 * 1024;
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@ -180,8 +181,10 @@ static struct slab_metadata *alloc_metadata(struct size_class *c, size_t slab_si
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return NULL;
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}
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c->metadata_count++;
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if (GUARD_SLABS) {
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c->metadata_count_unguarded++;
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if (c->metadata_count_unguarded >= GUARD_SLABS_INTERVAL) {
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c->metadata_count++;
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c->metadata_count_unguarded = 0;
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}
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return metadata;
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}
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