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make the memory mapping quarantine more efficient

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This commit is contained in:
Daniel Micay 2018-10-09 14:08:36 -04:00
parent 57d5ab769b
commit ddcdd9423c
1 changed files with 10 additions and 4 deletions
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14
malloc.c
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@ -514,6 +514,11 @@ struct region_info {
size_t guard_size;
};
struct quarantine_info {
void *p;
size_t size;
};
static const size_t initial_region_table_size = 256;
static const size_t max_region_table_size = class_region_size / PAGE_SIZE;
@ -522,7 +527,7 @@ static struct region_info *regions;
static size_t regions_total = initial_region_table_size;
static size_t regions_free = initial_region_table_size;
static struct mutex regions_lock = MUTEX_INITIALIZER;
static struct region_info regions_quarantine[REGION_QUARANTINE_SIZE];
static struct quarantine_info regions_quarantine[REGION_QUARANTINE_SIZE];
static size_t regions_quarantine_index;
static void regions_quarantine_deallocate_pages(void *p, size_t size, size_t guard_size) {
@ -536,11 +541,12 @@ static void regions_quarantine_deallocate_pages(void *p, size_t size, size_t gua
return;
}
struct region_info old = regions_quarantine[regions_quarantine_index];
struct quarantine_info old = regions_quarantine[regions_quarantine_index];
if (old.p != NULL) {
deallocate_pages(old.p, old.size, old.guard_size);
memory_unmap(old.p, old.size);
}
regions_quarantine[regions_quarantine_index] = (struct region_info){p, size, guard_size};
regions_quarantine[regions_quarantine_index] =
(struct quarantine_info){(char *)p - guard_size, size + guard_size * 2};
regions_quarantine_index = (regions_quarantine_index + 1) % REGION_QUARANTINE_SIZE;
}