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sandbox: vm: implement page freeing; merge/split bugfix

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This commit is contained in:
max 🍓
2023-02-01 17:05:14 +00:00
parent ca92093c10
commit 9409ebbb19
4 changed files with 91 additions and 21 deletions
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25
sandbox/vm/zone.c
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@@ -184,7 +184,7 @@ static int replenish_free_page_list(vm_zone_t *z, vm_page_order_t order)
queue_push_back(&z->z_free_pages[order - 1], &a->p_free_list);
queue_push_back(&z->z_free_pages[order - 1], &b->p_free_list);
return 0;
}
@@ -194,13 +194,32 @@ vm_page_t *vm_zone_alloc_page(vm_zone_t *z, vm_page_order_t order, vm_flags_t fl
if (result != 0) {
return NULL;
}
queue_entry_t *pg_entry = queue_pop_front(&z->z_free_pages[order]);
return QUEUE_CONTAINER(vm_page_t, p_free_list, pg_entry);
vm_page_t *pg = QUEUE_CONTAINER(vm_page_t, p_free_list, pg_entry);
vm_page_foreach (pg, i) {
i->p_flags |= VM_PAGE_ALLOC;
}
return pg;
}
void vm_zone_free_page(vm_zone_t *z, vm_page_t *pg)
{
pg->p_flags &= ~VM_PAGE_ALLOC;
queue_push_back(&z->z_free_pages[pg->p_order], &pg->p_free_list);
while (1) {
vm_page_t *buddy = vm_page_get_buddy(pg);
vm_page_t *huge = vm_page_merge(pg, buddy);
if (!huge) {
break;
}
queue_delete(&z->z_free_pages[buddy->p_order - 1], &buddy->p_free_list);
queue_delete(&z->z_free_pages[buddy->p_order - 1], &pg->p_free_list);
queue_push_back(&z->z_free_pages[huge->p_order], &huge->p_free_list);
pg = huge;
}
}