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vm: optimise page array size and initialisation.

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* the page array now only extends up to the last non-reserved memory frame.
* rather than memset'ing the whole array to zero, we only initialise p_flags
  for each page in vm_page_array_init, and then leave it to group_pages_into_block
  to initialise the other parts of vm_page_t.
This commit is contained in:
max 🍓
2023-02-07 15:58:37 +00:00
parent 51ad3d48fd
commit 9879bbf646
2 changed files with 16 additions and 10 deletions
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14
vm/page.c
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@@ -69,7 +69,7 @@ void vm_page_init_array()
size_t pmem_size = 0;
memblock_iter_t it;
for_each_mem_range (&it, 0x0, UINTPTR_MAX) {
for_each_free_mem_range (&it, 0x0, UINTPTR_MAX) {
if (pmem_size < it.it_limit + 1) {
pmem_size = it.it_limit + 1;
}
@@ -83,18 +83,18 @@ void vm_page_init_array()
page_array = memblock_alloc(sizeof(vm_page_t) * nr_pages, 8);
page_array_count = nr_pages;
size_t nr_reserved = nr_pages;
for (size_t i = 0; i < nr_pages; i++) {
memset(&page_array[i], 0x0, sizeof page_array[i]);
page_array[i].p_flags = VM_PAGE_RESERVED;
}
size_t nr_reserved = 0;
for_each_reserved_mem_range(&it, 0x0, UINTPTR_MAX) {
for_each_free_mem_range(&it, 0x0, UINTPTR_MAX) {
for (uintptr_t i = it.it_base; i < it.it_limit; i += VM_PAGE_SIZE) {
size_t pfn = i / VM_PAGE_SIZE;
page_array[pfn].p_flags |= VM_PAGE_RESERVED;
nr_reserved++;
page_array[pfn].p_flags = 0;
nr_reserved--;
}
}