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Add a fast path to page table fork

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Chen Chengjun 2024-08-29 11:52:33 +08:00 committed by Tate, Hongliang Tian
parent ba884127e2
commit 00d9b01d5c
1 changed files with 10 additions and 1 deletions
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11
ostd/src/mm/page_table/node.rs
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@ -355,17 +355,22 @@ where
debug_assert!(deep.end <= shallow.start || deep.start >= shallow.end);
let mut new_pt = Self::alloc(self.level());
let mut copied_child_count = self.nr_children();
for i in deep {
if copied_child_count == 0 {
return new_pt;
}
match self.child(i, true) {
Child::PageTable(pt) => {
let guard = pt.clone_shallow().lock();
let new_child = guard.make_copy(0..nr_subpage_per_huge::<C>(), 0..0);
new_pt.set_child_pt(i, new_child.into_raw(), true);
copied_child_count -= 1;
}
Child::Page(page) => {
let prop = self.read_pte_prop(i);
new_pt.set_child_page(i, page.clone(), prop);
copied_child_count -= 1;
}
Child::None => {}
Child::Untracked(_) => {
@ -375,10 +380,14 @@ where
}
for i in shallow {
if copied_child_count == 0 {
return new_pt;
}
debug_assert_eq!(self.level(), C::NR_LEVELS);
match self.child(i, /*meaningless*/ true) {
Child::PageTable(pt) => {
new_pt.set_child_pt(i, pt.clone_shallow(), /*meaningless*/ true);
copied_child_count -= 1;
}
Child::None => {}
Child::Page(_) | Child::Untracked(_) => {