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Use node::Entry to optimize page table cursor operations

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This commit is contained in:
Zhang Junyang
2024-10-03 02:11:07 +08:00
committed by Tate, Hongliang Tian
parent 96f120d957
commit e1e7afe0ca
6 changed files with 516 additions and 415 deletions
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13
ostd/src/mm/page_table/mod.rs
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@ -100,7 +100,7 @@ impl PageTable<KernelMode> {
/// This should be the only way to create the user page table, that is to
/// duplicate the kernel page table with all the kernel mappings shared.
pub fn create_user_page_table(&self) -> PageTable<UserMode> {
let root_node = self.root.clone_shallow().lock();
let mut root_node = self.root.clone_shallow().lock();
let mut new_node =
PageTableNode::alloc(PagingConsts::NR_LEVELS, MapTrackingStatus::NotApplicable);
@ -108,9 +108,9 @@ impl PageTable<KernelMode> {
// The user space range is not copied.
const NR_PTES_PER_NODE: usize = nr_subpage_per_huge::<PagingConsts>();
for i in NR_PTES_PER_NODE / 2..NR_PTES_PER_NODE {
let child = root_node.child(i);
if !child.is_none() {
let _ = new_node.replace_child(i, child);
let root_entry = root_node.entry(i);
if !root_entry.is_none() {
let _ = new_node.entry(i).replace(root_entry.to_owned());
}
}
@ -137,7 +137,8 @@ impl PageTable<KernelMode> {
let mut root_node = self.root.clone_shallow().lock();
for i in start..end {
if !root_node.read_pte(i).is_present() {
let root_entry = root_node.entry(i);
if root_entry.is_none() {
let nxt_level = PagingConsts::NR_LEVELS - 1;
let is_tracked = if super::kspace::should_map_as_tracked(
i * page_size::<PagingConsts>(nxt_level),
@ -147,7 +148,7 @@ impl PageTable<KernelMode> {
MapTrackingStatus::Untracked
};
let node = PageTableNode::alloc(nxt_level, is_tracked);
let _ = root_node.replace_child(i, Child::PageTable(node.into_raw()));
let _ = root_entry.replace(Child::PageTable(node.into_raw()));
}
}
}