Samuka007/asterinas
1
0
Fork 0
mirror of https://github.com/asterinas/asterinas.git synced 2025-06-27 03:13:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

Implement the stray marking in PT to ensure serializability

Browse Source
This commit is contained in:
Zhang Junyang
2025-03-24 11:58:03 +08:00
committed by Tate, Hongliang Tian
parent 5b7637eac3
commit 54fbdcf059
10 changed files with 167 additions and 126 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
ostd/src/mm/page_table/mod.rs
View File

@ -14,8 +14,6 @@ use super::{
};
use crate::{
arch::mm::{PageTableEntry, PagingConsts},
cpu::PinCurrentCpu,
task::disable_preempt,
util::marker::SameSizeAs,
Pod,
};
@ -23,7 +21,8 @@ use crate::{
mod node;
use node::*;
pub mod cursor;
pub use cursor::{Cursor, CursorMut, PageTableItem};
pub(crate) use cursor::PageTableItem;
pub use cursor::{Cursor, CursorMut};
#[cfg(ktest)]
mod test;
@ -99,25 +98,6 @@ impl PageTable<UserMode> {
self.root.activate();
}
}
/// Clear the page table.
pub(super) fn clear<G: PinCurrentCpu>(&self, flusher: &mut super::tlb::TlbFlusher<'_, G>) {
let _guard = disable_preempt();
let mut root_node = self.root.lock();
const NR_PTES_PER_NODE: usize = nr_subpage_per_huge::<PagingConsts>();
for i in 0..NR_PTES_PER_NODE / 2 {
let mut root_entry = root_node.entry(i);
if !root_entry.is_none() {
let old = root_entry.replace(Child::None);
if let Child::PageTable(pt) = old {
flusher
.issue_tlb_flush_with(crate::mm::tlb::TlbFlushOp::All, pt.clone().into());
// There may be other cursors accessing the old child, delay it with RCU.
let _ = crate::sync::RcuDrop::new(pt);
}
}
}
}
}
impl PageTable<KernelMode> {
@ -171,7 +151,9 @@ impl PageTable<KernelMode> {
};
let pt_cloned = pt.clone();
let _ = new_node.entry(i).replace(Child::PageTable(pt_cloned));
let _ = new_node
.entry(i)
.replace(Child::PageTable(crate::sync::RcuDrop::new(pt_cloned)));
}
drop(new_node);