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mm/zone: defer free slab destruction

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Loïc Grégoire
2026-08-20 21:59:28 -04:00
parent 07b3893859
commit d06351f31c
1 changed files with 19 additions and 3 deletions
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src/mm/zone.zig
+19 -3
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@@ -500,10 +500,12 @@ pub const Zone = struct {
chunk_size: usize, chunk_size: usize,
/// Zone lock. /// Zone lock.
lock: ke.Mutex, lock: ke.Mutex,
/// List of full slabs in this zone. /// List of full slabs (fully allocated) in this zone.
full_slabs: rtl.List, full_slabs: rtl.List,
/// List of partial slabs in this zone. /// List of partial slabs (partially allocated) in this zone.
partial_slabs: rtl.List, partial_slabs: rtl.List,
/// List of free slabs (fully unallocated) in this zone.
free_slabs: rtl.List,
/// Linkage into the global zone list. /// Linkage into the global zone list.
next: ?*Zone, next: ?*Zone,
depot_lock: ke.QSpinLock, depot_lock: ke.QSpinLock,
@@ -559,6 +561,7 @@ pub const Zone = struct {
self.full_slabs.init(); self.full_slabs.init();
self.partial_slabs.init(); self.partial_slabs.init();
self.free_slabs.init();
self.name = name; self.name = name;
self.obj_size = size; self.obj_size = size;
@@ -930,7 +933,7 @@ pub const Zone = struct {
if (slab.refcount == 0) { if (slab.refcount == 0) {
// No more outstanding allocations, it is safe to reclaim the slab. // No more outstanding allocations, it is safe to reclaim the slab.
slab.link.remove(); slab.link.remove();
self.slab_destroy(slab); self.free_slabs.insert_tail(&slab.link);
return; return;
} }
} }
@@ -1066,7 +1069,20 @@ pub const Zone = struct {
self.maglist_destroy(depot.full_mags.head, magazine_size.load()); self.maglist_destroy(depot.full_mags.head, magazine_size.load());
} }
// Destroy all free slabs. Swap the list under the lock.
const head = &self.free_slabs.head;
var entry = self.free_slabs.first();
self.free_slabs.init();
self.lock.release(); self.lock.release();
while (true) {
const slab: *Slab = @fieldParentPtr("link", entry);
const next = entry.next;
self.slab_destroy(slab);
if (next == head) break;
entry = next;
}
} }
/// Called when memory is low and we need to make memory ASAP. /// Called when memory is low and we need to make memory ASAP.