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mm/zone: free empty slabs on drain()

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Loïc Grégoire
2026-09-07 20:58:14 -04:00
parent 5cb96ec943
commit b5d3c5fdb9
1 changed files with 14 additions and 1 deletions
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src/mm/zone.zig
+14 -1
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@@ -1106,7 +1106,19 @@ pub const Zone = struct {
self.maglist_destroy(depot.empty_mags.head, 0);
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();
while (entry != head) {
const slab: *Slab = @fieldParentPtr("link", entry);
const next = entry.next;
self.slab_destroy(slab);
entry = next;
}
}
fn trim_maglist(self: *Self, maglist: *MagazineList, rounds: usize) void {
@@ -1324,10 +1336,11 @@ pub const Zone = struct {
fn slab_destroy(self: *Self, slab: *Slab) void {
if (self.obj_size > small_slab_size) {
const base = slab.base;
const alloc_size = @sizeOf(Slab) + Slab.bitmap_bytes(slab.capacity);
gpa.free(@as([*]u8, @ptrCast(slab))[0..alloc_size]);
mm.heap.free(slab.base, self.slab_size);
mm.heap.free(base, self.slab_size);
} else {
free_page(@ptrFromInt(
std.mem.alignBackward(usize, @intFromPtr(slab), mm.page_size),