[RFC PATCH v2 16/16] mm: Release resources when the page alloc hogger module exits

[Juan Yescas <jyescas@google.com>]

When the page alloc hogger module exits:

- free all the previously allocated pages
- Erase all the entries from the xarray

Signed-off-by: Juan Yescas <jyescas@google.com>
---

Changes in v2:
	- Refactor the exit method.
	- Release the page_alloc object.

 mm/page_alloc_hogger.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/page_alloc_hogger.c b/mm/page_alloc_hogger.c
index 6a6fbb78513a..72c0505a6f5a 100644
--- a/mm/page_alloc_hogger.c
+++ b/mm/page_alloc_hogger.c
@@ -591,6 +591,12 @@ static int __init page_alloc_hogger_debugfs_init(void)
 
 static void __exit page_alloc_hogger_debugfs_exit(void)
 {
+	struct page_alloc *pa;
+	unsigned long idx;
+
+	xa_for_each(&allocs_xa, idx, pa)
+		free_alloc_helper(idx);
+
 	debugfs_remove_recursive(mmdir);
 	kmem_cache_destroy(req_alloc_cache);
 	kmem_cache_destroy(page_alloc_cache);
-- 
2.55.0.629.g250fe7f194-goog