Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page

From: Vlastimil Babka
Date: Mon Sep 09 2019 - 08:59:17 EST

On 9/9/19 10:53 AM, Walter Wu wrote:
KASAN will record last stack of page in order to help programmer
to see memory corruption caused by page.

What is difference between page_owner and our patch?
page_owner records alloc stack of page, but our patch is to record
last stack(it may be alloc or free stack of page).

Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>

There's no point in separating this from patch 2 (and as David pointed out, doesn't compile).

mm/page_ext.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/mm/page_ext.c b/mm/page_ext.c
index 5f5769c7db3b..7ca33dcd9ffa 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -65,6 +65,9 @@ static struct page_ext_operations *page_ext_ops[] = {
#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
+ &page_stack_ops,
static unsigned long total_usage;