linux-kernel - [PATCH 2/2] mm/vmalloc.c: record the allocator in page_owner when __vmalloc_area_node complete mapping pages to virtual address

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Date:   Tue, 22 Mar 2022 11:22:25 +0800
From:   Yinan Zhang <zhangyinan2019@...il.szu.edu.cn>
To:     akpm@...ux-foundation.org
Cc:     willy@...radead.org, vbabka@...e.cz, william.kucharski@...cle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        yejiajian2018@...il.szu.edu.cn, hanshenghong2019@...il.szu.edu.cn,
        caoyixuan2019@...il.szu.edu.cn, zhaochongxi2019@...il.szu.edu.cn,
        yuhongf@....edu.cn, Yinan Zhang <zhangyinan2019@...il.szu.edu.cn>
Subject: [PATCH 2/2] mm/vmalloc.c: record the allocator in page_owner when __vmalloc_area_node complete mapping pages to virtual address

page owner is for the tracking about who allocated each page.
Recording the allocator in page_owner requires support from vmalloc.

When __vmalloc_area_node complete mapping pages to virtual address,
it means that the memory allocation is successful. At this time,
call set_page_owner_allocator() to record the
allocator (in this patch, it's vmalloc) in page_owner.

This work is coauthored by
	Shenghong Han
	Yixuan Cao
	Chongxi Zhao
	Jiajian Ye
	Yuhong Feng
	Yongqiang Liu

Signed-off-by: Yinan Zhang <zhangyinan2019@...il.szu.edu.cn>
---
 mm/vmalloc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b454cf1a261f..c561d40a3f95 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -40,6 +40,7 @@
 #include <linux/uaccess.h>
 #include <linux/hugetlb.h>
 #include <linux/sched/mm.h>
+#include <linux/page_owner.h>
 #include <asm/tlbflush.h>
 #include <asm/shmparam.h>
 
@@ -3051,6 +3052,13 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 		goto fail;
 	}
 
+#ifdef CONFIG_PAGE_OWNER
+	int i;
+
+	for (i = 0; i < area->nr_pages; i++)
+		set_page_owner_allocator(area->pages[i], 0, PAGE_OWNER_ALLOCATOR_VMALLOC);
+#endif
+
 	return area->addr;
 
 fail:
-- 
2.25.1