lkml.org 
[lkml]   [2022]   [Sep]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH] mm: track bad page via kmemleak
Date
From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>

Bad pages will failed go back to allocator and leaved as orphan pages, track
them down via kmemleak.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
mm/page_alloc.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e5486d4..24f682e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1408,7 +1408,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
__memcg_kmem_uncharge_page(page, order);
reset_page_owner(page, order);
page_table_check_free(page, order);
- return false;
+ goto err;
}

/*
@@ -1442,7 +1442,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
if (check_free)
bad += check_free_page(page);
if (bad)
- return false;
+ goto err;

page_cpupid_reset_last(page);
page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
@@ -1486,6 +1486,10 @@ static __always_inline bool free_pages_prepare(struct page *page,
debug_pagealloc_unmap_pages(page, 1 << order);

return true;
+err:
+ kmemleak_alloc(page_address(page), PAGE_SIZE << order, 1, GFP_KERNEL);
+ return false;
+
}

#ifdef CONFIG_DEBUG_VM
--
1.9.1
\
 
 \ /
  Last update: 2022-09-20 15:13    [W:0.035 / U:0.668 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site