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SubjectRe: vmscan: Reclaim unevictable pages

Below is the Error Msg :

[ 24.718792] page dumped because: VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page))
[ 24.726949] page->mem_cgroup:bd008c00
[ 24.730693] ------------[ cut here ]------------
[ 24.735304] kernel BUG at mm/vmscan.c:1350!
[ 24.739478] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM

Solved the issue by below patch.

diff --git a/mm/vmscan.c b/mm/vmscan.c
index be56e2e..2e51edc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -990,15 +990,17 @@ static unsigned long shrink_page_list(struct list_head *page_list,
page = lru_to_page(page_list);

if (!trylock_page(page)) {
goto keep;

VM_BUG_ON_PAGE(PageActive(page), page);


if (unlikely(!page_evictable(page)))
- goto activate_locked;
+ goto cull_mlocked;

if (!sc->may_unmap && page_mapped(page))
goto keep_locked;
@@ -1331,6 +1333,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
} else
list_add(&page->lru, &free_pages);
+ if (PageSwapCache(page))
+ try_to_free_swap(page);
+ unlock_page(page);
+ list_add(&page->lru, &ret_pages);
+ continue;

/* Not a candidate for swapping, so reclaim swap space. */

From: Pankaj Suryawanshi
Sent: 14 March 2019 13:23:53
Subject: vmscan: Reclaim unevictable pages

Hello ,

shrink_page_list() returns , number of pages reclaimed, when pages is unevictable it returns VM_BUG_ON_PAGE(PageLRU(page) || PageUnevicatble(page),page);
We can add the unevictable pages in reclaim list in shrink_page_list(), return total number of reclaim pages including unevictable pages, let the caller handle unevictable pages.


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