The patch titled
Subject: mm/migrate.c: cplit only transparent huge pages when allocation fails
has been added to the -mm tree. Its filename is
mm-migrate-split-only-transparent-huge-pages-when-allocation-fails.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-migrate-split-only-transparent-huge-pages-when-allocation-fails.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-migrate-split-only-transparent-huge-pages-when-allocation-fails.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/migrate.c: cplit only transparent huge pages when allocation fails
split_huge_page_to_list() fails on HugeTLB pages. I was experimenting
with moving 32MB contig HugeTLB pages on arm64 (with a debug patch
applied) and hit the following stack trace when the kernel crashed.
[ 3732.462797] Call trace:
[ 3732.462835] split_huge_page_to_list+0x3b0/0x858
[ 3732.462913] migrate_pages+0x728/0xc20
[ 3732.462999] soft_offline_page+0x448/0x8b0
[ 3732.463097] __arm64_sys_madvise+0x724/0x850
[ 3732.463197] el0_svc_handler+0x74/0x110
[ 3732.463297] el0_svc+0x8/0xc
[ 3732.463347] Code: d1000400 f90b0e60 f2fbd5a2 a94982a1 (f9000420)
When unmap_and_move[_huge_page]() fails due to lack of memory, the
splitting should happen only for transparent huge pages not for HugeTLB
pages. PageTransHuge() returns true for both THP and HugeTLB pages.
Hence the conditonal check should test PagesHuge() flag to make sure that
given pages is not a HugeTLB one.
Link: http://lkml.kernel.org/r/1537798495-4996-1-git-send-email-anshuman.khandual@xxxxxxx
Fixes: 94723aafb9 ("mm: unclutter THP migration")
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Zi Yan <zi.yan@xxxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/migrate.c~mm-migrate-split-only-transparent-huge-pages-when-allocation-fails
+++ a/mm/migrate.c
@@ -1414,7 +1414,7 @@ retry:
* we encounter them after the rest of the list
* is processed.
*/
- if (PageTransHuge(page)) {
+ if (PageTransHuge(page) && !PageHuge(page)) {
lock_page(page);
rc = split_huge_page_to_list(page, from);
unlock_page(page);
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-migrate-split-only-transparent-huge-pages-when-allocation-fails.patch
