Commit 56cde66d authored Mar 07, 2024 by Yuan Can

mm: hugetlb_vmemmap: allow alloc vmemmap pages fallback to other nodes

mainline inclusion
from mainline-v6.7-rc1
commit 6a898c2757af1ac852bb917a0866d2724f303076
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I96CYK
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6a898c2757af1ac852bb917a0866d2724f303076

----------------------------------------------------------------------

In vmemmap_remap_free(), a new head vmemmap page is allocated to avoid
breaking a contiguous block of struct page memory, however, the allocation
can always fail when the given node is movable node.  Remove the
__GFP_THISNODE to help avoid fragmentation.

Link: https://lkml.kernel.org/r/20230906093157.9737-1-yuancan@huawei.com


Signed-off-by: Yuan Can <yuancan@huawei.com>
Suggested-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Suggested-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent a18c9b7d

mm/hugetlb_vmemmap.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -320,8 +320,7 @@ static int vmemmap_remap_free(unsigned long start, unsigned long end,
		.vmemmap_pages = &vmemmap_pages,
		};
		int nid = page_to_nid((struct page *)reuse);
		gfp_t gfp_mask = GFP_KERNEL \| __GFP_THISNODE \| __GFP_NORETRY \|
		__GFP_NOWARN;
		gfp_t gfp_mask = GFP_KERNEL \| __GFP_NORETRY \| __GFP_NOWARN;

		/*
		* Allocate a new head vmemmap page to avoid breaking a contiguous