Messages in this thread Patch in this message | | | From | Muchun Song <> | Subject | [PATCH v7 06/15] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two | Date | Mon, 30 Nov 2020 23:18:29 +0800 |
| |
We only can free the tail vmemmap pages of HugeTLB to the buddy allocator when the size of struct page is a power of two.
Signed-off-by: Muchun Song <songmuchun@bytedance.com> --- mm/hugetlb_vmemmap.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 51152e258f39..ad8fc61ea273 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -111,6 +111,11 @@ void __init hugetlb_vmemmap_init(struct hstate *h) unsigned int nr_pages = pages_per_huge_page(h); unsigned int vmemmap_pages; + if (!is_power_of_2(sizeof(struct page))) { + pr_info("disable freeing vmemmap pages for %s\n", h->name); + return; + } + vmemmap_pages = (nr_pages * sizeof(struct page)) >> PAGE_SHIFT; /* * The head page and the first tail page are not to be freed to buddy -- 2.11.0
| |