diff options
| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2023-09-13 17:51:24 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-04 10:32:27 -0700 |
| commit | a8ac4a767dcd9d87d8229045904d9fe15ea5e0e8 (patch) | |
| tree | 2618f557f5ad6b556867daafe24fa7bf24c0432e /mm/migrate.c | |
| parent | 09c550508a4b8f7844b197cc16877dd0f7c42d8f (diff) | |
mm: migrate: remove PageTransHuge check in numamigrate_isolate_page()
Patch series "mm: migrate: more folio conversion and unification", v3.
Convert more migrate functions to use a folio, it is also a preparation
for large folio migration support when balancing numa.
This patch (of 8):
The assert VM_BUG_ON_PAGE(order && !PageTransHuge(page), page) is not very
useful,
1) for a tail/base page, order = 0, for a head page, the order > 0 &&
PageTransHuge() is true
2) there is a PageCompound() check and only base page is handled in
do_numa_page(), and do_huge_pmd_numa_page() only handle PMD-mapped
THP
3) even though the page is a tail page, isolate_lru_page() will post
a warning, and fail to isolate the page
4) if large folio/pte-mapped THP migration supported in the future,
we could migrate the entire folio if numa fault on a tail page
so just remove the check.
Link: https://lkml.kernel.org/r/20230913095131.2426871-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20230913095131.2426871-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index eb6bc4053bc4..d1b8ab5a2417 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2486,8 +2486,6 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) int nr_pages = thp_nr_pages(page); int order = compound_order(page); - VM_BUG_ON_PAGE(order && !PageTransHuge(page), page); - /* Do not migrate THP mapped by multiple processes */ if (PageTransHuge(page) && total_mapcount(page) > 1) return 0; |