| From: Zhenneng Li <lizhenneng@kylinos.cn> |
| Subject: migrate_pages: modify max number of pages to migrate in batch |
| Date: Mon, 24 Jun 2024 12:51:20 +0800 |
| |
| We restrict the number of pages to be migrated to no more than |
| HPAGE_PMD_NR or NR_MAX_BATCHED_MIGRATION, but in fact, the number of pages |
| to be migrated may reach 2*HPAGE_PMD_NR-1 or 2 |
| *NR_MAX_BATCHED_MIGRATION-1, it's not in inconsistent with the context. |
| |
| Please refer to commit 42012e0436d4 ("migrate_pages: restrict number of |
| pages to migrate in batch"). |
| |
| Link: https://lkml.kernel.org/r/20240624045120.121261-1-lizhenneng@kylinos.cn |
| Signed-off-by: Zhenneng Li <lizhenneng@kylinos.cn> |
| Cc: "Huang, Ying" <ying.huang@intel.com> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| --- |
| |
| mm/migrate.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/mm/migrate.c~migrate_pages-modify-max-number-of-pages-to-migrate-in-batch |
| +++ a/mm/migrate.c |
| @@ -1961,7 +1961,7 @@ again: |
| break; |
| } |
| if (nr_pages >= NR_MAX_BATCHED_MIGRATION) |
| - list_cut_before(&folios, from, &folio2->lru); |
| + list_cut_before(&folios, from, &folio->lru); |
| else |
| list_splice_init(from, &folios); |
| if (mode == MIGRATE_ASYNC) |
| _ |
