diff options
Diffstat (limited to 'mm/damon/ops-common.c')
| -rw-r--r-- | mm/damon/ops-common.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c index d25d99cb5f2b..0db1fc70c84d 100644 --- a/mm/damon/ops-common.c +++ b/mm/damon/ops-common.c @@ -9,6 +9,8 @@ #include <linux/page_idle.h> #include <linux/pagemap.h> #include <linux/rmap.h> +#include <linux/swap.h> +#include <linux/swapops.h> #include "ops-common.h" @@ -24,7 +26,7 @@ struct folio *damon_get_folio(unsigned long pfn) struct page *page = pfn_to_online_page(pfn); struct folio *folio; - if (!page || PageTail(page)) + if (!page) return NULL; folio = page_folio(page); @@ -39,12 +41,29 @@ struct folio *damon_get_folio(unsigned long pfn) void damon_ptep_mkold(pte_t *pte, struct vm_area_struct *vma, unsigned long addr) { - struct folio *folio = damon_get_folio(pte_pfn(ptep_get(pte))); + pte_t pteval = ptep_get(pte); + struct folio *folio; + bool young = false; + unsigned long pfn; + + if (likely(pte_present(pteval))) + pfn = pte_pfn(pteval); + else + pfn = swp_offset_pfn(pte_to_swp_entry(pteval)); + folio = damon_get_folio(pfn); if (!folio) return; - if (ptep_clear_young_notify(vma, addr, pte)) + /* + * PFN swap PTEs, such as device-exclusive ones, that actually map pages + * are "old" from a CPU perspective. The MMU notifier takes care of any + * device aspects. + */ + if (likely(pte_present(pteval))) + young |= ptep_test_and_clear_young(vma, addr, pte); + young |= mmu_notifier_clear_young(vma->vm_mm, addr, addr + PAGE_SIZE); + if (young) folio_set_young(folio); folio_set_idle(folio); |