/* * Mark a page as having seen activity. * * inactive,unreferenced -> inactive,referenced * inactive,referenced -> active,unreferenced * active,unreferenced -> active,referenced * * When a newly allocated page is not yet visible, so safe for non-atomic ops, * __SetPageReferenced(page) may be substituted for mark_page_accessed(page). */ void mark_page_accessed(struct page *page) { page = compound_head(page); if (!PageActive(page) && !PageUnevictable(page) && PageReferenced(page)) { /* * If the page is on the LRU, queue it for activation via * activate_page_pvecs. Otherwise, assume the page is on a * pagevec, mark it active and it'll be moved to the active * LRU on the next drain. */ if (PageLRU(page)) activate_page(page); else __lru_cache_activate_page(page); ClearPageReferenced(page); if (page_is_file_cache(page)) workingset_activation(page); } else if (!PageReferenced(page)) { SetPageReferenced(page); } if (page_is_idle(page)) clear_page_idle(page); }
u64 stable_page_flags(struct page *page) { u64 k; u64 u; /* * pseudo flag: KPF_NOPAGE * it differentiates a memory hole from a page with no flags */ if (!page) return 1 << KPF_NOPAGE; k = page->flags; u = 0; /* * pseudo flags for the well known (anonymous) memory mapped pages * * Note that page->_mapcount is overloaded in SLOB/SLUB/SLQB, so the * simple test in page_mapcount() is not enough. */ if (!PageSlab(page) && page_mapcount(page)) u |= 1 << KPF_MMAP; if (PageAnon(page)) u |= 1 << KPF_ANON; if (PageKsm(page)) u |= 1 << KPF_KSM; /* * compound pages: export both head/tail info * they together define a compound page's start/end pos and order */ if (PageHead(page)) u |= 1 << KPF_COMPOUND_HEAD; if (PageTail(page)) u |= 1 << KPF_COMPOUND_TAIL; if (PageHuge(page)) u |= 1 << KPF_HUGE; /* * PageTransCompound can be true for non-huge compound pages (slab * pages or pages allocated by drivers with __GFP_COMP) because it * just checks PG_head/PG_tail, so we need to check PageLRU/PageAnon * to make sure a given page is a thp, not a non-huge compound page. */ else if (PageTransCompound(page)) { struct page *head = compound_head(page); if (PageLRU(head) || PageAnon(head)) u |= 1 << KPF_THP; else if (is_huge_zero_page(head)) { u |= 1 << KPF_ZERO_PAGE; u |= 1 << KPF_THP; } } else if (is_zero_pfn(page_to_pfn(page))) u |= 1 << KPF_ZERO_PAGE; /* * Caveats on high order pages: page->_count will only be set * -1 on the head page; SLUB/SLQB do the same for PG_slab; * SLOB won't set PG_slab at all on compound pages. */ if (PageBuddy(page)) u |= 1 << KPF_BUDDY; if (PageBalloon(page)) u |= 1 << KPF_BALLOON; if (page_is_idle(page)) u |= 1 << KPF_IDLE; u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked); u |= kpf_copy_bit(k, KPF_SLAB, PG_slab); u |= kpf_copy_bit(k, KPF_ERROR, PG_error); u |= kpf_copy_bit(k, KPF_DIRTY, PG_dirty); u |= kpf_copy_bit(k, KPF_UPTODATE, PG_uptodate); u |= kpf_copy_bit(k, KPF_WRITEBACK, PG_writeback); u |= kpf_copy_bit(k, KPF_LRU, PG_lru); u |= kpf_copy_bit(k, KPF_REFERENCED, PG_referenced); u |= kpf_copy_bit(k, KPF_ACTIVE, PG_active); u |= kpf_copy_bit(k, KPF_RECLAIM, PG_reclaim); u |= kpf_copy_bit(k, KPF_SWAPCACHE, PG_swapcache); u |= kpf_copy_bit(k, KPF_SWAPBACKED, PG_swapbacked); u |= kpf_copy_bit(k, KPF_UNEVICTABLE, PG_unevictable); u |= kpf_copy_bit(k, KPF_MLOCKED, PG_mlocked); #ifdef CONFIG_MEMORY_FAILURE u |= kpf_copy_bit(k, KPF_HWPOISON, PG_hwpoison); #endif #ifdef CONFIG_ARCH_USES_PG_UNCACHED u |= kpf_copy_bit(k, KPF_UNCACHED, PG_uncached); #endif u |= kpf_copy_bit(k, KPF_RESERVED, PG_reserved); u |= kpf_copy_bit(k, KPF_MAPPEDTODISK, PG_mappedtodisk); u |= kpf_copy_bit(k, KPF_PRIVATE, PG_private); u |= kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2); u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1); u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1); return u; };