From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Subject: mm/swap: implement workingset detection for anonymous LRU This patch implements workingset detection for anonymous LRU. All the infrastructure is implemented by the previous patches so this patch just activates the workingset detection by installing/retrieving the shadow entry and adding refault calculation. Link: http://lkml.kernel.org/r/1595490560-15117-6-git-send-email-iamjoonsoo.kim@xxxxxxx Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/swap.h | 6 ++++++ mm/memory.c | 11 ++++------- mm/swap_state.c | 23 ++++++++++++++++++----- mm/vmscan.c | 7 ++++--- mm/workingset.c | 15 +++++++++++---- 5 files changed, 43 insertions(+), 19 deletions(-) --- a/include/linux/swap.h~mm-swap-implement-workingset-detection-for-anonymous-lru +++ a/include/linux/swap.h @@ -414,6 +414,7 @@ extern struct address_space *swapper_spa extern unsigned long total_swapcache_pages(void); extern void show_swap_cache_info(void); extern int add_to_swap(struct page *page); +extern void *get_shadow_from_swap_cache(swp_entry_t entry); extern int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp, void **shadowp); extern void __delete_from_swap_cache(struct page *page, @@ -573,6 +574,11 @@ static inline int add_to_swap(struct pag return 0; } +static inline void *get_shadow_from_swap_cache(swp_entry_t entry) +{ + return NULL; +} + static inline int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask, void **shadowp) { --- a/mm/memory.c~mm-swap-implement-workingset-detection-for-anonymous-lru +++ a/mm/memory.c @@ -3098,6 +3098,7 @@ vm_fault_t do_swap_page(struct vm_fault int locked; int exclusive = 0; vm_fault_t ret = 0; + void *shadow = NULL; if (!pte_unmap_same(vma->vm_mm, vmf->pmd, vmf->pte, vmf->orig_pte)) goto out; @@ -3149,13 +3150,9 @@ vm_fault_t do_swap_page(struct vm_fault goto out_page; } - /* - * XXX: Move to lru_cache_add() when it - * supports new vs putback - */ - spin_lock_irq(&page_pgdat(page)->lru_lock); - lru_note_cost_page(page); - spin_unlock_irq(&page_pgdat(page)->lru_lock); + shadow = get_shadow_from_swap_cache(entry); + if (shadow) + workingset_refault(page, shadow); lru_cache_add(page); swap_readpage(page, true); --- a/mm/swap_state.c~mm-swap-implement-workingset-detection-for-anonymous-lru +++ a/mm/swap_state.c @@ -106,6 +106,20 @@ void show_swap_cache_info(void) printk("Total swap = %lukB\n", total_swap_pages << (PAGE_SHIFT - 10)); } +void *get_shadow_from_swap_cache(swp_entry_t entry) +{ + struct address_space *address_space = swap_address_space(entry); + pgoff_t idx = swp_offset(entry); + struct page *page; + + page = find_get_entry(address_space, idx); + if (xa_is_value(page)) + return page; + if (page) + put_page(page); + return NULL; +} + /* * add_to_swap_cache resembles add_to_page_cache_locked on swapper_space, * but sets SwapCache flag and private instead of mapping and index. @@ -406,6 +420,7 @@ struct page *__read_swap_cache_async(swp { struct swap_info_struct *si; struct page *page; + void *shadow = NULL; *new_page_allocated = false; @@ -474,7 +489,7 @@ struct page *__read_swap_cache_async(swp __SetPageSwapBacked(page); /* May fail (-ENOMEM) if XArray node allocation failed. */ - if (add_to_swap_cache(page, entry, gfp_mask & GFP_RECLAIM_MASK, NULL)) { + if (add_to_swap_cache(page, entry, gfp_mask & GFP_RECLAIM_MASK, &shadow)) { put_swap_page(page, entry); goto fail_unlock; } @@ -484,10 +499,8 @@ struct page *__read_swap_cache_async(swp goto fail_unlock; } - /* XXX: Move to lru_cache_add() when it supports new vs putback */ - spin_lock_irq(&page_pgdat(page)->lru_lock); - lru_note_cost_page(page); - spin_unlock_irq(&page_pgdat(page)->lru_lock); + if (shadow) + workingset_refault(page, shadow); /* Caller will initiate read into locked page */ SetPageWorkingset(page); --- a/mm/vmscan.c~mm-swap-implement-workingset-detection-for-anonymous-lru +++ a/mm/vmscan.c @@ -854,6 +854,7 @@ static int __remove_mapping(struct addre { unsigned long flags; int refcount; + void *shadow = NULL; BUG_ON(!PageLocked(page)); BUG_ON(mapping != page_mapping(page)); @@ -896,13 +897,13 @@ static int __remove_mapping(struct addre if (PageSwapCache(page)) { swp_entry_t swap = { .val = page_private(page) }; mem_cgroup_swapout(page, swap); - __delete_from_swap_cache(page, swap, NULL); + if (reclaimed && !mapping_exiting(mapping)) + shadow = workingset_eviction(page, target_memcg); + __delete_from_swap_cache(page, swap, shadow); xa_unlock_irqrestore(&mapping->i_pages, flags); put_swap_page(page, swap); - workingset_eviction(page, target_memcg); } else { void (*freepage)(struct page *); - void *shadow = NULL; freepage = mapping->a_ops->freepage; /* --- a/mm/workingset.c~mm-swap-implement-workingset-detection-for-anonymous-lru +++ a/mm/workingset.c @@ -353,15 +353,22 @@ void workingset_refault(struct page *pag /* * Compare the distance to the existing workingset size. We * don't activate pages that couldn't stay resident even if - * all the memory was available to the page cache. Whether - * cache can compete with anon or not depends on having swap. + * all the memory was available to the workingset. Whether + * workingset competition needs to consider anon or not depends + * on having swap. */ workingset_size = lruvec_page_state(eviction_lruvec, NR_ACTIVE_FILE); - if (mem_cgroup_get_nr_swap_pages(memcg) > 0) { + if (!file) { workingset_size += lruvec_page_state(eviction_lruvec, - NR_INACTIVE_ANON); + NR_INACTIVE_FILE); + } + if (mem_cgroup_get_nr_swap_pages(memcg) > 0) { workingset_size += lruvec_page_state(eviction_lruvec, NR_ACTIVE_ANON); + if (file) { + workingset_size += lruvec_page_state(eviction_lruvec, + NR_INACTIVE_ANON); + } } if (refault_distance > workingset_size) goto out; _
