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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.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Link: http://lkml.kernel.org/r/1595490560-15117-6-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2020-08-11 18:30:50 -07:00 committed by Linus Torvalds
parent 3852f6768e
commit aae466b005
5 changed files with 43 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/swap.h
View File

@ -414,6 +414,7 @@ extern struct address_space *swapper_spaces[];
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 page *page)
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)
{

11
mm/memory.c
View File

@ -3098,6 +3098,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
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 *vmf)
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);

23
mm/swap_state.c
View File

@ -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_entry_t entry, gfp_t gfp_mask,
{
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_entry_t entry, gfp_t gfp_mask,
__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_entry_t entry, gfp_t gfp_mask,
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);

7
mm/vmscan.c
View File

@ -854,6 +854,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
{
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 address_space *mapping, struct page *page,
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;
/*

15
mm/workingset.c
View File

@ -353,15 +353,22 @@ void workingset_refault(struct page *page, void *shadow)
/*
* 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 (!file) {
workingset_size += lruvec_page_state(eviction_lruvec,
NR_INACTIVE_FILE);
}
if (mem_cgroup_get_nr_swap_pages(memcg) > 0) {
workingset_size += lruvec_page_state(eviction_lruvec,
NR_INACTIVE_ANON);
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;