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mm/swap: implement workingset detection for anonymous LRU

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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;