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mm/workingset: Convert workingset_refault() to take a folio

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This nets us 178 bytes of savings from removing calls to compound_head.
The three callers all grow a little, but each of them will be converted
to use folios soon, so that's fine.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-04-29 10:27:16 -04:00
parent 9bf70167e3
commit 0995d7e568
7 changed files with 31 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/swap.h
View File

@ -329,7 +329,7 @@ static inline swp_entry_t folio_swap_entry(struct folio *folio)
/* linux/mm/workingset.c */
void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages);
void *workingset_eviction(struct page *page, struct mem_cgroup *target_memcg);
void workingset_refault(struct page *page, void *shadow);
void workingset_refault(struct folio *folio, void *shadow);
void workingset_activation(struct folio *folio);
/* Only track the nodes of mappings with shadow entries */
@ -350,7 +350,7 @@ extern unsigned long nr_free_buffer_pages(void);
/* linux/mm/swap.c */
extern void lru_note_cost(struct lruvec *lruvec, bool file,
unsigned int nr_pages);
extern void lru_note_cost_page(struct page *);
extern void lru_note_cost_folio(struct folio *);
extern void lru_cache_add(struct page *);
void mark_page_accessed(struct page *);
void folio_mark_accessed(struct folio *);

6
include/linux/vmstat.h
View File

@ -597,12 +597,6 @@ static inline void mod_lruvec_page_state(struct page *page,
#endif /* CONFIG_MEMCG */
static inline void inc_lruvec_state(struct lruvec *lruvec,
enum node_stat_item idx)
{
mod_lruvec_state(lruvec, idx, 1);
}
static inline void __inc_lruvec_page_state(struct page *page,
enum node_stat_item idx)
{

2
mm/filemap.c
View File

@ -998,7 +998,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
*/
WARN_ON_ONCE(PageActive(page));
if (!(gfp_mask & __GFP_WRITE) && shadow)
workingset_refault(page, shadow);
workingset_refault(page_folio(page), shadow);
lru_cache_add(page);
}
return ret;

3
mm/memory.c
View File

@ -3539,7 +3539,8 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
shadow = get_shadow_from_swap_cache(entry);
if (shadow)
workingset_refault(page, shadow);
workingset_refault(page_folio(page),
shadow);
lru_cache_add(page);

7
mm/swap.c
View File

@ -293,11 +293,10 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
} while ((lruvec = parent_lruvec(lruvec)));
}
void lru_note_cost_page(struct page *page)
void lru_note_cost_folio(struct folio *folio)
{
struct folio *folio = page_folio(page);
lru_note_cost(folio_lruvec(folio),
page_is_file_lru(page), thp_nr_pages(page));
lru_note_cost(folio_lruvec(folio), folio_is_file_lru(folio),
folio_nr_pages(folio));
}
static void __folio_activate(struct folio *folio, struct lruvec *lruvec)

2
mm/swap_state.c
View File

@ -498,7 +498,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
mem_cgroup_swapin_uncharge_swap(entry);
if (shadow)
workingset_refault(page, shadow);
workingset_refault(page_folio(page), shadow);
/* Caller will initiate read into locked page */
lru_cache_add(page);

42
mm/workingset.c
View File

@ -273,17 +273,17 @@ void *workingset_eviction(struct page *page, struct mem_cgroup *target_memcg)
}
/**
* workingset_refault - evaluate the refault of a previously evicted page
* @page: the freshly allocated replacement page
* @shadow: shadow entry of the evicted page
* workingset_refault - Evaluate the refault of a previously evicted folio.
* @folio: The freshly allocated replacement folio.
* @shadow: Shadow entry of the evicted folio.
*
* Calculates and evaluates the refault distance of the previously
* evicted page in the context of the node and the memcg whose memory
* evicted folio in the context of the node and the memcg whose memory
* pressure caused the eviction.
*/
void workingset_refault(struct page *page, void *shadow)
void workingset_refault(struct folio *folio, void *shadow)
{
bool file = page_is_file_lru(page);
bool file = folio_is_file_lru(folio);
struct mem_cgroup *eviction_memcg;
struct lruvec *eviction_lruvec;
unsigned long refault_distance;
@ -295,16 +295,17 @@ void workingset_refault(struct page *page, void *shadow)
unsigned long refault;
bool workingset;
int memcgid;
long nr;
unpack_shadow(shadow, &memcgid, &pgdat, &eviction, &workingset);
rcu_read_lock();
/*
* Look up the memcg associated with the stored ID. It might
* have been deleted since the page's eviction.
* have been deleted since the folio's eviction.
*
* Note that in rare events the ID could have been recycled
* for a new cgroup that refaults a shared page. This is
* for a new cgroup that refaults a shared folio. This is
* impossible to tell from the available data. However, this
* should be a rare and limited disturbance, and activations
* are always speculative anyway. Ultimately, it's the aging
@ -340,17 +341,18 @@ void workingset_refault(struct page *page, void *shadow)
refault_distance = (refault - eviction) & EVICTION_MASK;
/*
* The activation decision for this page is made at the level
* The activation decision for this folio is made at the level
* where the eviction occurred, as that is where the LRU order
* during page reclaim is being determined.
* during folio reclaim is being determined.
*
* However, the cgroup that will own the page is the one that
* However, the cgroup that will own the folio is the one that
* is actually experiencing the refault event.
*/
memcg = page_memcg(page);
nr = folio_nr_pages(folio);
memcg = folio_memcg(folio);
lruvec = mem_cgroup_lruvec(memcg, pgdat);
inc_lruvec_state(lruvec, WORKINGSET_REFAULT_BASE + file);
mod_lruvec_state(lruvec, WORKINGSET_REFAULT_BASE + file, nr);
mem_cgroup_flush_stats();
/*
@ -376,16 +378,16 @@ void workingset_refault(struct page *page, void *shadow)
if (refault_distance > workingset_size)
goto out;
SetPageActive(page);
workingset_age_nonresident(lruvec, thp_nr_pages(page));
inc_lruvec_state(lruvec, WORKINGSET_ACTIVATE_BASE + file);
folio_set_active(folio);
workingset_age_nonresident(lruvec, nr);
mod_lruvec_state(lruvec, WORKINGSET_ACTIVATE_BASE + file, nr);
/* Page was active prior to eviction */
/* Folio was active prior to eviction */
if (workingset) {
SetPageWorkingset(page);
folio_set_workingset(folio);
/* XXX: Move to lru_cache_add() when it supports new vs putback */
lru_note_cost_page(page);
inc_lruvec_state(lruvec, WORKINGSET_RESTORE_BASE + file);
lru_note_cost_folio(folio);
mod_lruvec_state(lruvec, WORKINGSET_RESTORE_BASE + file, nr);
}
out:
rcu_read_unlock();