[PATCH v13 079/137] mm/workingset: Convert workingset_refault() to take a folio

Matthew Wilcox (Oracle)
2021-07-12T03:50:42Z

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>
---
include/linux/swap.h | 4 ++--
mm/filemap.c | 2 +-
mm/memory.c | 3 ++-
mm/swap.c | 7 +++----
mm/swap_state.c | 2 +-
mm/workingset.c | 34 +++++++++++++++++-----------------
6 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index c7a4c0a5863d..5e01675af7ab 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -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 *);
diff --git a/mm/filemap.c b/mm/filemap.c
index b04c91ad294c..b0c9b4030144 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -981,7 +981,7 @@ 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;
diff --git a/mm/memory.c b/mm/memory.c
index 614418e26e2c..627e7836ade6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3538,7 +3538,8 @@ 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);

diff --git a/mm/swap.c b/mm/swap.c
index b49e10e75af5..fe177a16de84 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -315,11 +315,10 @@ 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)
diff --git a/mm/swap_state.c b/mm/swap_state.c
index c56aa9ac050d..1a29b4f98208 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -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);
diff --git a/mm/workingset.c b/mm/workingset.c
index 39bb60d50217..9d86ea344656 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -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
+ * @page: 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;
@@ -301,10 +301,10 @@ void workingset_refault(struct page *page, void *shadow)
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
@@ -340,14 +340,14 @@ 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);
+ memcg = folio_memcg(folio);
lruvec = mem_cgroup_lruvec(memcg, pgdat);

inc_lruvec_state(lruvec, WORKINGSET_REFAULT_BASE + file);
@@ -375,15 +375,15 @@ 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));
+ folio_set_active_flag(folio);
+ workingset_age_nonresident(lruvec, folio_nr_pages(folio));
inc_lruvec_state(lruvec, WORKINGSET_ACTIVATE_BASE + file);

- /* Page was active prior to eviction */
+ /* Folio was active prior to eviction */
if (workingset) {
- SetPageWorkingset(page);
+ folio_set_workingset_flag(folio);
/* XXX: Move to lru_cache_add() when it supports new vs putback */
- lru_note_cost_page(page);
+ lru_note_cost_folio(folio);
inc_lruvec_state(lruvec, WORKINGSET_RESTORE_BASE + file);
}
out:
--
2.30.2