[PATCH v13 082/137] mm/lru: Add folio_add_lru()

Matthew Wilcox (Oracle)
2021-07-12T03:51:55Z

Reimplement lru_cache_add() as a wrapper around folio_add_lru().
Saves 159 bytes of kernel text due to removing calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
include/linux/swap.h | 1 +
mm/folio-compat.c | 6 ++++++
mm/swap.c | 22 +++++++++++-----------
3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 5e01675af7ab..81801ba78b1e 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -351,6 +351,7 @@ extern unsigned long nr_free_buffer_pages(void);
extern void lru_note_cost(struct lruvec *lruvec, bool file,
unsigned int nr_pages);
extern void lru_note_cost_folio(struct folio *);
+extern void folio_add_lru(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/folio-compat.c b/mm/folio-compat.c
index c1e01bc36d32..6de3cd78a4ae 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -102,3 +102,9 @@ bool redirty_page_for_writepage(struct writeback_control *wbc,
return folio_redirty_for_writepage(wbc, page_folio(page));
}
EXPORT_SYMBOL(redirty_page_for_writepage);
+
+void lru_cache_add(struct page *page)
+{
+ folio_add_lru(page_folio(page));
+}
+EXPORT_SYMBOL(lru_cache_add);
diff --git a/mm/swap.c b/mm/swap.c
index 42851b9d6316..bf1b90d1c2f0 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -459,29 +459,29 @@ void folio_mark_accessed(struct folio *folio)
EXPORT_SYMBOL(folio_mark_accessed);

/**
- * lru_cache_add - add a page to a page list
- * @page: the page to be added to the LRU.
+ * folio_add_lru - Add a folio to an LRU list.
+ * @folio: The folio to be added to the LRU.
*
- * Queue the page for addition to the LRU via pagevec. The decision on whether
+ * Queue the folio for addition to the LRU. The decision on whether
* to add the page to the [in]active [file|anon] list is deferred until the
- * pagevec is drained. This gives a chance for the caller of lru_cache_add()
- * have the page added to the active list using mark_page_accessed().
+ * pagevec is drained. This gives a chance for the caller of folio_add_lru()
+ * have the folio added to the active list using folio_mark_accessed().
*/
-void lru_cache_add(struct page *page)
+void folio_add_lru(struct folio *folio)
{
struct pagevec *pvec;

- VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
- VM_BUG_ON_PAGE(PageLRU(page), page);
+ VM_BUG_ON_FOLIO(folio_active(folio) && folio_unevictable(folio), folio);
+ VM_BUG_ON_FOLIO(folio_lru(folio), folio);

- get_page(page);
+ folio_get(folio);
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_add);
- if (pagevec_add_and_need_flush(pvec, page))
+ if (pagevec_add_and_need_flush(pvec, &folio->page))
__pagevec_lru_add(pvec);
local_unlock(&lru_pvecs.lock);
}
-EXPORT_SYMBOL(lru_cache_add);
+EXPORT_SYMBOL(folio_add_lru);

/**
* lru_cache_add_inactive_or_unevictable
--
2.30.2