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mm: Add folio_young and folio_idle
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Idle page tracking is handled through page_ext on 32-bit architectures.
Add folio equivalents for 32-bit and move all the page compatibility
parts to common code.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
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Matthew Wilcox (Oracle) committed Oct 18, 2021
1 parent b424de3 commit 35a020b
Showing 1 changed file with 49 additions and 50 deletions.
99 changes: 49 additions & 50 deletions include/linux/page_idle.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,133 +8,132 @@

#ifdef CONFIG_PAGE_IDLE_FLAG

#ifdef CONFIG_64BIT
static inline bool page_is_young(struct page *page)
{
return PageYoung(page);
}

static inline void set_page_young(struct page *page)
{
SetPageYoung(page);
}

static inline bool test_and_clear_page_young(struct page *page)
{
return TestClearPageYoung(page);
}

static inline bool page_is_idle(struct page *page)
{
return PageIdle(page);
}

static inline void set_page_idle(struct page *page)
{
SetPageIdle(page);
}

static inline void clear_page_idle(struct page *page)
{
ClearPageIdle(page);
}
#else /* !CONFIG_64BIT */
#ifndef CONFIG_64BIT
/*
* If there is not enough space to store Idle and Young bits in page flags, use
* page ext flags instead.
*/
extern struct page_ext_operations page_idle_ops;

static inline bool page_is_young(struct page *page)
static inline bool folio_test_young(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_ext *page_ext = lookup_page_ext(&folio->page);

if (unlikely(!page_ext))
return false;

return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
}

static inline void set_page_young(struct page *page)
static inline void folio_set_young(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_ext *page_ext = lookup_page_ext(&folio->page);

if (unlikely(!page_ext))
return;

set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
}

static inline bool test_and_clear_page_young(struct page *page)
static inline bool folio_test_clear_young(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_ext *page_ext = lookup_page_ext(&folio->page);

if (unlikely(!page_ext))
return false;

return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
}

static inline bool page_is_idle(struct page *page)
static inline bool folio_test_idle(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_ext *page_ext = lookup_page_ext(&folio->page);

if (unlikely(!page_ext))
return false;

return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
}

static inline void set_page_idle(struct page *page)
static inline void folio_set_idle(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_ext *page_ext = lookup_page_ext(&folio->page);

if (unlikely(!page_ext))
return;

set_bit(PAGE_EXT_IDLE, &page_ext->flags);
}

static inline void clear_page_idle(struct page *page)
static inline void folio_clear_idle(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_ext *page_ext = lookup_page_ext(&folio->page);

if (unlikely(!page_ext))
return;

clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
}
#endif /* CONFIG_64BIT */
#endif /* !CONFIG_64BIT */

#else /* !CONFIG_PAGE_IDLE_FLAG */

static inline bool page_is_young(struct page *page)
static inline bool folio_test_young(struct folio *folio)
{
return false;
}

static inline void set_page_young(struct page *page)
static inline void folio_set_young(struct folio *folio)
{
}

static inline bool test_and_clear_page_young(struct page *page)
static inline bool folio_test_clear_young(struct folio *folio)
{
return false;
}

static inline bool page_is_idle(struct page *page)
static inline bool folio_test_idle(struct folio *folio)
{
return false;
}

static inline void set_page_idle(struct page *page)
static inline void folio_set_idle(struct folio *folio)
{
}

static inline void clear_page_idle(struct page *page)
static inline void folio_clear_idle(struct folio *folio)
{
}

#endif /* CONFIG_PAGE_IDLE_FLAG */

static inline bool page_is_young(struct page *page)
{
return folio_test_young(page_folio(page));
}

static inline void set_page_young(struct page *page)
{
folio_set_young(page_folio(page));
}

static inline bool test_and_clear_page_young(struct page *page)
{
return folio_test_clear_young(page_folio(page));
}

static inline bool page_is_idle(struct page *page)
{
return folio_test_idle(page_folio(page));
}

static inline void set_page_idle(struct page *page)
{
folio_set_idle(page_folio(page));
}

static inline void clear_page_idle(struct page *page)
{
folio_clear_idle(page_folio(page));
}
#endif /* _LINUX_MM_PAGE_IDLE_H */

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