Contributors: 3
Author Tokens Token Proportion Commits Commit Proportion
Vladimir Davydov 354 73.60% 1 33.33%
Yang Shi 126 26.20% 1 33.33%
Greg Kroah-Hartman 1 0.21% 1 33.33%
Total 481 3 
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MM_PAGE_IDLE_H
#define _LINUX_MM_PAGE_IDLE_H

#include <linux/bitops.h>
#include <linux/page-flags.h>
#include <linux/page_ext.h>

#ifdef CONFIG_IDLE_PAGE_TRACKING

#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 */
/*
 * 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)
{
	struct page_ext *page_ext = lookup_page_ext(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)
{
	struct page_ext *page_ext = lookup_page_ext(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)
{
	struct page_ext *page_ext = lookup_page_ext(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)
{
	struct page_ext *page_ext = lookup_page_ext(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)
{
	struct page_ext *page_ext = lookup_page_ext(page);

	if (unlikely(!page_ext))
		return;

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

static inline void clear_page_idle(struct page *page)
{
	struct page_ext *page_ext = lookup_page_ext(page);

	if (unlikely(!page_ext))
		return;

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

#else /* !CONFIG_IDLE_PAGE_TRACKING */

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

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

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

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

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

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

#endif /* CONFIG_IDLE_PAGE_TRACKING */

#endif /* _LINUX_MM_PAGE_IDLE_H */