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2024-03-22 f63cd4c03ea42695d5f9b0e1798edd196923aae6

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PAGE_COUNTER_H
#define _LINUX_PAGE_COUNTER_H
 
#include <linux/atomic.h>
#include <linux/kernel.h>
#include <asm/page.h>
 
struct page_counter {
    atomic_long_t usage;
    unsigned long min;
    unsigned long low;
    unsigned long high;
    unsigned long max;
    struct page_counter *parent;
 
    /* effective memory.min and memory.min usage tracking */
    unsigned long emin;
    atomic_long_t min_usage;
    atomic_long_t children_min_usage;
 
    /* effective memory.low and memory.low usage tracking */
    unsigned long elow;
    atomic_long_t low_usage;
    atomic_long_t children_low_usage;
 
    /* legacy */
    unsigned long watermark;
    unsigned long failcnt;
};
 
#if BITS_PER_LONG == 32
#define PAGE_COUNTER_MAX LONG_MAX
#else
#define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE)
#endif
 
static inline void page_counter_init(struct page_counter *counter,
                     struct page_counter *parent)
{
    atomic_long_set(&counter->usage, 0);
    counter->max = PAGE_COUNTER_MAX;
    counter->parent = parent;
}
 
static inline unsigned long page_counter_read(struct page_counter *counter)
{
    return atomic_long_read(&counter->usage);
}
 
void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
bool page_counter_try_charge(struct page_counter *counter,
                 unsigned long nr_pages,
                 struct page_counter **fail);
void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
void page_counter_set_min(struct page_counter *counter, unsigned long nr_pages);
void page_counter_set_low(struct page_counter *counter, unsigned long nr_pages);
 
static inline void page_counter_set_high(struct page_counter *counter,
                     unsigned long nr_pages)
{
    WRITE_ONCE(counter->high, nr_pages);
}
 
int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages);
int page_counter_memparse(const char *buf, const char *max,
              unsigned long *nr_pages);
 
static inline void page_counter_reset_watermark(struct page_counter *counter)
{
    counter->watermark = page_counter_read(counter);
}
 
#endif /* _LINUX_PAGE_COUNTER_H */