83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PAGE_COUNTER_H
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#define _LINUX_PAGE_COUNTER_H
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#include <linux/atomic.h>
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#include <linux/kernel.h>
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#include <asm/page.h>
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struct page_counter {
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atomic_long_t usage;
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unsigned long min;
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unsigned long low;
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unsigned long high;
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unsigned long max;
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/* effective memory.min and memory.min usage tracking */
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unsigned long emin;
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atomic_long_t min_usage;
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atomic_long_t children_min_usage;
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/* effective memory.low and memory.low usage tracking */
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unsigned long elow;
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atomic_long_t low_usage;
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atomic_long_t children_low_usage;
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/* legacy */
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unsigned long watermark;
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unsigned long failcnt;
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/*
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* 'parent' is placed here to be far from 'usage' to reduce
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* cache false sharing, as 'usage' is written mostly while
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* parent is frequently read for cgroup's hierarchical
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* counting nature.
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*/
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struct page_counter *parent;
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};
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#if BITS_PER_LONG == 32
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#define PAGE_COUNTER_MAX LONG_MAX
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#else
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#define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE)
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#endif
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static inline void page_counter_init(struct page_counter *counter,
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struct page_counter *parent)
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{
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atomic_long_set(&counter->usage, 0);
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counter->max = PAGE_COUNTER_MAX;
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counter->parent = parent;
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}
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static inline unsigned long page_counter_read(struct page_counter *counter)
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{
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return atomic_long_read(&counter->usage);
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}
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void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
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void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
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bool page_counter_try_charge(struct page_counter *counter,
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unsigned long nr_pages,
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struct page_counter **fail);
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void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
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void page_counter_set_min(struct page_counter *counter, unsigned long nr_pages);
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void page_counter_set_low(struct page_counter *counter, unsigned long nr_pages);
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static inline void page_counter_set_high(struct page_counter *counter,
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unsigned long nr_pages)
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{
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WRITE_ONCE(counter->high, nr_pages);
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}
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int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages);
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int page_counter_memparse(const char *buf, const char *max,
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unsigned long *nr_pages);
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static inline void page_counter_reset_watermark(struct page_counter *counter)
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{
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counter->watermark = page_counter_read(counter);
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}
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#endif /* _LINUX_PAGE_COUNTER_H */
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