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82 lines
2.3 KiB
82 lines
2.3 KiB
/* 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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