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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _MM_PAGE_REPORTING_H
3#define _MM_PAGE_REPORTING_H
4
5#include <linux/mmzone.h>
6#include <linux/pageblock-flags.h>
7#include <linux/page-isolation.h>
8#include <linux/jump_label.h>
9#include <linux/slab.h>
10#include <linux/pgtable.h>
11#include <linux/scatterlist.h>
12
13#define PAGE_REPORTING_MIN_ORDER pageblock_order
14
15#ifdef CONFIG_PAGE_REPORTING
16DECLARE_STATIC_KEY_FALSE(page_reporting_enabled);
17void __page_reporting_notify(void);
18
19static inline bool page_reported(struct page *page)
20{
21 return static_branch_unlikely(&page_reporting_enabled) &&
22 PageReported(page);
23}
24
25/**
26 * page_reporting_notify_free - Free page notification to start page processing
27 *
28 * This function is meant to act as a screener for __page_reporting_notify
29 * which will determine if a give zone has crossed over the high-water mark
30 * that will justify us beginning page treatment. If we have crossed that
31 * threshold then it will start the process of pulling some pages and
32 * placing them in the batch list for treatment.
33 */
34static inline void page_reporting_notify_free(unsigned int order)
35{
36 /* Called from hot path in __free_one_page() */
37 if (!static_branch_unlikely(&page_reporting_enabled))
38 return;
39
40 /* Determine if we have crossed reporting threshold */
41 if (order < PAGE_REPORTING_MIN_ORDER)
42 return;
43
44 /* This will add a few cycles, but should be called infrequently */
45 __page_reporting_notify();
46}
47#else /* CONFIG_PAGE_REPORTING */
48#define page_reported(_page) false
49
50static inline void page_reporting_notify_free(unsigned int order)
51{
52}
53#endif /* CONFIG_PAGE_REPORTING */
54#endif /*_MM_PAGE_REPORTING_H */