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The macro PAGE_REPORTING_MIN_ORDER is defined as the page reporting threshold. It can't be adjusted at runtime. This introduces a variable (@page_reporting_order) to replace the marcro (PAGE_REPORTING_MIN_ORDER). MAX_ORDER is assigned to it initially, meaning the page reporting is disabled. It will be specified by driver if valid one is provided. Otherwise, it will fall back to @pageblock_order. It's also exported so that the page reporting order can be adjusted at runtime. Link: https://lkml.kernel.org/r/20210625014710.42954-3-gshan@redhat.com Signed-off-by: Gavin Shan <gshan@redhat.com> Suggested-by: David Hildenbrand <david@redhat.com> Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MM_PAGE_REPORTING_H
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#define _MM_PAGE_REPORTING_H
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#include <linux/mmzone.h>
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#include <linux/pageblock-flags.h>
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#include <linux/page-isolation.h>
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#include <linux/jump_label.h>
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#include <linux/slab.h>
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#include <linux/pgtable.h>
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#include <linux/scatterlist.h>
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#ifdef CONFIG_PAGE_REPORTING
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DECLARE_STATIC_KEY_FALSE(page_reporting_enabled);
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extern unsigned int page_reporting_order;
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void __page_reporting_notify(void);
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static inline bool page_reported(struct page *page)
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{
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return static_branch_unlikely(&page_reporting_enabled) &&
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PageReported(page);
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}
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/**
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* page_reporting_notify_free - Free page notification to start page processing
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*
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* This function is meant to act as a screener for __page_reporting_notify
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* which will determine if a give zone has crossed over the high-water mark
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* that will justify us beginning page treatment. If we have crossed that
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* threshold then it will start the process of pulling some pages and
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* placing them in the batch list for treatment.
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*/
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static inline void page_reporting_notify_free(unsigned int order)
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{
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/* Called from hot path in __free_one_page() */
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if (!static_branch_unlikely(&page_reporting_enabled))
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return;
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/* Determine if we have crossed reporting threshold */
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if (order < page_reporting_order)
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return;
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/* This will add a few cycles, but should be called infrequently */
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__page_reporting_notify();
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}
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#else /* CONFIG_PAGE_REPORTING */
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#define page_reported(_page) false
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static inline void page_reporting_notify_free(unsigned int order)
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{
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}
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#endif /* CONFIG_PAGE_REPORTING */
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#endif /*_MM_PAGE_REPORTING_H */
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