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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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e904bce2d9
During page isolation, the original migratetype is overwritten, since MIGRATE_* are enums and stored in pageblock bitmaps. Change MIGRATE_ISOLATE to be stored a standalone bit, PB_migrate_isolate, like PB_compact_skip, so that migratetype is not lost during pageblock isolation. Link: https://lkml.kernel.org/r/20250617021115.2331563-3-ziy@nvidia.com Signed-off-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: David Hildenbrand <david@redhat.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Brendan Jackman <jackmanb@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Richard Chang <richardycc@google.com> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Macros for manipulating and testing flags related to a
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* pageblock_nr_pages number of pages.
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*
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* Copyright (C) IBM Corporation, 2006
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*
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* Original author, Mel Gorman
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* Major cleanups and reduction of bit operations, Andy Whitcroft
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*/
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#ifndef PAGEBLOCK_FLAGS_H
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#define PAGEBLOCK_FLAGS_H
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#include <linux/types.h>
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#define PB_migratetype_bits 3
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/* Bit indices that affect a whole block of pages */
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enum pageblock_bits {
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PB_migrate,
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PB_migrate_end = PB_migrate + PB_migratetype_bits - 1,
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/* 3 bits required for migrate types */
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PB_compact_skip,/* If set the block is skipped by compaction */
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#ifdef CONFIG_MEMORY_ISOLATION
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/*
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* Pageblock isolation is represented with a separate bit, so that
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* the migratetype of a block is not overwritten by isolation.
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*/
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PB_migrate_isolate, /* If set the block is isolated */
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#endif
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/*
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* Assume the bits will always align on a word. If this assumption
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* changes then get/set pageblock needs updating.
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*/
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__NR_PAGEBLOCK_BITS
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};
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#define NR_PAGEBLOCK_BITS (roundup_pow_of_two(__NR_PAGEBLOCK_BITS))
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#define MIGRATETYPE_MASK ((1UL << (PB_migrate_end + 1)) - 1)
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#ifdef CONFIG_MEMORY_ISOLATION
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#define MIGRATETYPE_AND_ISO_MASK \
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(((1UL << (PB_migrate_end + 1)) - 1) | BIT(PB_migrate_isolate))
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#else
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#define MIGRATETYPE_AND_ISO_MASK MIGRATETYPE_MASK
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#endif
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#if defined(CONFIG_HUGETLB_PAGE)
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#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
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/* Huge page sizes are variable */
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extern unsigned int pageblock_order;
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#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
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/*
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* Huge pages are a constant size, but don't exceed the maximum allocation
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* granularity.
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*/
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#define pageblock_order MIN_T(unsigned int, HUGETLB_PAGE_ORDER, PAGE_BLOCK_MAX_ORDER)
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#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
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#elif defined(CONFIG_TRANSPARENT_HUGEPAGE)
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#define pageblock_order MIN_T(unsigned int, HPAGE_PMD_ORDER, PAGE_BLOCK_MAX_ORDER)
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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/* If huge pages are not used, group by PAGE_BLOCK_MAX_ORDER */
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#define pageblock_order PAGE_BLOCK_MAX_ORDER
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#endif /* CONFIG_HUGETLB_PAGE */
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#define pageblock_nr_pages (1UL << pageblock_order)
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#define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages)
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#define pageblock_aligned(pfn) IS_ALIGNED((pfn), pageblock_nr_pages)
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#define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages)
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#define pageblock_end_pfn(pfn) ALIGN((pfn) + 1, pageblock_nr_pages)
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/* Forward declaration */
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struct page;
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enum migratetype get_pfnblock_migratetype(const struct page *page,
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unsigned long pfn);
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bool get_pfnblock_bit(const struct page *page, unsigned long pfn,
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enum pageblock_bits pb_bit);
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void set_pfnblock_bit(const struct page *page, unsigned long pfn,
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enum pageblock_bits pb_bit);
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void clear_pfnblock_bit(const struct page *page, unsigned long pfn,
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enum pageblock_bits pb_bit);
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/* Declarations for getting and setting flags. See mm/page_alloc.c */
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#ifdef CONFIG_COMPACTION
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#define get_pageblock_skip(page) \
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get_pfnblock_bit(page, page_to_pfn(page), PB_compact_skip)
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#define clear_pageblock_skip(page) \
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clear_pfnblock_bit(page, page_to_pfn(page), PB_compact_skip)
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#define set_pageblock_skip(page) \
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set_pfnblock_bit(page, page_to_pfn(page), PB_compact_skip)
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#else
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static inline bool get_pageblock_skip(struct page *page)
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{
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return false;
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}
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static inline void clear_pageblock_skip(struct page *page)
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{
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}
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static inline void set_pageblock_skip(struct page *page)
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{
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}
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#endif /* CONFIG_COMPACTION */
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#endif /* PAGEBLOCK_FLAGS_H */
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