114 строки
3.3 KiB
C
114 строки
3.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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_migrate_skip,/* If set the block is skipped by compaction */
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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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#ifdef 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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/* Huge pages are a constant size */
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#define pageblock_order HUGETLB_PAGE_ORDER
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#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
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#else /* CONFIG_HUGETLB_PAGE */
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/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
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#define pageblock_order (MAX_ORDER-1)
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#endif /* CONFIG_HUGETLB_PAGE */
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#define pageblock_nr_pages (1UL << pageblock_order)
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/* Forward declaration */
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struct page;
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unsigned long get_pfnblock_flags_mask(struct page *page,
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unsigned long pfn,
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unsigned long end_bitidx,
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unsigned long mask);
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void set_pfnblock_flags_mask(struct page *page,
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unsigned long flags,
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unsigned long pfn,
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unsigned long end_bitidx,
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unsigned long mask);
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/* Declarations for getting and setting flags. See mm/page_alloc.c */
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#define get_pageblock_flags_group(page, start_bitidx, end_bitidx) \
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get_pfnblock_flags_mask(page, page_to_pfn(page), \
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end_bitidx, \
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(1 << (end_bitidx - start_bitidx + 1)) - 1)
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#define set_pageblock_flags_group(page, flags, start_bitidx, end_bitidx) \
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set_pfnblock_flags_mask(page, flags, page_to_pfn(page), \
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end_bitidx, \
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(1 << (end_bitidx - start_bitidx + 1)) - 1)
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#ifdef CONFIG_COMPACTION
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#define get_pageblock_skip(page) \
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get_pageblock_flags_group(page, PB_migrate_skip, \
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PB_migrate_skip)
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#define clear_pageblock_skip(page) \
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set_pageblock_flags_group(page, 0, PB_migrate_skip, \
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PB_migrate_skip)
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#define set_pageblock_skip(page) \
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set_pageblock_flags_group(page, 1, PB_migrate_skip, \
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PB_migrate_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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