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1 | /* |
2 | * Macros for manipulating and testing flags related to a |
3 | * pageblock_nr_pages number of pages. |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation version 2 of the License |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
17 | * |
18 | * Copyright (C) IBM Corporation, 2006 |
19 | * |
20 | * Original author, Mel Gorman |
21 | * Major cleanups and reduction of bit operations, Andy Whitcroft |
22 | */ |
23 | #ifndef PAGEBLOCK_FLAGS_H |
24 | #define PAGEBLOCK_FLAGS_H |
25 | |
26 | #include <linux/types.h> |
27 | |
28 | /* Bit indices that affect a whole block of pages */ |
29 | enum pageblock_bits { |
30 | PB_migrate, |
31 | PB_migrate_end = PB_migrate + 3 - 1, |
32 | /* 3 bits required for migrate types */ |
33 | #ifdef CONFIG_COMPACTION |
34 | PB_migrate_skip,/* If set the block is skipped by compaction */ |
35 | #endif /* CONFIG_COMPACTION */ |
36 | NR_PAGEBLOCK_BITS |
37 | }; |
38 | |
39 | #ifdef CONFIG_HUGETLB_PAGE |
40 | |
41 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
42 | |
43 | /* Huge page sizes are variable */ |
44 | extern int pageblock_order; |
45 | |
46 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ |
47 | |
48 | /* Huge pages are a constant size */ |
49 | #define pageblock_order HUGETLB_PAGE_ORDER |
50 | |
51 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ |
52 | |
53 | #else /* CONFIG_HUGETLB_PAGE */ |
54 | |
55 | /* If huge pages are not used, group by MAX_ORDER_NR_PAGES */ |
56 | #define pageblock_order (MAX_ORDER-1) |
57 | |
58 | #endif /* CONFIG_HUGETLB_PAGE */ |
59 | |
60 | #define pageblock_nr_pages (1UL << pageblock_order) |
61 | |
62 | /* Forward declaration */ |
63 | struct page; |
64 | |
65 | /* Declarations for getting and setting flags. See mm/page_alloc.c */ |
66 | unsigned long get_pageblock_flags_group(struct page *page, |
67 | int start_bitidx, int end_bitidx); |
68 | void set_pageblock_flags_group(struct page *page, unsigned long flags, |
69 | int start_bitidx, int end_bitidx); |
70 | |
71 | #ifdef CONFIG_COMPACTION |
72 | #define get_pageblock_skip(page) \ |
73 | get_pageblock_flags_group(page, PB_migrate_skip, \ |
74 | PB_migrate_skip) |
75 | #define clear_pageblock_skip(page) \ |
76 | set_pageblock_flags_group(page, 0, PB_migrate_skip, \ |
77 | PB_migrate_skip) |
78 | #define set_pageblock_skip(page) \ |
79 | set_pageblock_flags_group(page, 1, PB_migrate_skip, \ |
80 | PB_migrate_skip) |
81 | #endif /* CONFIG_COMPACTION */ |
82 | |
83 | #endif /* PAGEBLOCK_FLAGS_H */ |
84 |
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