blob: 2baeee12f48ed1c29ba0a3fa1fea12294d4b60c2 [file] [log] [blame]
Mel Gorman835c1342007-10-16 01:25:47 -07001/*
2 * Macros for manipulating and testing flags related to a
Mel Gormand9c23402007-10-16 01:26:01 -07003 * pageblock_nr_pages number of pages.
Mel Gorman835c1342007-10-16 01:25:47 -07004 *
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
Mel Gorman835c1342007-10-16 01:25:47 -070028/* Bit indices that affect a whole block of pages */
29enum pageblock_bits {
Paul Jacksonc801ed32008-05-14 08:15:23 -070030 PB_migrate,
31 PB_migrate_end = PB_migrate + 3 - 1,
32 /* 3 bits required for migrate types */
Mel Gormanbb13ffe2012-10-08 16:32:41 -070033 PB_migrate_skip,/* If set the block is skipped by compaction */
Mel Gormane58469b2014-06-04 16:10:16 -070034
35 /*
36 * Assume the bits will always align on a word. If this assumption
37 * changes then get/set pageblock needs updating.
38 */
Mel Gorman835c1342007-10-16 01:25:47 -070039 NR_PAGEBLOCK_BITS
40};
41
Mel Gormand9c23402007-10-16 01:26:01 -070042#ifdef CONFIG_HUGETLB_PAGE
43
44#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
45
46/* Huge page sizes are variable */
47extern int pageblock_order;
48
49#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
50
51/* Huge pages are a constant size */
52#define pageblock_order HUGETLB_PAGE_ORDER
53
54#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
55
56#else /* CONFIG_HUGETLB_PAGE */
57
58/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
59#define pageblock_order (MAX_ORDER-1)
60
61#endif /* CONFIG_HUGETLB_PAGE */
62
63#define pageblock_nr_pages (1UL << pageblock_order)
64
Mel Gorman835c1342007-10-16 01:25:47 -070065/* Forward declaration */
66struct page;
67
Mel Gormandc4b0ca2014-06-04 16:10:17 -070068unsigned long get_pfnblock_flags_mask(struct page *page,
69 unsigned long pfn,
Mel Gormane58469b2014-06-04 16:10:16 -070070 unsigned long end_bitidx,
71 unsigned long mask);
Mel Gormandc4b0ca2014-06-04 16:10:17 -070072
73void set_pfnblock_flags_mask(struct page *page,
Mel Gormane58469b2014-06-04 16:10:16 -070074 unsigned long flags,
Mel Gormandc4b0ca2014-06-04 16:10:17 -070075 unsigned long pfn,
Mel Gormane58469b2014-06-04 16:10:16 -070076 unsigned long end_bitidx,
77 unsigned long mask);
78
Mel Gorman835c1342007-10-16 01:25:47 -070079/* Declarations for getting and setting flags. See mm/page_alloc.c */
Mel Gormandc4b0ca2014-06-04 16:10:17 -070080#define get_pageblock_flags_group(page, start_bitidx, end_bitidx) \
81 get_pfnblock_flags_mask(page, page_to_pfn(page), \
82 end_bitidx, \
83 (1 << (end_bitidx - start_bitidx + 1)) - 1)
84#define set_pageblock_flags_group(page, flags, start_bitidx, end_bitidx) \
85 set_pfnblock_flags_mask(page, flags, page_to_pfn(page), \
86 end_bitidx, \
87 (1 << (end_bitidx - start_bitidx + 1)) - 1)
Mel Gorman835c1342007-10-16 01:25:47 -070088
Mel Gormanbb13ffe2012-10-08 16:32:41 -070089#ifdef CONFIG_COMPACTION
90#define get_pageblock_skip(page) \
91 get_pageblock_flags_group(page, PB_migrate_skip, \
Bartlomiej Zolnierkiewicz62726052012-10-10 15:53:55 -070092 PB_migrate_skip)
Mel Gormanbb13ffe2012-10-08 16:32:41 -070093#define clear_pageblock_skip(page) \
94 set_pageblock_flags_group(page, 0, PB_migrate_skip, \
Bartlomiej Zolnierkiewicz62726052012-10-10 15:53:55 -070095 PB_migrate_skip)
Mel Gormanbb13ffe2012-10-08 16:32:41 -070096#define set_pageblock_skip(page) \
97 set_pageblock_flags_group(page, 1, PB_migrate_skip, \
Bartlomiej Zolnierkiewicz62726052012-10-10 15:53:55 -070098 PB_migrate_skip)
Mel Gormanbb13ffe2012-10-08 16:32:41 -070099#endif /* CONFIG_COMPACTION */
100
Mel Gorman835c1342007-10-16 01:25:47 -0700101#endif /* PAGEBLOCK_FLAGS_H */