| 1 |
62 |
marcus.erl |
/*
|
| 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 |
|
|
/* Macro to aid the definition of ranges of bits */
|
| 29 |
|
|
#define PB_range(name, required_bits) \
|
| 30 |
|
|
name, name ## _end = (name + required_bits) - 1
|
| 31 |
|
|
|
| 32 |
|
|
/* Bit indices that affect a whole block of pages */
|
| 33 |
|
|
enum pageblock_bits {
|
| 34 |
|
|
PB_range(PB_migrate, 3), /* 3 bits required for migrate types */
|
| 35 |
|
|
NR_PAGEBLOCK_BITS
|
| 36 |
|
|
};
|
| 37 |
|
|
|
| 38 |
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
| 39 |
|
|
|
| 40 |
|
|
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
|
| 41 |
|
|
|
| 42 |
|
|
/* Huge page sizes are variable */
|
| 43 |
|
|
extern int pageblock_order;
|
| 44 |
|
|
|
| 45 |
|
|
#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
|
| 46 |
|
|
|
| 47 |
|
|
/* Huge pages are a constant size */
|
| 48 |
|
|
#define pageblock_order HUGETLB_PAGE_ORDER
|
| 49 |
|
|
|
| 50 |
|
|
#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
|
| 51 |
|
|
|
| 52 |
|
|
#else /* CONFIG_HUGETLB_PAGE */
|
| 53 |
|
|
|
| 54 |
|
|
/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
|
| 55 |
|
|
#define pageblock_order (MAX_ORDER-1)
|
| 56 |
|
|
|
| 57 |
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
| 58 |
|
|
|
| 59 |
|
|
#define pageblock_nr_pages (1UL << pageblock_order)
|
| 60 |
|
|
|
| 61 |
|
|
/* Forward declaration */
|
| 62 |
|
|
struct page;
|
| 63 |
|
|
|
| 64 |
|
|
/* Declarations for getting and setting flags. See mm/page_alloc.c */
|
| 65 |
|
|
unsigned long get_pageblock_flags_group(struct page *page,
|
| 66 |
|
|
int start_bitidx, int end_bitidx);
|
| 67 |
|
|
void set_pageblock_flags_group(struct page *page, unsigned long flags,
|
| 68 |
|
|
int start_bitidx, int end_bitidx);
|
| 69 |
|
|
|
| 70 |
|
|
#define get_pageblock_flags(page) \
|
| 71 |
|
|
get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1)
|
| 72 |
|
|
#define set_pageblock_flags(page) \
|
| 73 |
|
|
set_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1)
|
| 74 |
|
|
|
| 75 |
|
|
#endif /* PAGEBLOCK_FLAGS_H */
|
