b2a0ac8875
This patch adds the core of the fragmentation reduction strategy. It works by grouping pages together based on their ability to migrate or be reclaimed. Basically, it works by breaking the list in zone->free_area list into MIGRATE_TYPES number of lists. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/*
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* Macros for manipulating and testing flags related to a
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* MAX_ORDER_NR_PAGES block 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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/* Macro to aid the definition of ranges of bits */
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#define PB_range(name, required_bits) \
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name, name ## _end = (name + required_bits) - 1
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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_range(PB_migrate, 1), /* 1 bit required for migrate types */
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NR_PAGEBLOCK_BITS
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};
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/* Forward declaration */
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struct page;
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/* Declarations for getting and setting flags. See mm/page_alloc.c */
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unsigned long get_pageblock_flags_group(struct page *page,
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int start_bitidx, int end_bitidx);
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void set_pageblock_flags_group(struct page *page, unsigned long flags,
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int start_bitidx, int end_bitidx);
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#define get_pageblock_flags(page) \
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get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1)
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#define set_pageblock_flags(page) \
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set_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1)
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#endif /* PAGEBLOCK_FLAGS_H */
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