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mm: page_alloc: reduce number of times page_to_pfn is called

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In the free path we calculate page_to_pfn multiple times. Reduce that.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman
2014-06-04 16:10:17 -07:00
committed by Linus Torvalds
parent e58469bafd
commit dc4b0caff2
3 changed files with 39 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/mmzone.h
View File

@@ -78,10 +78,15 @@ extern int page_group_by_mobility_disabled;
#define NR_MIGRATETYPE_BITS (PB_migrate_end - PB_migrate + 1)
#define MIGRATETYPE_MASK ((1UL << NR_MIGRATETYPE_BITS) - 1)
static inline int get_pageblock_migratetype(struct page *page)
#define get_pageblock_migratetype(page) \
get_pfnblock_flags_mask(page, page_to_pfn(page), \
PB_migrate_end, MIGRATETYPE_MASK)
static inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn)
{
BUILD_BUG_ON(PB_migrate_end - PB_migrate != 2);
return get_pageblock_flags_mask(page, PB_migrate_end, MIGRATETYPE_MASK);
return get_pfnblock_flags_mask(page, pfn, PB_migrate_end,
MIGRATETYPE_MASK);
}
struct free_area {

33
include/linux/pageblock-flags.h
View File

@@ -65,33 +65,26 @@ extern int pageblock_order;
/* Forward declaration */
struct page;
unsigned long get_pageblock_flags_mask(struct page *page,
unsigned long get_pfnblock_flags_mask(struct page *page,
unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask);
void set_pageblock_flags_mask(struct page *page,
void set_pfnblock_flags_mask(struct page *page,
unsigned long flags,
unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask);
/* Declarations for getting and setting flags. See mm/page_alloc.c */
static inline unsigned long get_pageblock_flags_group(struct page *page,
int start_bitidx, int end_bitidx)
{
unsigned long nr_flag_bits = end_bitidx - start_bitidx + 1;
unsigned long mask = (1 << nr_flag_bits) - 1;
return get_pageblock_flags_mask(page, end_bitidx, mask);
}
static inline void set_pageblock_flags_group(struct page *page,
unsigned long flags,
int start_bitidx, int end_bitidx)
{
unsigned long nr_flag_bits = end_bitidx - start_bitidx + 1;
unsigned long mask = (1 << nr_flag_bits) - 1;
set_pageblock_flags_mask(page, flags, end_bitidx, mask);
}
#define get_pageblock_flags_group(page, start_bitidx, end_bitidx) \
get_pfnblock_flags_mask(page, page_to_pfn(page), \
end_bitidx, \
(1 << (end_bitidx - start_bitidx + 1)) - 1)
#define set_pageblock_flags_group(page, flags, start_bitidx, end_bitidx) \
set_pfnblock_flags_mask(page, flags, page_to_pfn(page), \
end_bitidx, \
(1 << (end_bitidx - start_bitidx + 1)) - 1)
#ifdef CONFIG_COMPACTION
#define get_pageblock_skip(page) \