mm: page_alloc: reduce number of times page_to_pfn is called
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>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 8ef1e3f..472426a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -78,10 +78,15 @@
#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 {
diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
index c08730c..2baeee1 100644
--- a/include/linux/pageblock-flags.h
+++ b/include/linux/pageblock-flags.h
@@ -65,33 +65,26 @@
/* 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) \
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6e93780..6cadc86 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -560,6 +560,7 @@
*/
static inline void __free_one_page(struct page *page,
+ unsigned long pfn,
struct zone *zone, unsigned int order,
int migratetype)
{
@@ -576,7 +577,7 @@
VM_BUG_ON(migratetype == -1);
- page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1);
+ page_idx = pfn & ((1 << MAX_ORDER) - 1);
VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page);
VM_BUG_ON_PAGE(bad_range(zone, page), page);
@@ -711,7 +712,7 @@
list_del(&page->lru);
mt = get_freepage_migratetype(page);
/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
- __free_one_page(page, zone, 0, mt);
+ __free_one_page(page, page_to_pfn(page), zone, 0, mt);
trace_mm_page_pcpu_drain(page, 0, mt);
if (likely(!is_migrate_isolate_page(page))) {
__mod_zone_page_state(zone, NR_FREE_PAGES, 1);
@@ -723,13 +724,15 @@
spin_unlock(&zone->lock);
}
-static void free_one_page(struct zone *zone, struct page *page, int order,
+static void free_one_page(struct zone *zone,
+ struct page *page, unsigned long pfn,
+ int order,
int migratetype)
{
spin_lock(&zone->lock);
zone->pages_scanned = 0;
- __free_one_page(page, zone, order, migratetype);
+ __free_one_page(page, pfn, zone, order, migratetype);
if (unlikely(!is_migrate_isolate(migratetype)))
__mod_zone_freepage_state(zone, 1 << order, migratetype);
spin_unlock(&zone->lock);
@@ -766,15 +769,16 @@
{
unsigned long flags;
int migratetype;
+ unsigned long pfn = page_to_pfn(page);
if (!free_pages_prepare(page, order))
return;
local_irq_save(flags);
__count_vm_events(PGFREE, 1 << order);
- migratetype = get_pageblock_migratetype(page);
+ migratetype = get_pfnblock_migratetype(page, pfn);
set_freepage_migratetype(page, migratetype);
- free_one_page(page_zone(page), page, order, migratetype);
+ free_one_page(page_zone(page), page, pfn, order, migratetype);
local_irq_restore(flags);
}
@@ -1380,12 +1384,13 @@
struct zone *zone = page_zone(page);
struct per_cpu_pages *pcp;
unsigned long flags;
+ unsigned long pfn = page_to_pfn(page);
int migratetype;
if (!free_pages_prepare(page, 0))
return;
- migratetype = get_pageblock_migratetype(page);
+ migratetype = get_pfnblock_migratetype(page, pfn);
set_freepage_migratetype(page, migratetype);
local_irq_save(flags);
__count_vm_event(PGFREE);
@@ -1399,7 +1404,7 @@
*/
if (migratetype >= MIGRATE_PCPTYPES) {
if (unlikely(is_migrate_isolate(migratetype))) {
- free_one_page(zone, page, 0, migratetype);
+ free_one_page(zone, page, pfn, 0, migratetype);
goto out;
}
migratetype = MIGRATE_MOVABLE;
@@ -6028,17 +6033,16 @@
* @end_bitidx: The last bit of interest
* returns pageblock_bits flags
*/
-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)
{
struct zone *zone;
unsigned long *bitmap;
- unsigned long pfn, bitidx, word_bitidx;
+ unsigned long bitidx, word_bitidx;
unsigned long word;
zone = page_zone(page);
- pfn = page_to_pfn(page);
bitmap = get_pageblock_bitmap(zone, pfn);
bitidx = pfn_to_bitidx(zone, pfn);
word_bitidx = bitidx / BITS_PER_LONG;
@@ -6050,25 +6054,25 @@
}
/**
- * set_pageblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages
+ * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages
* @page: The page within the block of interest
* @start_bitidx: The first bit of interest
* @end_bitidx: The last bit of interest
* @flags: The flags to set
*/
-void set_pageblock_flags_mask(struct page *page, unsigned long flags,
+void set_pfnblock_flags_mask(struct page *page, unsigned long flags,
+ unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask)
{
struct zone *zone;
unsigned long *bitmap;
- unsigned long pfn, bitidx, word_bitidx;
+ unsigned long bitidx, word_bitidx;
unsigned long old_word, word;
BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4);
zone = page_zone(page);
- pfn = page_to_pfn(page);
bitmap = get_pageblock_bitmap(zone, pfn);
bitidx = pfn_to_bitidx(zone, pfn);
word_bitidx = bitidx / BITS_PER_LONG;