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mm: remove MIGRATE_ISOLATE check in hotpath 

Several functions test MIGRATE_ISOLATE and some of those are hotpath but
MIGRATE_ISOLATE is used only if we enable CONFIG_MEMORY_ISOLATION(ie,
CMA, memory-hotplug and memory-failure) which are not common config
option.  So let's not add unnecessary overhead and code when we don't
enable CONFIG_MEMORY_ISOLATION.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2013-02-22 16:33:58 -08:00 committed by Linus Torvalds
parent c60514b631
commit 194159fbcc
5 changed files with 38 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/mmzone.h
View File

@ -57,7 +57,9 @@ enum {
*/
MIGRATE_CMA,
#endif
#ifdef CONFIG_MEMORY_ISOLATION
MIGRATE_ISOLATE, /* can't allocate from here */
#endif
MIGRATE_TYPES
};

19
include/linux/page-isolation.h
View File

@ -1,6 +1,25 @@
#ifndef __LINUX_PAGEISOLATION_H
#define __LINUX_PAGEISOLATION_H
#ifdef CONFIG_MEMORY_ISOLATION
static inline bool is_migrate_isolate_page(struct page *page)
{
return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
}
static inline bool is_migrate_isolate(int migratetype)
{
return migratetype == MIGRATE_ISOLATE;
}
#else
static inline bool is_migrate_isolate_page(struct page *page)
{
return false;
}
static inline bool is_migrate_isolate(int migratetype)
{
return false;
}
#endif
bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
bool skip_hwpoisoned_pages);

6
mm/compaction.c
View File

@ -15,6 +15,7 @@
#include <linux/sysctl.h>
#include <linux/sysfs.h>
#include <linux/balloon_compaction.h>
#include <linux/page-isolation.h>
#include "internal.h"
#ifdef CONFIG_COMPACTION
@ -215,7 +216,10 @@ static bool suitable_migration_target(struct page *page)
int migratetype = get_pageblock_migratetype(page);
/* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
if (migratetype == MIGRATE_RESERVE)
return false;
if (is_migrate_isolate(migratetype))
return false;
/* If the page is a large free page, then allow migration */

16
mm/page_alloc.c
View File

@ -673,7 +673,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
__free_one_page(page, zone, 0, mt);
trace_mm_page_pcpu_drain(page, 0, mt);
if (likely(get_pageblock_migratetype(page) != MIGRATE_ISOLATE)) {
if (likely(!is_migrate_isolate_page(page))) {
__mod_zone_page_state(zone, NR_FREE_PAGES, 1);
if (is_migrate_cma(mt))
__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
@ -691,7 +691,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
zone->pages_scanned = 0;
__free_one_page(page, zone, order, migratetype);
if (unlikely(migratetype != MIGRATE_ISOLATE))
if (unlikely(!is_migrate_isolate(migratetype)))
__mod_zone_freepage_state(zone, 1 << order, migratetype);
spin_unlock(&zone->lock);
}
@ -923,7 +923,9 @@ static int fallbacks[MIGRATE_TYPES][4] = {
[MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE },
#endif
[MIGRATE_RESERVE] = { MIGRATE_RESERVE }, /* Never used */
#ifdef CONFIG_MEMORY_ISOLATION
[MIGRATE_ISOLATE] = { MIGRATE_RESERVE }, /* Never used */
#endif
};
/*
@ -1149,7 +1151,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
list_add_tail(&page->lru, list);
if (IS_ENABLED(CONFIG_CMA)) {
mt = get_pageblock_migratetype(page);
if (!is_migrate_cma(mt) && mt != MIGRATE_ISOLATE)
if (!is_migrate_cma(mt) && !is_migrate_isolate(mt))
mt = migratetype;
}
set_freepage_migratetype(page, mt);
@ -1333,7 +1335,7 @@ void free_hot_cold_page(struct page *page, int cold)
* excessively into the page allocator
*/
if (migratetype >= MIGRATE_PCPTYPES) {
if (unlikely(migratetype == MIGRATE_ISOLATE)) {
if (unlikely(is_migrate_isolate(migratetype))) {
free_one_page(zone, page, 0, migratetype);
goto out;
}
@ -1407,7 +1409,7 @@ static int __isolate_free_page(struct page *page, unsigned int order)
zone = page_zone(page);
mt = get_pageblock_migratetype(page);
if (mt != MIGRATE_ISOLATE) {
if (!is_migrate_isolate(mt)) {
/* Obey watermarks as if the page was being allocated */
watermark = low_wmark_pages(zone) + (1 << order);
if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
@ -1426,7 +1428,7 @@ static int __isolate_free_page(struct page *page, unsigned int order)
struct page *endpage = page + (1 << order) - 1;
for (; page < endpage; page += pageblock_nr_pages) {
int mt = get_pageblock_migratetype(page);
if (mt != MIGRATE_ISOLATE && !is_migrate_cma(mt))
if (!is_migrate_isolate(mt) && !is_migrate_cma(mt))
set_pageblock_migratetype(page,
MIGRATE_MOVABLE);
}
@ -2904,7 +2906,9 @@ static void show_migration_types(unsigned char type)
#ifdef CONFIG_CMA
[MIGRATE_CMA] = 'C',
#endif
#ifdef CONFIG_MEMORY_ISOLATION
[MIGRATE_ISOLATE] = 'I',
#endif
};
char tmp[MIGRATE_TYPES + 1];
char *p = tmp;

2
mm/vmstat.c
View File

@ -628,7 +628,9 @@ static char * const migratetype_names[MIGRATE_TYPES] = {
#ifdef CONFIG_CMA
"CMA",
#endif
#ifdef CONFIG_MEMORY_ISOLATION
"Isolate",
#endif
};
static void *frag_start(struct seq_file *m, loff_t *pos)