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Subject[PATCH 3/7] mm: rework __isolate_lru_page() file/anon filter
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This patch adds file/anon filter bits into isolate_mode_t,
this allows to simplify checks in __isolate_lru_page().

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
include/linux/mmzone.h | 4 ++++
include/linux/swap.h | 2 +-
mm/compaction.c | 5 +++--
mm/vmscan.c | 27 +++++++++++++--------------
4 files changed, 21 insertions(+), 17 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index eff4918..2fed935 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -193,6 +193,10 @@ struct lruvec {
#define ISOLATE_UNMAPPED ((__force isolate_mode_t)0x8)
/* Isolate for asynchronous migration */
#define ISOLATE_ASYNC_MIGRATE ((__force isolate_mode_t)0x10)
+/* Isolate swap-backed pages */
+#define ISOLATE_ANON ((__force isolate_mode_t)0x20)
+/* Isolate file-backed pages */
+#define ISOLATE_FILE ((__force isolate_mode_t)0x40)

/* LRU Isolation modes. */
typedef unsigned __bitwise__ isolate_mode_t;
diff --git a/include/linux/swap.h b/include/linux/swap.h
index ba2c8d7..dc6e6a3 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -254,7 +254,7 @@ static inline void lru_cache_add_file(struct page *page)
/* linux/mm/vmscan.c */
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask, nodemask_t *mask);
-extern int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file);
+extern int __isolate_lru_page(struct page *page, isolate_mode_t mode);
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
gfp_t gfp_mask, bool noswap);
extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
diff --git a/mm/compaction.c b/mm/compaction.c
index 74a8c82..cc054f7 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -261,7 +261,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
unsigned long last_pageblock_nr = 0, pageblock_nr;
unsigned long nr_scanned = 0, nr_isolated = 0;
struct list_head *migratelist = &cc->migratepages;
- isolate_mode_t mode = ISOLATE_ACTIVE|ISOLATE_INACTIVE;
+ isolate_mode_t mode = ISOLATE_ACTIVE | ISOLATE_INACTIVE |
+ ISOLATE_FILE | ISOLATE_ANON;

/* Do not scan outside zone boundaries */
low_pfn = max(cc->migrate_pfn, zone->zone_start_pfn);
@@ -375,7 +376,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
mode |= ISOLATE_ASYNC_MIGRATE;

/* Try isolate the page */
- if (__isolate_lru_page(page, mode, 0) != 0)
+ if (__isolate_lru_page(page, mode) != 0)
continue;

VM_BUG_ON(PageTransCompound(page));
diff --git a/mm/vmscan.c b/mm/vmscan.c
index af6cfe7..1b70338 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1029,27 +1029,18 @@ keep_lumpy:
*
* returns 0 on success, -ve errno on failure.
*/
-int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
+int __isolate_lru_page(struct page *page, isolate_mode_t mode)
{
- bool all_lru_mode;
int ret = -EINVAL;

/* Only take pages on the LRU. */
if (!PageLRU(page))
return ret;

- all_lru_mode = (mode & (ISOLATE_ACTIVE|ISOLATE_INACTIVE)) ==
- (ISOLATE_ACTIVE|ISOLATE_INACTIVE);
-
- /*
- * When checking the active state, we need to be sure we are
- * dealing with comparible boolean values. Take the logical not
- * of each.
- */
- if (!all_lru_mode && !PageActive(page) != !(mode & ISOLATE_ACTIVE))
+ if (!(mode & (PageActive(page) ? ISOLATE_ACTIVE : ISOLATE_INACTIVE)))
return ret;

- if (!all_lru_mode && !!page_is_file_cache(page) != file)
+ if (!(mode & (page_is_file_cache(page) ? ISOLATE_FILE : ISOLATE_ANON)))
return ret;

/*
@@ -1166,7 +1157,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,

VM_BUG_ON(!PageLRU(page));

- switch (__isolate_lru_page(page, mode, file)) {
+ switch (__isolate_lru_page(page, mode)) {
case 0:
mem_cgroup_lru_del(page);
list_move(&page->lru, dst);
@@ -1224,7 +1215,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
!PageSwapCache(cursor_page))
break;

- if (__isolate_lru_page(cursor_page, mode, file) == 0) {
+ if (__isolate_lru_page(cursor_page, mode) == 0) {
unsigned int isolated_pages;

mem_cgroup_lru_del(cursor_page);
@@ -1520,6 +1511,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
isolate_mode |= ISOLATE_UNMAPPED;
if (!sc->may_writepage)
isolate_mode |= ISOLATE_CLEAN;
+ if (file)
+ isolate_mode |= ISOLATE_FILE;
+ else
+ isolate_mode |= ISOLATE_ANON;

spin_lock_irq(&zone->lru_lock);

@@ -1682,6 +1677,10 @@ static void shrink_active_list(unsigned long nr_to_scan,
isolate_mode |= ISOLATE_UNMAPPED;
if (!sc->may_writepage)
isolate_mode |= ISOLATE_CLEAN;
+ if (file)
+ isolate_mode |= ISOLATE_FILE;
+ else
+ isolate_mode |= ISOLATE_ANON;

spin_lock_irq(&zone->lru_lock);



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