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Subject[PATCH v6 3/7] mm: push lru index into shrink_[in]active_list()
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Let's toss lru index through call stack to isolate_lru_pages(),
this is better than its reconstructing from individual bits.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Hugh Dickins <hughd@google.com>
---
mm/vmscan.c | 41 +++++++++++++++++------------------------
1 files changed, 17 insertions(+), 24 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f4dca0c..fb6d54e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1127,15 +1127,14 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
* @nr_scanned: The number of pages that were scanned.
* @sc: The scan_control struct for this reclaim session
* @mode: One of the LRU isolation modes
- * @active: True [1] if isolating active pages
- * @file: True [1] if isolating file [!anon] pages
+ * @lru LRU list id for isolating
*
* returns how many pages were moved onto *@dst.
*/
static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
struct mem_cgroup_zone *mz, struct list_head *dst,
unsigned long *nr_scanned, struct scan_control *sc,
- isolate_mode_t mode, int active, int file)
+ isolate_mode_t mode, enum lru_list lru)
{
struct lruvec *lruvec;
struct list_head *src;
@@ -1144,13 +1143,9 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
unsigned long nr_lumpy_dirty = 0;
unsigned long nr_lumpy_failed = 0;
unsigned long scan;
- int lru = LRU_BASE;
+ int file = is_file_lru(lru);

lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
- if (active)
- lru += LRU_ACTIVE;
- if (file)
- lru += LRU_FILE;
src = &lruvec->lists[lru];

for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
@@ -1487,7 +1482,7 @@ static inline bool should_reclaim_stall(unsigned long nr_taken,
*/
static noinline_for_stack unsigned long
shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
- struct scan_control *sc, int priority, int file)
+ struct scan_control *sc, int priority, enum lru_list lru)
{
LIST_HEAD(page_list);
unsigned long nr_scanned;
@@ -1498,6 +1493,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
unsigned long nr_dirty = 0;
unsigned long nr_writeback = 0;
isolate_mode_t isolate_mode = ISOLATE_INACTIVE;
+ int file = is_file_lru(lru);
struct zone *zone = mz->zone;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);

@@ -1523,7 +1519,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
spin_lock_irq(&zone->lru_lock);

nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list, &nr_scanned,
- sc, isolate_mode, 0, file);
+ sc, isolate_mode, lru);
if (global_reclaim(sc)) {
zone->pages_scanned += nr_scanned;
if (current_is_kswapd())
@@ -1661,7 +1657,7 @@ static void move_active_pages_to_lru(struct zone *zone,
static void shrink_active_list(unsigned long nr_to_scan,
struct mem_cgroup_zone *mz,
struct scan_control *sc,
- int priority, int file)
+ int priority, enum lru_list lru)
{
unsigned long nr_taken;
unsigned long nr_scanned;
@@ -1673,6 +1669,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
unsigned long nr_rotated = 0;
isolate_mode_t isolate_mode = ISOLATE_ACTIVE;
+ int file = is_file_lru(lru);
struct zone *zone = mz->zone;

lru_add_drain();
@@ -1687,17 +1684,14 @@ static void shrink_active_list(unsigned long nr_to_scan,
spin_lock_irq(&zone->lru_lock);

nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold, &nr_scanned, sc,
- isolate_mode, 1, file);
+ isolate_mode, lru);
if (global_reclaim(sc))
zone->pages_scanned += nr_scanned;

reclaim_stat->recent_scanned[file] += nr_taken;

__count_zone_vm_events(PGREFILL, zone, nr_scanned);
- if (file)
- __mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken);
- else
- __mod_zone_page_state(zone, NR_ACTIVE_ANON, -nr_taken);
+ __mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken);
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
spin_unlock_irq(&zone->lru_lock);

@@ -1752,10 +1746,8 @@ static void shrink_active_list(unsigned long nr_to_scan,
*/
reclaim_stat->recent_rotated[file] += nr_rotated;

- move_active_pages_to_lru(zone, &l_active, &l_hold,
- LRU_ACTIVE + file * LRU_FILE);
- move_active_pages_to_lru(zone, &l_inactive, &l_hold,
- LRU_BASE + file * LRU_FILE);
+ move_active_pages_to_lru(zone, &l_active, &l_hold, lru);
+ move_active_pages_to_lru(zone, &l_inactive, &l_hold, lru - LRU_ACTIVE);
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&zone->lru_lock);

@@ -1855,11 +1847,11 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,

if (is_active_lru(lru)) {
if (inactive_list_is_low(mz, file))
- shrink_active_list(nr_to_scan, mz, sc, priority, file);
+ shrink_active_list(nr_to_scan, mz, sc, priority, lru);
return 0;
}

- return shrink_inactive_list(nr_to_scan, mz, sc, priority, file);
+ return shrink_inactive_list(nr_to_scan, mz, sc, priority, lru);
}

static int vmscan_swappiness(struct mem_cgroup_zone *mz,
@@ -2110,7 +2102,8 @@ restart:
* rebalance the anon lru active/inactive ratio.
*/
if (inactive_anon_is_low(mz))
- shrink_active_list(SWAP_CLUSTER_MAX, mz, sc, priority, 0);
+ shrink_active_list(SWAP_CLUSTER_MAX, mz,
+ sc, priority, LRU_ACTIVE_ANON);

/* reclaim/compaction might need reclaim to continue */
if (should_continue_reclaim(mz, nr_reclaimed,
@@ -2550,7 +2543,7 @@ static void age_active_anon(struct zone *zone, struct scan_control *sc,

if (inactive_anon_is_low(&mz))
shrink_active_list(SWAP_CLUSTER_MAX, &mz,
- sc, priority, 0);
+ sc, priority, LRU_ACTIVE_ANON);

memcg = mem_cgroup_iter(NULL, memcg, NULL);
} while (memcg);


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