There is sometimes confusion between the global putback_lru_pages()
in migrate.c and the static putback_lru_pages() in vmscan.c: rename
the latter putback_inactive_pages(): it helps shrink_inactive_list()
rather as move_active_pages_to_lru() helps shrink_active_list().
Remove unused scan_control arg from putback_inactive_pages() and
from update_isolated_counts(). Move clear_active_flags() inside
update_isolated_counts(). Move NR_ISOLATED accounting up into
shrink_inactive_list() itself, so the balance is clearer.
Do the spin_lock_irq() before calling putback_inactive_pages() and
spin_unlock_irq() after return from it, so that it better matches
update_isolated_counts() and move_active_pages_to_lru().
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
mm/vmscan.c | 96 ++++++++++++++++++++++----------------------------
1 file changed, 44 insertions(+), 52 deletions(-)
--- mmotm.orig/mm/vmscan.c 2011-12-31 14:58:45.680036183 -0800
+++ mmotm/mm/vmscan.c 2011-12-31 17:26:25.264246809 -0800
@@ -1284,32 +1284,6 @@ static unsigned long isolate_lru_pages(u
return nr_taken;
}
-/*
- * clear_active_flags() is a helper for shrink_active_list(), clearing
- * any active bits from the pages in the list.
- */
-static unsigned long clear_active_flags(struct list_head *page_list,
- unsigned int *count)
-{
- int nr_active = 0;
- int lru;
- struct page *page;
-
- list_for_each_entry(page, page_list, lru) {
- int numpages = hpage_nr_pages(page);
- lru = page_lru_base_type(page);
- if (PageActive(page)) {
- lru += LRU_ACTIVE;
- ClearPageActive(page);
- nr_active += numpages;
- }
- if (count)
- count[lru] += numpages;
- }
-
- return nr_active;
-}
-
/**
* isolate_lru_page - tries to isolate a page from its LRU list
* @page: page to isolate from its LRU list
@@ -1383,26 +1357,21 @@ static int too_many_isolated(struct zone
return isolated > inactive;
}
-/*
- * TODO: Try merging with migrations version of putback_lru_pages
- */
static noinline_for_stack void
-putback_lru_pages(struct mem_cgroup_zone *mz, struct scan_control *sc,
- unsigned long nr_anon, unsigned long nr_file,
- struct list_head *page_list)
+putback_inactive_pages(struct mem_cgroup_zone *mz,
+ struct list_head *page_list)
{
- struct page *page;
- LIST_HEAD(pages_to_free);
- struct zone *zone = mz->zone;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
+ struct zone *zone = mz->zone;
+ LIST_HEAD(pages_to_free);
/*
* Put back any unfreeable pages.
*/
- spin_lock(&zone->lru_lock);
while (!list_empty(page_list)) {
+ struct page *page = lru_to_page(page_list);
int lru;
- page = lru_to_page(page_list);
+
VM_BUG_ON(PageLRU(page));
list_del(&page->lru);
if (unlikely(!page_evictable(page, NULL))) {
@@ -1432,26 +1401,40 @@ putback_lru_pages(struct mem_cgroup_zone
list_add(&page->lru, &pages_to_free);
}
}
- __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
- __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
- spin_unlock_irq(&zone->lru_lock);
- free_hot_cold_page_list(&pages_to_free, 1);
+ /*
+ * To save our caller's stack, now use input list for pages to free.
+ */
+ list_splice(&pages_to_free, page_list);
}
static noinline_for_stack void
update_isolated_counts(struct mem_cgroup_zone *mz,
- struct scan_control *sc,
+ struct list_head *page_list,
unsigned long *nr_anon,
- unsigned long *nr_file,
- struct list_head *isolated_list)
+ unsigned long *nr_file)
{
- unsigned long nr_active;
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
struct zone *zone = mz->zone;
unsigned int count[NR_LRU_LISTS] = { 0, };
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
+ unsigned long nr_active = 0;
+ struct page *page;
+ int lru;
+
+ /*
+ * Count pages and clear active flags
+ */
+ list_for_each_entry(page, page_list, lru) {
+ int numpages = hpage_nr_pages(page);
+ lru = page_lru_base_type(page);
+ if (PageActive(page)) {
+ lru += LRU_ACTIVE;
+ ClearPageActive(page);
+ nr_active += numpages;
+ }
+ count[lru] += numpages;
+ }
- nr_active = clear_active_flags(isolated_list, count);
__count_vm_events(PGDEACTIVATE, nr_active);
__mod_zone_page_state(zone, NR_ACTIVE_FILE,
@@ -1465,8 +1448,6 @@ update_isolated_counts(struct mem_cgroup
*nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
*nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
- __mod_zone_page_state(zone, NR_ISOLATED_ANON, *nr_anon);
- __mod_zone_page_state(zone, NR_ISOLATED_FILE, *nr_file);
reclaim_stat->recent_scanned[0] += *nr_anon;
reclaim_stat->recent_scanned[1] += *nr_file;
@@ -1571,7 +1552,10 @@ shrink_inactive_list(unsigned long nr_to
return 0;
}
- update_isolated_counts(mz, sc, &nr_anon, &nr_file, &page_list);
+ update_isolated_counts(mz, &page_list, &nr_anon, &nr_file);
+
+ __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
+ __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
spin_unlock_irq(&zone->lru_lock);
@@ -1585,12 +1569,20 @@ shrink_inactive_list(unsigned long nr_to
priority, &nr_dirty, &nr_writeback);
}
- local_irq_disable();
+ spin_lock_irq(&zone->lru_lock);
+
if (current_is_kswapd())
__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);
- putback_lru_pages(mz, sc, nr_anon, nr_file, &page_list);
+ putback_inactive_pages(mz, &page_list);
+
+ __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
+ __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
+
+ spin_unlock_irq(&zone->lru_lock);
+
+ free_hot_cold_page_list(&page_list, 1);
/*
* If reclaim is isolating dirty pages under writeback, it implies
--
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