if (unlikely(PageTransHuge(page)))
flags |= TTU_SPLIT_HUGE_PMD;
- if (!try_to_unmap(page, flags)) {
+ try_to_unmap(page, flags);
+ if (page_mapped(page)) {
stat->nr_unmap_fail += nr_pages;
if (!was_swapbacked && PageSwapBacked(page))
stat->nr_lazyfree_fail += nr_pages;
unsigned int nr_reclaimed;
struct page *page, *next;
LIST_HEAD(clean_pages);
+ unsigned int noreclaim_flag;
list_for_each_entry_safe(page, next, page_list, lru) {
if (!PageHuge(page) && page_is_file_lru(page) &&
}
}
+ /*
+ * We should be safe here since we are only dealing with file pages and
+ * we are not kswapd and therefore cannot write dirty file pages. But
+ * call memalloc_noreclaim_save() anyway, just in case these conditions
+ * change in the future.
+ */
+ noreclaim_flag = memalloc_noreclaim_save();
nr_reclaimed = shrink_page_list(&clean_pages, zone->zone_pgdat, &sc,
&stat, true);
+ memalloc_noreclaim_restore(noreclaim_flag);
+
list_splice(&clean_pages, page_list);
mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE,
-(long)nr_reclaimed);
}
-/**
+/*
* Isolating page from the lruvec to fill in @dst list by nr_to_scan times.
*
* lruvec->lru_lock is heavily contended. Some of the functions that
*
* Returns the number of pages moved to the given lruvec.
*/
-static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
- struct list_head *list)
+static unsigned int move_pages_to_lru(struct lruvec *lruvec,
+ struct list_head *list)
{
int nr_pages, nr_moved = 0;
LIST_HEAD(pages_to_free);
* All pages were isolated from the same lruvec (and isolation
* inhibits memcg migration).
*/
- VM_BUG_ON_PAGE(!lruvec_holds_page_lru_lock(page, lruvec), page);
+ VM_BUG_ON_PAGE(!page_matches_lruvec(page, lruvec), page);
add_page_to_lru_list(page, lruvec);
nr_pages = thp_nr_pages(page);
nr_moved += nr_pages;
* shrink_inactive_list() is a helper for shrink_node(). It returns the number
* of reclaimed pages
*/
-static noinline_for_stack unsigned long
+static unsigned long
shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
struct scan_control *sc, enum lru_list lru)
{
LIST_HEAD(node_page_list);
struct reclaim_stat dummy_stat;
struct page *page;
+ unsigned int noreclaim_flag;
struct scan_control sc = {
.gfp_mask = GFP_KERNEL,
.priority = DEF_PRIORITY,
.may_swap = 1,
};
+ noreclaim_flag = memalloc_noreclaim_save();
+
while (!list_empty(page_list)) {
page = lru_to_page(page_list);
if (nid == NUMA_NO_NODE) {
}
}
+ memalloc_noreclaim_restore(noreclaim_flag);
+
return nr_reclaimed;
}
return sc->nr_scanned >= sc->nr_to_reclaim;
}
+/* Page allocator PCP high watermark is lowered if reclaim is active. */
+static inline void
+update_reclaim_active(pg_data_t *pgdat, int highest_zoneidx, bool active)
+{
+ int i;
+ struct zone *zone;
+
+ for (i = 0; i <= highest_zoneidx; i++) {
+ zone = pgdat->node_zones + i;
+
+ if (!managed_zone(zone))
+ continue;
+
+ if (active)
+ set_bit(ZONE_RECLAIM_ACTIVE, &zone->flags);
+ else
+ clear_bit(ZONE_RECLAIM_ACTIVE, &zone->flags);
+ }
+}
+
+static inline void
+set_reclaim_active(pg_data_t *pgdat, int highest_zoneidx)
+{
+ update_reclaim_active(pgdat, highest_zoneidx, true);
+}
+
+static inline void
+clear_reclaim_active(pg_data_t *pgdat, int highest_zoneidx)
+{
+ update_reclaim_active(pgdat, highest_zoneidx, false);
+}
+
/*
* For kswapd, balance_pgdat() will reclaim pages across a node from zones
* that are eligible for use by the caller until at least one zone is
boosted = nr_boost_reclaim;
restart:
+ set_reclaim_active(pgdat, highest_zoneidx);
sc.priority = DEF_PRIORITY;
do {
unsigned long nr_reclaimed = sc.nr_reclaimed;
pgdat->kswapd_failures++;
out:
+ clear_reclaim_active(pgdat, highest_zoneidx);
+
/* If reclaim was boosted, account for the reclaim done in this pass */
if (boosted) {
unsigned long flags;