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Subject[PATCHv2 3/8] khugepaged: Drain all LRU caches before scanning pages
Date
Having a page in LRU add cache offsets page refcount and gives
false-negative on PageLRU(). It reduces collapse success rate.

Drain all LRU add caches before scanning. It happens relatively
rare and should not disturb the system too much.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/khugepaged.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 14d7afc90786..fdc10ffde1ca 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2065,6 +2065,8 @@ static void khugepaged_do_scan(void)

barrier(); /* write khugepaged_pages_to_scan to local stack */

+ lru_add_drain_all();
+
while (progress < pages) {
if (!khugepaged_prealloc_page(&hpage, &wait))
break;
--
2.26.0
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