Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCH 3/6] khugepaged: Drain all LRU caches before scanning pages | Date | Mon, 13 Apr 2020 13:04:44 +0300 |
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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 5968ec5ddd6b..ee66c140c2d6 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2059,6 +2059,8 @@ 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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