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Message-Id: <1595681998-19193-16-git-send-email-alex.shi@linux.alibaba.com>
Date: Sat, 25 Jul 2020 20:59:52 +0800
From: Alex Shi <alex.shi@...ux.alibaba.com>
To: akpm@...ux-foundation.org, mgorman@...hsingularity.net,
tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
daniel.m.jordan@...cle.com, yang.shi@...ux.alibaba.com,
willy@...radead.org, hannes@...xchg.org, lkp@...el.com,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org, shakeelb@...gle.com,
iamjoonsoo.kim@....com, richard.weiyang@...il.com,
kirill@...temov.name, alexander.duyck@...il.com,
rong.a.chen@...el.com
Cc: Mika Penttilä <mika.penttila@...tfour.com>
Subject: [PATCH v17 15/21] mm/thp: add tail pages into lru anyway in split_huge_page()
Split_huge_page() must start with PageLRU(head), and we are holding the
lru_lock here. If the head was cleared lru bit unexpected, tracking it.
Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Kirill A. Shutemov <kirill@...temov.name>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Mika Penttilä <mika.penttila@...tfour.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
mm/huge_memory.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d866b6e43434..28538444197b 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2348,15 +2348,19 @@ static void lru_add_page_tail(struct page *head, struct page *page_tail,
VM_BUG_ON_PAGE(PageLRU(page_tail), head);
lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock);
- if (!list)
- SetPageLRU(page_tail);
-
- if (likely(PageLRU(head)))
- list_add_tail(&page_tail->lru, &head->lru);
- else if (list) {
+ if (list) {
/* page reclaim is reclaiming a huge page */
get_page(page_tail);
list_add_tail(&page_tail->lru, list);
+ } else {
+ /*
+ * Split start from PageLRU(head), and we are holding the
+ * lru_lock.
+ * Do a warning if the head's lru bit was cleared unexpected.
+ */
+ VM_WARN_ON(!PageLRU(head));
+ SetPageLRU(page_tail);
+ list_add_tail(&page_tail->lru, &head->lru);
}
}
--
1.8.3.1
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