linux-kernel - [PATCH 1/2] mm, frontswap: Fix frontswap

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Date:   Tue, 15 Oct 2019 11:49:08 +0800
From:   Hui Zhu <teawater@...il.com>
To:     konrad.wilk@...cle.com, sjenning@...hat.com, ddstreet@...e.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Hui Zhu <teawater@...il.com>, Hui Zhu <teawaterz@...ux.alibaba.com>
Subject: [PATCH 1/2] mm, frontswap: Fix frontswap_map issue with THP

Shrink will try to use frontswap interface store the THP as a normal
page in __frontswap_store:
	if (ret == 0) {
		__frontswap_set(sis, offset);
		inc_frontswap_succ_stores();
	} else {
It should set all bits with THP.

This commit set all bits with THP.

Signed-off-by: Hui Zhu <teawaterz@...ux.alibaba.com>
---
 mm/frontswap.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/frontswap.c b/mm/frontswap.c
index 60bb20e..f07ea63 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -274,8 +274,12 @@ int __frontswap_store(struct page *page)
 			break;
 	}
 	if (ret == 0) {
-		__frontswap_set(sis, offset);
-		inc_frontswap_succ_stores();
+		int i, nr = hpage_nr_pages(page);
+
+		for (i = 0; i < nr; i++) {
+			__frontswap_set(sis, offset + i);
+			inc_frontswap_succ_stores();
+		}
 	} else {
 		inc_frontswap_failed_stores();
 	}
-- 
2.7.4