From 94ee86c704ea611690df3a60bc785c0eecb0bd5b Mon Sep 17 00:00:00 2001
From: Chen Wandun <chenwandun@huawei.com>
Date: Wed, 9 Feb 2022 15:36:36 +0800
Subject: [PATCH] mm/vmscan: dont reclaim anon page when shrink page cache

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

--------------------------------

The number of page cache should be limited in a range if
enable CONFIG_MEMORY_RELIABLE, so only page cache instead
of both file + anono page should be reclaimed during page
cache reclaimtion.

Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 mm/vmscan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 39b06e6eaa0f..a9fca07dba3b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -56,6 +56,7 @@
 
 #include <linux/swapops.h>
 #include <linux/balloon_compaction.h>
+#include <linux/mem_reliable.h>
 
 #include "internal.h"
 
@@ -3968,7 +3969,7 @@ static unsigned long __shrink_page_cache(gfp_t mask)
 		.nr_to_reclaim = SWAP_CLUSTER_MAX *
 				 (unsigned long)vm_cache_reclaim_weight,
 		.may_unmap = 1,
-		.may_swap = 1,
+		.may_swap = mem_reliable_is_enabled() ? 0 : 1,
 		.order = 0,
 		.priority = DEF_PRIORITY,
 		.target_mem_cgroup = NULL,
-- 
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