From 76e0403d01980d5805e5ad51fa947114881f902b Mon Sep 17 00:00:00 2001
From: Yang Shi <yang.shi@linux.alibaba.com>
Date: Fri, 2 Aug 2019 02:06:35 +0800
Subject: [PATCH] alios: mm: vmscan: make it sane reclaim if cgwb_v1 is enabled

AliOS Cloud Kernel has cgroup writeback support for v1, so the reclaim could be
treated as sane reclaim if cgwb_v1 is enabled.

Reviewed-by: Gavin Shan <shan.gavin@linux.alibaba.com>
Reviewed-by: Xunlei Pang <xlpang@linux.alibaba.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Caspar Zhang <caspar@linux.alibaba.com>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
---
 mm/vmscan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 3e0f85a9ef4a..c58c0328903e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -260,7 +260,9 @@ static bool sane_reclaim(struct scan_control *sc)
 	if (!memcg)
 		return true;
 #ifdef CONFIG_CGROUP_WRITEBACK
-	if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
+	/* AliOS Cloud Kernel has cgroup writeback support for v1 */
+	if (cgroup_subsys_on_dfl(memory_cgrp_subsys) ||
+	    cgwb_v1)
 		return true;
 #endif
 	return false;
-- 
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