[PATCH] mm: restore user defined min_free_kbytes when disabling thp

[Han Pingtian]

thp increases the value of min_free_kbytes in initialization. This will
change the user defined value of min_free_kbytes sometimes. So try to
restore the value when disabling thp if the value has been changed in
thp initialization and isn't changed by user afte that.

Signed-off-by: Han Pingtian <hanpt@xxxxxxxxxxxxxxxxxx>
---
 mm/huge_memory.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 94a824f..fcb8ce58 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -164,6 +164,16 @@ static int start_khugepaged(void)
 	} else if (khugepaged_thread) {
 		kthread_stop(khugepaged_thread);
 		khugepaged_thread = NULL;
+
+		if (user_min_free_kbytes >= 0 && 
+		    user_min_free_kbytes != min_free_kbytes) {
+			pr_info("restore min_free_kbytes from %d to user "
+				"defined %d when stopping khugepaged\n",
+				min_free_kbytes, user_min_free_kbytes);
+
+			min_free_kbytes = user_min_free_kbytes;
+			setup_per_zone_wmarks();
+		}
 	}
 
 	return err;
-- 
1.7.7.6

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