add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/drop_caches.c
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@@ -9,6 +9,7 @@
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 #include <linux/writeback.h>
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 #include <linux/sysctl.h>
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 #include <linux/gfp.h>
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+#include <linux/swap.h>
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 #include "internal.h"
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 /* A global variable is a bit ugly, but it keeps the code simple */
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@@ -58,6 +59,7 @@
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 		static int stfu;
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 		if (sysctl_drop_caches & 1) {
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+			lru_add_drain_all();
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 			iterate_supers(drop_pagecache_sb, NULL);
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 			count_vm_event(DROP_PAGECACHE);
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 		}