Revert "mm/page_cache_limit: calculate reclaim pages for each node"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4HOXK
CVE: NA

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

This reverts commit 425bce98.
This feature will be reimplement.
Signed-off-by: NChen Wandun <chenwandun@huawei.com>
Reviewed-by: NTong Tiangen <tongtiangen@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

mm/page_cache_limit.c

@@ -104,60 +104,10 @@ void wakeup_all_kpagecache_limitd(void)
 		wakeup_kpagecache_limitd(nid);
 }
 
-static unsigned long node_nr_page_cache(int nid)
-{
-	struct pglist_data *pgdat;
-	unsigned long num = 0;
-
-	pgdat = NODE_DATA(nid);
-	if (!pgdat)
-		return 0;
-
-	num = node_page_state(pgdat, NR_FILE_PAGES);
-	num -= node_page_state(pgdat, NR_SHMEM);
-
-	return num;
-}
-
-static unsigned long node_nr_page_reclaim(int nid)
-{
-	unsigned long nr_page_cache;
-	unsigned long nr_to_reclaim;
-	unsigned long total_pages;
-
-	if (!node_pagecache_limit_pages[nid])
-		return 0;
-
-	nr_page_cache = node_nr_page_cache(nid);
-	if (!nr_page_cache)
-		return 0;
-
-	if (nr_page_cache < node_pagecache_limit_pages[nid])
-		return 0;
-
-	total_pages = get_node_total_pages(nid);
-	nr_to_reclaim = nr_page_cache - node_pagecache_limit_pages[nid];
-	nr_to_reclaim += total_pages * pagecache_reclaim_ratio / 100;
-
-	return nr_to_reclaim;
-}
-
-static void shrink_node_page_cache(int nid)
-{
-	unsigned long nr_to_reclaim;
-
-	nr_to_reclaim = node_nr_page_reclaim(nid);
-}
-
 static void shrink_page_cache(void)
 {
-	int nid;
-
-	if (!pagecache_reclaim_enable || !pagecache_overlimit())
+	if (!pagecache_overlimit())
 		return;
-
-	for_each_node_state(nid, N_MEMORY)
-		shrink_node_page_cache(nid);
 }
 
 static DECLARE_COMPLETION(setup_done);