Commit 425bce98 authored by Chen Wandun's avatar Chen Wandun Committed by Zheng Zengkai
Browse files

mm/page_cache_limit: calculate reclaim pages for each node 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4HOXK



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

In NUMA system, each node may have different pages, so pages that to
reclaim should be calculated separately when the number of page cache
beyond page cache limit.

Signed-off-by: default avatarChen Wandun <chenwandun@huawei.com>
Reviewed-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent b072a9d4

mm/page_cache_limit.c

+51 −1
Original line number Diff line number Diff line
@@ -104,10 +104,60 @@ 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)

{

	if (!pagecache_overlimit())

	int nid;



	if (!pagecache_reclaim_enable || !pagecache_overlimit())

		return;



	for_each_node_state(nid, N_MEMORY)

		shrink_node_page_cache(nid);

}



static DECLARE_COMPLETION(setup_done);