linux-kernel - Re: [V5 PATCH 08/26] memcontrol: use N_MEMORY instead N_HIGH

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Date:	Mon, 29 Oct 2012 17:22:12 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Mel Gorman <mgorman@...e.de>, David Rientjes <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Yinghai Lu <yinghai@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	cgroups@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.linux-foundation.org
Subject: Re: [V5 PATCH 08/26] memcontrol: use N_MEMORY instead N_HIGH_MEMORY

On Mon 29-10-12 23:20:58, Lai Jiangshan wrote:
> N_HIGH_MEMORY stands for the nodes that has normal or high memory.
> N_MEMORY stands for the nodes that has any memory.

What is the difference of those two?

> The code here need to handle with the nodes which have memory, we should
> use N_MEMORY instead.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
>  mm/memcontrol.c  |   18 +++++++++---------
>  mm/page_cgroup.c |    2 +-
>  2 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 7acf43b..1b69665 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -800,7 +800,7 @@ static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
>  	int nid;
>  	u64 total = 0;
>  
> -	for_each_node_state(nid, N_HIGH_MEMORY)
> +	for_each_node_state(nid, N_MEMORY)
>  		total += mem_cgroup_node_nr_lru_pages(memcg, nid, lru_mask);
>  	return total;
>  }
> @@ -1611,9 +1611,9 @@ static void mem_cgroup_may_update_nodemask(struct mem_cgroup *memcg)
>  		return;
>  
>  	/* make a nodemask where this memcg uses memory from */
> -	memcg->scan_nodes = node_states[N_HIGH_MEMORY];
> +	memcg->scan_nodes = node_states[N_MEMORY];
>  
> -	for_each_node_mask(nid, node_states[N_HIGH_MEMORY]) {
> +	for_each_node_mask(nid, node_states[N_MEMORY]) {
>  
>  		if (!test_mem_cgroup_node_reclaimable(memcg, nid, false))
>  			node_clear(nid, memcg->scan_nodes);
> @@ -1684,7 +1684,7 @@ static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
>  	/*
>  	 * Check rest of nodes.
>  	 */
> -	for_each_node_state(nid, N_HIGH_MEMORY) {
> +	for_each_node_state(nid, N_MEMORY) {
>  		if (node_isset(nid, memcg->scan_nodes))
>  			continue;
>  		if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
> @@ -3759,7 +3759,7 @@ move_account:
>  		drain_all_stock_sync(memcg);
>  		ret = 0;
>  		mem_cgroup_start_move(memcg);
> -		for_each_node_state(node, N_HIGH_MEMORY) {
> +		for_each_node_state(node, N_MEMORY) {
>  			for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) {
>  				enum lru_list lru;
>  				for_each_lru(lru) {
> @@ -4087,7 +4087,7 @@ static int memcg_numa_stat_show(struct cgroup *cont, struct cftype *cft,
>  
>  	total_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL);
>  	seq_printf(m, "total=%lu", total_nr);
> -	for_each_node_state(nid, N_HIGH_MEMORY) {
> +	for_each_node_state(nid, N_MEMORY) {
>  		node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL);
>  		seq_printf(m, " N%d=%lu", nid, node_nr);
>  	}
> @@ -4095,7 +4095,7 @@ static int memcg_numa_stat_show(struct cgroup *cont, struct cftype *cft,
>  
>  	file_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL_FILE);
>  	seq_printf(m, "file=%lu", file_nr);
> -	for_each_node_state(nid, N_HIGH_MEMORY) {
> +	for_each_node_state(nid, N_MEMORY) {
>  		node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
>  				LRU_ALL_FILE);
>  		seq_printf(m, " N%d=%lu", nid, node_nr);
> @@ -4104,7 +4104,7 @@ static int memcg_numa_stat_show(struct cgroup *cont, struct cftype *cft,
>  
>  	anon_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL_ANON);
>  	seq_printf(m, "anon=%lu", anon_nr);
> -	for_each_node_state(nid, N_HIGH_MEMORY) {
> +	for_each_node_state(nid, N_MEMORY) {
>  		node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
>  				LRU_ALL_ANON);
>  		seq_printf(m, " N%d=%lu", nid, node_nr);
> @@ -4113,7 +4113,7 @@ static int memcg_numa_stat_show(struct cgroup *cont, struct cftype *cft,
>  
>  	unevictable_nr = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_UNEVICTABLE));
>  	seq_printf(m, "unevictable=%lu", unevictable_nr);
> -	for_each_node_state(nid, N_HIGH_MEMORY) {
> +	for_each_node_state(nid, N_MEMORY) {
>  		node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
>  				BIT(LRU_UNEVICTABLE));
>  		seq_printf(m, " N%d=%lu", nid, node_nr);
> diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
> index 5ddad0c..c1054ad 100644
> --- a/mm/page_cgroup.c
> +++ b/mm/page_cgroup.c
> @@ -271,7 +271,7 @@ void __init page_cgroup_init(void)
>  	if (mem_cgroup_disabled())
>  		return;
>  
> -	for_each_node_state(nid, N_HIGH_MEMORY) {
> +	for_each_node_state(nid, N_MEMORY) {
>  		unsigned long start_pfn, end_pfn;
>  
>  		start_pfn = node_start_pfn(nid);
> -- 
> 1.7.4.4
> 

-- 
Michal Hocko
SUSE Labs
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