netdev - Re: [PATCH v6 04/10] Account tcp memory as kernel memory

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Message-Id: <20111128121418.b66469bf.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 28 Nov 2011 12:14:18 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, lizf@...fujitsu.com,
	ebiederm@...ssion.com, davem@...emloft.net, paul@...lmenage.org,
	gthelen@...gle.com, netdev@...r.kernel.org, linux-mm@...ck.org,
	kirill@...temov.name, avagin@...allels.com, devel@...nvz.org,
	eric.dumazet@...il.com, cgroups@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujtisu.com>
Subject: Re: [PATCH v6 04/10] Account tcp memory as kernel memory


Some nitpicks.

On Fri, 25 Nov 2011 15:38:10 -0200
Glauber Costa <glommer@...allels.com> wrote:

> Now that we account and control tcp memory buffers memory for pressure
> controlling purposes, display this information as part of the normal memcg
> files and other usages.
> 
 
> +extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
> +extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
> +
>  static inline
>  int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
>  {
> diff --git a/include/net/sock.h b/include/net/sock.h
> index d802761..da38de2 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -65,6 +65,9 @@
>  #include <net/dst.h>
>  #include <net/checksum.h>
>  
> +int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss);
> +void sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss);
> +
>  /*

Hmm, what is this 'populate' function for ?
mem_cgroup_sockets_init() ?



>   * This structure really needs to be cleaned up.
>   * Most of it is for TCP, and not used by any of
> diff --git a/include/net/tcp_memcg.h b/include/net/tcp_memcg.h
> new file mode 100644
> index 0000000..5f5e158
> --- /dev/null
> +++ b/include/net/tcp_memcg.h
> @@ -0,0 +1,17 @@
> +#ifndef _TCP_MEMCG_H
> +#define _TCP_MEMCG_H
> +
> +struct tcp_memcontrol {
> +	struct cg_proto cg_proto;
> +	/* per-cgroup tcp memory pressure knobs */
> +	struct res_counter tcp_memory_allocated;
> +	struct percpu_counter tcp_sockets_allocated;
> +	/* those two are read-mostly, leave them at the end */
> +	long tcp_prot_mem[3];
> +	int tcp_memory_pressure;
> +};
> +
> +struct cg_proto *tcp_proto_cgroup(struct mem_cgroup *memcg);
> +int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss);
> +void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss);
> +#endif /* _TCP_MEMCG_H */
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 5f29194..2df5d3c 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -49,6 +49,8 @@
>  #include <linux/cpu.h>
>  #include <linux/oom.h>
>  #include "internal.h"
> +#include <net/sock.h>
> +#include <net/tcp_memcg.h>

ok, tcp_memcg.h ... some other men may like tcp_memcontrol.h..

>  
>  #include <asm/uaccess.h>
>  
<snip>

>  static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
> @@ -4954,7 +4983,7 @@ static void mem_cgroup_put(struct mem_cgroup *mem)
>  /*
>   * Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled.
>   */
> -static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem)
> +struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem)
>  {
>  	if (!mem->res.parent)
>  		return NULL;
> @@ -5037,6 +5066,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
>  		res_counter_init(&mem->res, &parent->res);
>  		res_counter_init(&mem->memsw, &parent->memsw);
>  		res_counter_init(&mem->kmem, &parent->kmem);
> +

unnecessary blank line.


>  		/*
>  		 * We increment refcnt of the parent to ensure that we can
>  		 * safely access it on res_counter_charge/uncharge.
> @@ -5053,6 +5083,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
>  	mem->last_scanned_node = MAX_NUMNODES;
>  	INIT_LIST_HEAD(&mem->oom_notify);
>  
> +
ditto.

<snip>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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