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Message-ID: <20151211132328.GD32318@dhcp22.suse.cz>
Date: Fri, 11 Dec 2015 14:23:28 +0100
From: Michal Hocko <mhocko@...nel.org>
To: Vladimir Davydov <vdavydov@...tuozzo.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] net: drop tcp_memcontrol.c
On Wed 09-12-15 15:50:00, Vladimir Davydov wrote:
> tcp_memcontrol.c only contains legacy memory.tcp.kmem.* file definitions
> and mem_cgroup->tcp_mem init/destroy stuff. This doesn't belong to
> network subsys. Let's move it to memcontrol.c. This also allows us to
> reuse generic code for handling legacy memcg files.
>
> Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
Acked-by: Michal Hocko <mhocko@...e.com>
> ---
> include/net/tcp_memcontrol.h | 7 --
> mm/memcontrol.c | 104 +++++++++++++++++++---
> net/ipv4/Makefile | 1 -
> net/ipv4/sysctl_net_ipv4.c | 1 -
> net/ipv4/tcp_ipv4.c | 1 -
> net/ipv4/tcp_memcontrol.c | 200 -------------------------------------------
> net/ipv6/tcp_ipv6.c | 1 -
> 7 files changed, 93 insertions(+), 222 deletions(-)
> delete mode 100644 include/net/tcp_memcontrol.h
> delete mode 100644 net/ipv4/tcp_memcontrol.c
>
> diff --git a/include/net/tcp_memcontrol.h b/include/net/tcp_memcontrol.h
> deleted file mode 100644
> index dc2da2f8c8b2..000000000000
> --- a/include/net/tcp_memcontrol.h
> +++ /dev/null
> @@ -1,7 +0,0 @@
> -#ifndef _TCP_MEMCG_H
> -#define _TCP_MEMCG_H
> -
> -int tcp_init_cgroup(struct mem_cgroup *memcg);
> -void tcp_destroy_cgroup(struct mem_cgroup *memcg);
> -
> -#endif /* _TCP_MEMCG_H */
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 810ba0929a18..7f5c6abf5421 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -66,7 +66,6 @@
> #include "internal.h"
> #include <net/sock.h>
> #include <net/ip.h>
> -#include <net/tcp_memcontrol.h>
> #include "slab.h"
>
> #include <asm/uaccess.h>
> @@ -242,6 +241,7 @@ enum res_type {
> _MEMSWAP,
> _OOM_TYPE,
> _KMEM,
> + _TCP,
> };
>
> #define MEMFILE_PRIVATE(x, val) ((x) << 16 | (val))
> @@ -2816,6 +2816,11 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
> case _KMEM:
> counter = &memcg->kmem;
> break;
> +#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
> + case _TCP:
> + counter = &memcg->tcp_mem.memory_allocated;
> + break;
> +#endif
> default:
> BUG();
> }
> @@ -2988,6 +2993,48 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
> }
> #endif /* CONFIG_MEMCG_LEGACY_KMEM */
>
> +#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
> +static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit)
> +{
> + int ret;
> +
> + mutex_lock(&memcg_limit_mutex);
> +
> + ret = page_counter_limit(&memcg->tcp_mem.memory_allocated, limit);
> + if (ret)
> + goto out;
> +
> + if (!memcg->tcp_mem.active) {
> + /*
> + * The active flag needs to be written after the static_key
> + * update. This is what guarantees that the socket activation
> + * function is the last one to run. See sock_update_memcg() for
> + * details, and note that we don't mark any socket as belonging
> + * to this memcg until that flag is up.
> + *
> + * We need to do this, because static_keys will span multiple
> + * sites, but we can't control their order. If we mark a socket
> + * as accounted, but the accounting functions are not patched in
> + * yet, we'll lose accounting.
> + *
> + * We never race with the readers in sock_update_memcg(),
> + * because when this value change, the code to process it is not
> + * patched in yet.
> + */
> + static_branch_inc(&memcg_sockets_enabled_key);
> + memcg->tcp_mem.active = true;
> + }
> +out:
> + mutex_unlock(&memcg_limit_mutex);
> + return ret;
> +}
> +#else
> +static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit)
> +{
> + return -EINVAL;
> +}
> +#endif /* CONFIG_MEMCG_LEGACY_KMEM && CONFIG_INET */
> +
> /*
> * The user of this function is...
> * RES_LIMIT.
> @@ -3020,6 +3067,9 @@ static ssize_t mem_cgroup_write(struct kernfs_open_file *of,
> case _KMEM:
> ret = memcg_update_kmem_limit(memcg, nr_pages);
> break;
> + case _TCP:
> + ret = memcg_update_tcp_limit(memcg, nr_pages);
> + break;
> }
> break;
> case RES_SOFT_LIMIT:
> @@ -3046,6 +3096,11 @@ static ssize_t mem_cgroup_reset(struct kernfs_open_file *of, char *buf,
> case _KMEM:
> counter = &memcg->kmem;
> break;
> +#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
> + case _TCP:
> + counter = &memcg->tcp_mem.memory_allocated;
> + break;
> +#endif
> default:
> BUG();
> }
> @@ -4031,6 +4086,31 @@ static struct cftype mem_cgroup_legacy_files[] = {
> .seq_show = memcg_slab_show,
> },
> #endif
> +#ifdef CONFIG_INET
> + {
> + .name = "kmem.tcp.limit_in_bytes",
> + .private = MEMFILE_PRIVATE(_TCP, RES_LIMIT),
> + .write = mem_cgroup_write,
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + {
> + .name = "kmem.tcp.usage_in_bytes",
> + .private = MEMFILE_PRIVATE(_TCP, RES_USAGE),
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + {
> + .name = "kmem.tcp.failcnt",
> + .private = MEMFILE_PRIVATE(_TCP, RES_FAILCNT),
> + .write = mem_cgroup_reset,
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + {
> + .name = "kmem.tcp.max_usage_in_bytes",
> + .private = MEMFILE_PRIVATE(_TCP, RES_MAX_USAGE),
> + .write = mem_cgroup_reset,
> + .read_u64 = mem_cgroup_read_u64,
> + },
> +#endif
> #endif
> { }, /* terminate */
> };
> @@ -4198,6 +4278,10 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
> memcg->soft_limit = PAGE_COUNTER_MAX;
> page_counter_init(&memcg->memsw, &parent->memsw);
> page_counter_init(&memcg->kmem, &parent->kmem);
> +#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
> + page_counter_init(&memcg->tcp_mem.memory_allocated,
> + &parent->tcp_mem.memory_allocated);
> +#endif
>
> /*
> * No need to take a reference to the parent because cgroup
> @@ -4209,6 +4293,9 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
> memcg->soft_limit = PAGE_COUNTER_MAX;
> page_counter_init(&memcg->memsw, NULL);
> page_counter_init(&memcg->kmem, NULL);
> +#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
> + page_counter_init(&memcg->tcp_mem.memory_allocated, NULL);
> +#endif
> /*
> * Deeper hierachy with use_hierarchy == false doesn't make
> * much sense so let cgroup subsystem know about this
> @@ -4223,12 +4310,6 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
> if (ret)
> return ret;
>
> -#ifdef CONFIG_MEMCG_LEGACY_KMEM
> - ret = tcp_init_cgroup(memcg);
> - if (ret)
> - return ret;
> -#endif
> -
> #ifdef CONFIG_INET
> if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket)
> static_branch_inc(&memcg_sockets_enabled_key);
> @@ -4277,12 +4358,13 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
> static_branch_dec(&memcg_sockets_enabled_key);
> #endif
>
> - memcg_free_kmem(memcg);
> -
> -#ifdef CONFIG_MEMCG_LEGACY_KMEM
> - tcp_destroy_cgroup(memcg);
> +#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
> + if (memcg->tcp_mem.active)
> + static_branch_dec(&memcg_sockets_enabled_key);
> #endif
>
> + memcg_free_kmem(memcg);
> +
> __mem_cgroup_free(memcg);
> }
>
> diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
> index bee5055832a1..62c049b647e9 100644
> --- a/net/ipv4/Makefile
> +++ b/net/ipv4/Makefile
> @@ -56,7 +56,6 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o
> obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
> obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
> obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
> -obj-$(CONFIG_MEMCG_LEGACY_KMEM) += tcp_memcontrol.o
> obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
>
> obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
> diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
> index a0bd7a55193e..108105570106 100644
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -24,7 +24,6 @@
> #include <net/cipso_ipv4.h>
> #include <net/inet_frag.h>
> #include <net/ping.h>
> -#include <net/tcp_memcontrol.h>
>
> static int zero;
> static int one = 1;
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index 34c26782e114..88019dc902d7 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -73,7 +73,6 @@
> #include <net/timewait_sock.h>
> #include <net/xfrm.h>
> #include <net/secure_seq.h>
> -#include <net/tcp_memcontrol.h>
> #include <net/busy_poll.h>
>
> #include <linux/inet.h>
> diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
> deleted file mode 100644
> index 133eb5eac49f..000000000000
> --- a/net/ipv4/tcp_memcontrol.c
> +++ /dev/null
> @@ -1,200 +0,0 @@
> -#include <net/tcp.h>
> -#include <net/tcp_memcontrol.h>
> -#include <net/sock.h>
> -#include <net/ip.h>
> -#include <linux/nsproxy.h>
> -#include <linux/memcontrol.h>
> -#include <linux/module.h>
> -
> -int tcp_init_cgroup(struct mem_cgroup *memcg)
> -{
> - struct mem_cgroup *parent = parent_mem_cgroup(memcg);
> - struct page_counter *counter_parent = NULL;
> - /*
> - * The root cgroup does not use page_counters, but rather,
> - * rely on the data already collected by the network
> - * subsystem
> - */
> - if (memcg == root_mem_cgroup)
> - return 0;
> -
> - memcg->tcp_mem.memory_pressure = 0;
> -
> - if (parent)
> - counter_parent = &parent->tcp_mem.memory_allocated;
> -
> - page_counter_init(&memcg->tcp_mem.memory_allocated, counter_parent);
> -
> - return 0;
> -}
> -
> -void tcp_destroy_cgroup(struct mem_cgroup *memcg)
> -{
> - if (memcg == root_mem_cgroup)
> - return;
> -
> - if (memcg->tcp_mem.active)
> - static_branch_dec(&memcg_sockets_enabled_key);
> -}
> -
> -static int tcp_update_limit(struct mem_cgroup *memcg, unsigned long nr_pages)
> -{
> - int ret;
> -
> - if (memcg == root_mem_cgroup)
> - return -EINVAL;
> -
> - ret = page_counter_limit(&memcg->tcp_mem.memory_allocated, nr_pages);
> - if (ret)
> - return ret;
> -
> - if (!memcg->tcp_mem.active) {
> - /*
> - * The active flag needs to be written after the static_key
> - * update. This is what guarantees that the socket activation
> - * function is the last one to run. See sock_update_memcg() for
> - * details, and note that we don't mark any socket as belonging
> - * to this memcg until that flag is up.
> - *
> - * We need to do this, because static_keys will span multiple
> - * sites, but we can't control their order. If we mark a socket
> - * as accounted, but the accounting functions are not patched in
> - * yet, we'll lose accounting.
> - *
> - * We never race with the readers in sock_update_memcg(),
> - * because when this value change, the code to process it is not
> - * patched in yet.
> - */
> - static_branch_inc(&memcg_sockets_enabled_key);
> - memcg->tcp_mem.active = true;
> - }
> -
> - return 0;
> -}
> -
> -enum {
> - RES_USAGE,
> - RES_LIMIT,
> - RES_MAX_USAGE,
> - RES_FAILCNT,
> -};
> -
> -static DEFINE_MUTEX(tcp_limit_mutex);
> -
> -static ssize_t tcp_cgroup_write(struct kernfs_open_file *of,
> - char *buf, size_t nbytes, loff_t off)
> -{
> - struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
> - unsigned long nr_pages;
> - int ret = 0;
> -
> - buf = strstrip(buf);
> -
> - switch (of_cft(of)->private) {
> - case RES_LIMIT:
> - /* see memcontrol.c */
> - ret = page_counter_memparse(buf, "-1", &nr_pages);
> - if (ret)
> - break;
> - mutex_lock(&tcp_limit_mutex);
> - ret = tcp_update_limit(memcg, nr_pages);
> - mutex_unlock(&tcp_limit_mutex);
> - break;
> - default:
> - ret = -EINVAL;
> - break;
> - }
> - return ret ?: nbytes;
> -}
> -
> -static u64 tcp_cgroup_read(struct cgroup_subsys_state *css, struct cftype *cft)
> -{
> - struct mem_cgroup *memcg = mem_cgroup_from_css(css);
> - u64 val;
> -
> - switch (cft->private) {
> - case RES_LIMIT:
> - if (memcg == root_mem_cgroup)
> - val = PAGE_COUNTER_MAX;
> - else
> - val = memcg->tcp_mem.memory_allocated.limit;
> - val *= PAGE_SIZE;
> - break;
> - case RES_USAGE:
> - if (memcg == root_mem_cgroup)
> - val = atomic_long_read(&tcp_memory_allocated);
> - else
> - val = page_counter_read(&memcg->tcp_mem.memory_allocated);
> - val *= PAGE_SIZE;
> - break;
> - case RES_FAILCNT:
> - if (memcg == root_mem_cgroup)
> - return 0;
> - val = memcg->tcp_mem.memory_allocated.failcnt;
> - break;
> - case RES_MAX_USAGE:
> - if (memcg == root_mem_cgroup)
> - return 0;
> - val = memcg->tcp_mem.memory_allocated.watermark;
> - val *= PAGE_SIZE;
> - break;
> - default:
> - BUG();
> - }
> - return val;
> -}
> -
> -static ssize_t tcp_cgroup_reset(struct kernfs_open_file *of,
> - char *buf, size_t nbytes, loff_t off)
> -{
> - struct mem_cgroup *memcg;
> -
> - memcg = mem_cgroup_from_css(of_css(of));
> - if (memcg == root_mem_cgroup)
> - return nbytes;
> -
> - switch (of_cft(of)->private) {
> - case RES_MAX_USAGE:
> - page_counter_reset_watermark(&memcg->tcp_mem.memory_allocated);
> - break;
> - case RES_FAILCNT:
> - memcg->tcp_mem.memory_allocated.failcnt = 0;
> - break;
> - }
> -
> - return nbytes;
> -}
> -
> -static struct cftype tcp_files[] = {
> - {
> - .name = "kmem.tcp.limit_in_bytes",
> - .write = tcp_cgroup_write,
> - .read_u64 = tcp_cgroup_read,
> - .private = RES_LIMIT,
> - },
> - {
> - .name = "kmem.tcp.usage_in_bytes",
> - .read_u64 = tcp_cgroup_read,
> - .private = RES_USAGE,
> - },
> - {
> - .name = "kmem.tcp.failcnt",
> - .private = RES_FAILCNT,
> - .write = tcp_cgroup_reset,
> - .read_u64 = tcp_cgroup_read,
> - },
> - {
> - .name = "kmem.tcp.max_usage_in_bytes",
> - .private = RES_MAX_USAGE,
> - .write = tcp_cgroup_reset,
> - .read_u64 = tcp_cgroup_read,
> - },
> - { } /* terminate */
> -};
> -
> -static int __init tcp_memcontrol_init(void)
> -{
> - WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys, tcp_files));
> - return 0;
> -}
> -__initcall(tcp_memcontrol_init);
> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index 1bfb68203f92..894fbfb903af 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -61,7 +61,6 @@
> #include <net/timewait_sock.h>
> #include <net/inet_common.h>
> #include <net/secure_seq.h>
> -#include <net/tcp_memcontrol.h>
> #include <net/busy_poll.h>
>
> #include <linux/proc_fs.h>
> --
> 2.1.4
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@...ck.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
--
Michal Hocko
SUSE Labs
--
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