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mm: memcontrol: introduce CONFIG_MEMCG_LEGACY_KMEM

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Let the user know that CONFIG_MEMCG_KMEM does not apply to the cgroup2
interface. This also makes legacy-only code sections stand out better.

[arnd@arndb.de: mm: memcontrol: only manage socket pressure for CONFIG_INET]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-01-20 15:02:41 -08:00 committed by Linus Torvalds
parent 04823c833b
commit 489c2a20a4
5 changed files with 23 additions and 13 deletions
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4
include/linux/memcontrol.h
View File

@ -233,7 +233,7 @@ struct mem_cgroup {
*/
struct mem_cgroup_stat_cpu __percpu *stat;
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET)
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
struct cg_proto tcp_mem;
#endif
#ifndef CONFIG_SLOB
@ -717,7 +717,7 @@ extern struct static_key_false memcg_sockets_enabled_key;
#define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
{
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_MEMCG_LEGACY_KMEM
if (memcg->tcp_mem.memory_pressure)
return true;
#endif

10
init/Kconfig
View File

@ -964,10 +964,13 @@ config MEMCG_SWAP_ENABLED
For those who want to have the feature enabled by default should
select this option (if, for some reason, they need to disable it
then swapaccount=0 does the trick).
config MEMCG_LEGACY_KMEM
bool
config MEMCG_KMEM
bool "Memory Resource Controller Kernel Memory accounting"
bool "Legacy Memory Resource Controller Kernel Memory accounting"
depends on MEMCG
depends on SLUB || SLAB
select MEMCG_LEGACY_KMEM
help
The Kernel Memory extension for Memory Resource Controller can limit
the amount of memory used by kernel objects in the system. Those are
@ -1071,6 +1074,11 @@ config CGROUP_FREEZER
Provides a way to freeze and unfreeze all tasks in a
cgroup.
This option affects the ORIGINAL cgroup interface. The cgroup2 memory
controller includes important in-kernel memory consumers per default.
If you're using cgroup2, say N.
config CGROUP_HUGETLB
bool "HugeTLB controller"
depends on HUGETLB_PAGE

18
mm/memcontrol.c
View File

@ -3001,7 +3001,7 @@ static void memcg_free_kmem(struct mem_cgroup *memcg)
}
#endif /* !CONFIG_SLOB */
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_MEMCG_LEGACY_KMEM
static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
unsigned long limit)
{
@ -3025,7 +3025,7 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
{
return -EINVAL;
}
#endif /* CONFIG_MEMCG_KMEM */
#endif /* CONFIG_MEMCG_LEGACY_KMEM */
/*
@ -4039,7 +4039,7 @@ static struct cftype mem_cgroup_legacy_files[] = {
.seq_show = memcg_numa_stat_show,
},
#endif
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_MEMCG_LEGACY_KMEM
{
.name = "kmem.limit_in_bytes",
.private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
@ -4266,13 +4266,13 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
if (ret)
return ret;
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_INET
#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);
#endif
@ -4329,7 +4329,7 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
memcg_free_kmem(memcg);
#ifdef CONFIG_MEMCG_KMEM
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
tcp_destroy_cgroup(memcg);
#endif
@ -5558,7 +5558,7 @@ void sock_update_memcg(struct sock *sk)
memcg = mem_cgroup_from_task(current);
if (memcg == root_mem_cgroup)
goto out;
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_MEMCG_LEGACY_KMEM
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcp_mem.active)
goto out;
#endif
@ -5587,7 +5587,7 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
{
gfp_t gfp_mask = GFP_KERNEL;
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_MEMCG_LEGACY_KMEM
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
struct page_counter *counter;
@ -5619,7 +5619,7 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
*/
void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
{
#ifdef CONFIG_MEMCG_KMEM
#ifdef CONFIG_MEMCG_LEGACY_KMEM
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
page_counter_uncharge(&memcg->tcp_mem.memory_allocated,
nr_pages);

2
mm/vmpressure.c
View File

@ -275,6 +275,7 @@ void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
level = vmpressure_calc_level(scanned, reclaimed);
#ifdef CONFIG_INET
if (level > VMPRESSURE_LOW) {
/*
* Let the socket buffer allocator know that
@ -286,6 +287,7 @@ void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
*/
memcg->socket_pressure = jiffies + HZ;
}
#endif
}
}

2
net/ipv4/Makefile
View File

@ -56,7 +56,7 @@ 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-$(CONFIG_MEMCG_KMEM) += tcp_memcontrol.o
obj-$(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 \