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mm: memcg: charge memcg percpu memory to the parent cgroup 

Memory cgroups are using large chunks of percpu memory to store vmstat
data.  Yet this memory is not accounted at all, so in the case when there
are many (dying) cgroups, it's not exactly clear where all the memory is.

Because the size of memory cgroup internal structures can dramatically
exceed the size of object or page which is pinning it in the memory, it's
not a good idea to simply ignore it.  It actually breaks the isolation
between cgroups.

Let's account the consumed percpu memory to the parent cgroup.

[guro@fb.com: add WARN_ON_ONCE()s, per Johannes]
  Link: http://lkml.kernel.org/r/20200811170611.GB1507044@carbon.DHCP.thefacebook.com

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Tobin C. Harding <tobin@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
Cc: Bixuan Cui <cuibixuan@huawei.com>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Link: http://lkml.kernel.org/r/20200623184515.4132564-5-guro@fb.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2020-08-11 18:30:25 -07:00 committed by Linus Torvalds
parent 772616b031
commit 3e38e0aaca
1 changed files with 16 additions and 4 deletions
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20
mm/memcontrol.c
View File

@ -5131,13 +5131,18 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
if (!pn)
return 1;
pn->lruvec_stat_local = alloc_percpu(struct lruvec_stat);
/* We charge the parent cgroup, never the current task */
WARN_ON_ONCE(!current->active_memcg);
pn->lruvec_stat_local = alloc_percpu_gfp(struct lruvec_stat,
GFP_KERNEL_ACCOUNT);
if (!pn->lruvec_stat_local) {
kfree(pn);
return 1;
}
pn->lruvec_stat_cpu = alloc_percpu(struct lruvec_stat);
pn->lruvec_stat_cpu = alloc_percpu_gfp(struct lruvec_stat,
GFP_KERNEL_ACCOUNT);
if (!pn->lruvec_stat_cpu) {
free_percpu(pn->lruvec_stat_local);
kfree(pn);
@ -5211,11 +5216,16 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
goto fail;
}
memcg->vmstats_local = alloc_percpu(struct memcg_vmstats_percpu);
/* We charge the parent cgroup, never the current task */
WARN_ON_ONCE(!current->active_memcg);
memcg->vmstats_local = alloc_percpu_gfp(struct memcg_vmstats_percpu,
GFP_KERNEL_ACCOUNT);
if (!memcg->vmstats_local)
goto fail;
memcg->vmstats_percpu = alloc_percpu(struct memcg_vmstats_percpu);
memcg->vmstats_percpu = alloc_percpu_gfp(struct memcg_vmstats_percpu,
GFP_KERNEL_ACCOUNT);
if (!memcg->vmstats_percpu)
goto fail;
@ -5264,7 +5274,9 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
struct mem_cgroup *memcg;
long error = -ENOMEM;
memalloc_use_memcg(parent);
memcg = mem_cgroup_alloc();
memalloc_unuse_memcg();
if (IS_ERR(memcg))
return ERR_CAST(memcg);