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From: "Michal Koutný" <mkoutny@suse.com>
To: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Vasily Averin <vvs@openvz.org>, Vlastimil Babka <vbabka@suse.cz>,
	Shakeel Butt <shakeelb@google.com>,
	kernel@openvz.org, Florian Westphal <fw@strlen.de>,
	linux-kernel@vger.kernel.org, Michal Hocko <mhocko@suse.com>,
	cgroups@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Tejun Heo <tj@kernel.org>
Subject: Re: kernfs memcg accounting
Date: Wed, 11 May 2022 18:34:39 +0200	[thread overview]
Message-ID: <20220511163439.GD24172@blackbody.suse.cz> (raw)
In-Reply-To: <YnsoMEuWjlpDcmt3@carbon>

On Tue, May 10, 2022 at 08:06:24PM -0700, Roman Gushchin <roman.gushchin@linux.dev> wrote:
> My primary goal was to apply the memory pressure on memory cgroups with a lot
> of (dying) children cgroups. On a multi-cpu machine a memory cgroup structure
> is way larger than a page, so a cgroup which looks small can be really large
> if we calculate the amount of memory taken by all children memcg internals.
> 
> Applying this pressure to another cgroup (e.g. the one which contains systemd)
> doesn't help to reclaim any pages which are pinning the dying cgroups.

Just a note -- this another usecase of cgroups created from within the
subtree (e.g. a container). I agree that cgroup-manager/systemd case is
also valid (as dying memcgs may accumulate after a restart).

memcgs with their retained state with footprint are special.

> For other controllers (maybe blkcg aside, idk) it shouldn't matter, because
> there is no such problem there.
> 
> For consistency reasons I'd suggest to charge all *large* allocations
> (e.g. percpu) to the parent cgroup. Small allocations can be ignored.

Strictly speaking, this would mean that any controller would have on
implicit dependency on the memory controller (such as io controller
has).
In the extreme case even controller-less hierarchy would have such a
requirement (for precise kernfs_node accounting).
Such a dependency is not enforceable on v1 (with various topologies of
different hierarchies).
Although, I initially favored the consistency with memory controller too,
I think it's simpler to charge to the creator's memcg to achieve
consistency across v1 and v2 :-) 

Michal

WARNING: multiple messages have this Message-ID (diff)
From: "Michal Koutný" <mkoutny-IBi9RG/b67k@public.gmane.org>
To: Roman Gushchin <roman.gushchin-fxUVXftIFDnyG1zEObXtfA@public.gmane.org>
Cc: Vasily Averin <vvs-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
	Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>,
	Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	kernel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org,
	Florian Westphal <fw-HFFVJYpyMKqzQB+pC5nmwQ@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org>,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Greg Kroah-Hartman
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: kernfs memcg accounting
Date: Wed, 11 May 2022 18:34:39 +0200	[thread overview]
Message-ID: <20220511163439.GD24172@blackbody.suse.cz> (raw)
In-Reply-To: <YnsoMEuWjlpDcmt3@carbon>

On Tue, May 10, 2022 at 08:06:24PM -0700, Roman Gushchin <roman.gushchin-fxUVXftIFDnyG1zEObXtfA@public.gmane.org> wrote:
> My primary goal was to apply the memory pressure on memory cgroups with a lot
> of (dying) children cgroups. On a multi-cpu machine a memory cgroup structure
> is way larger than a page, so a cgroup which looks small can be really large
> if we calculate the amount of memory taken by all children memcg internals.
> 
> Applying this pressure to another cgroup (e.g. the one which contains systemd)
> doesn't help to reclaim any pages which are pinning the dying cgroups.

Just a note -- this another usecase of cgroups created from within the
subtree (e.g. a container). I agree that cgroup-manager/systemd case is
also valid (as dying memcgs may accumulate after a restart).

memcgs with their retained state with footprint are special.

> For other controllers (maybe blkcg aside, idk) it shouldn't matter, because
> there is no such problem there.
> 
> For consistency reasons I'd suggest to charge all *large* allocations
> (e.g. percpu) to the parent cgroup. Small allocations can be ignored.

Strictly speaking, this would mean that any controller would have on
implicit dependency on the memory controller (such as io controller
has).
In the extreme case even controller-less hierarchy would have such a
requirement (for precise kernfs_node accounting).
Such a dependency is not enforceable on v1 (with various topologies of
different hierarchies).
Although, I initially favored the consistency with memory controller too,
I think it's simpler to charge to the creator's memcg to achieve
consistency across v1 and v2 :-) 

Michal

  parent reply	other threads:[~2022-05-11 16:34 UTC|newest]

Thread overview: 267+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-27 10:37 [PATCH] memcg: accounting for objects allocated for new netdevice Vasily Averin
2022-04-27 10:37 ` Vasily Averin
2022-04-27 14:01 ` Michal Koutný
2022-04-27 14:01   ` Michal Koutný
2022-04-27 16:52   ` Shakeel Butt
2022-04-27 16:52     ` Shakeel Butt
2022-04-27 22:35     ` Vasily Averin
2022-04-27 22:35       ` Vasily Averin
2022-05-02 12:15       ` [PATCH memcg v2] " Vasily Averin
2022-05-04 20:50         ` Luis Chamberlain
2022-05-04 20:50           ` Luis Chamberlain
2022-05-05  3:50         ` patchwork-bot+netdevbpf
2022-05-05  3:50           ` patchwork-bot+netdevbpf-DgEjT+Ai2ygdnm+yROfE0A
2022-05-11  2:51         ` Roman Gushchin
2022-05-11  2:51           ` Roman Gushchin
2022-05-02 19:37   ` kernfs memcg accounting Vasily Averin
2022-05-02 19:37     ` Vasily Averin
2022-05-02 21:22     ` Michal Koutný
2022-05-02 21:22       ` Michal Koutný
2022-05-04  9:00       ` Vasily Averin
2022-05-04  9:00         ` Vasily Averin
2022-05-04 14:10         ` Michal Koutný
2022-05-04 14:10           ` Michal Koutný
2022-05-04 21:16           ` Vasily Averin
2022-05-04 21:16             ` Vasily Averin
2022-05-05  9:47             ` Michal Koutný
2022-05-05  9:47               ` Michal Koutný
2022-05-06  8:37               ` Vasily Averin
2022-05-06  8:37                 ` Vasily Averin
2022-05-11  3:06         ` Roman Gushchin
2022-05-11  3:06           ` Roman Gushchin
2022-05-11  6:01           ` Vasily Averin
2022-05-11  6:01             ` Vasily Averin
2022-05-11 16:49             ` Michal Koutný
2022-05-11 16:49               ` Michal Koutný
2022-05-11 17:46             ` Roman Gushchin
2022-05-11 17:46               ` Roman Gushchin
2022-05-11 16:34           ` Michal Koutný [this message]
2022-05-11 16:34             ` Michal Koutný
2022-05-11 18:10             ` Roman Gushchin
2022-05-11 18:10               ` Roman Gushchin
2022-05-13 15:51               ` [PATCH 0/4] memcg: accounting for objects allocated by mkdir cgroup Vasily Averin
2022-05-13 15:51                 ` Vasily Averin
2022-05-13 17:49                 ` Roman Gushchin
2022-05-13 17:49                   ` Roman Gushchin
2022-05-21 16:37                   ` [PATCH mm v2 0/9] " Vasily Averin
2022-05-21 16:37                     ` Vasily Averin
2022-05-30 11:25                     ` [PATCH mm v3 " Vasily Averin
2022-05-30 11:25                       ` Vasily Averin
2022-05-30 11:55                       ` Michal Hocko
2022-05-30 11:55                         ` Michal Hocko
2022-05-30 13:09                         ` Vasily Averin
2022-05-30 13:09                           ` Vasily Averin
2022-05-30 14:22                           ` Michal Hocko
2022-05-30 14:22                             ` Michal Hocko
2022-05-30 19:58                             ` Vasily Averin
2022-05-30 19:58                               ` Vasily Averin
2022-05-31  7:16                               ` Michal Hocko
2022-05-31  7:16                                 ` Michal Hocko
2022-06-01  3:43                                 ` Vasily Averin
2022-06-01  3:43                                   ` Vasily Averin
2022-06-01  9:15                                   ` Michal Koutný
2022-06-01  9:15                                     ` Michal Koutný
2022-06-01  9:32                                     ` Michal Hocko
2022-06-01  9:32                                       ` Michal Hocko
2022-06-01 13:05                                       ` Michal Hocko
2022-06-01 13:05                                         ` Michal Hocko
2022-06-01 14:22                                         ` Roman Gushchin
2022-06-01 14:22                                           ` Roman Gushchin
2022-06-01 15:24                                           ` Michal Hocko
2022-06-01 15:24                                             ` Michal Hocko
2022-06-01  9:26                                   ` Michal Hocko
2022-06-13  5:34                       ` [PATCH mm v4 " Vasily Averin
2022-06-13  5:34                         ` Vasily Averin
2022-06-23 14:50                         ` [PATCH mm v5 0/9] memcg: accounting for objects allocated by mkdir, cgroup Vasily Averin
2022-06-23 14:50                           ` Vasily Averin
2022-06-23 15:03                           ` Vasily Averin
2022-06-23 15:03                             ` Vasily Averin
2022-06-23 16:07                             ` Michal Hocko
2022-06-23 16:07                               ` Michal Hocko
2022-06-23 16:55                               ` Shakeel Butt
2022-06-23 16:55                                 ` Shakeel Butt
2022-06-24 10:40                                 ` Vasily Averin
2022-06-24 10:40                                   ` Vasily Averin
2022-06-24 12:26                                   ` Michal Koutný
2022-06-24 12:26                                     ` Michal Koutný
2022-06-24 13:59                                 ` Michal Hocko
2022-06-24 13:59                                   ` Michal Hocko
2022-06-25  9:43                                   ` [PATCH RFC] memcg: avoid idr ids space depletion Vasily Averin
2022-06-25  9:43                                     ` Vasily Averin
2022-06-25 14:04                                   ` [PATCH RFC] memcg: notify about global mem_cgroup_id " Vasily Averin
2022-06-25 14:04                                     ` Vasily Averin
2022-06-26  1:56                                     ` Roman Gushchin
2022-06-26  1:56                                       ` Roman Gushchin
2022-06-26  7:11                                       ` Vasily Averin
2022-06-26  7:11                                         ` Vasily Averin
2022-06-27  2:12                                         ` [PATCH cgroup] cgroup: set the correct return code if hierarchy limits are reached Vasily Averin
2022-06-27  2:12                                           ` Vasily Averin
2022-06-27  3:33                                           ` Muchun Song
2022-06-27  3:33                                             ` Muchun Song
2022-06-27  9:07                                           ` Tejun Heo
2022-06-27  9:07                                             ` Tejun Heo
2022-06-28  0:44                                           ` Roman Gushchin
2022-06-28  0:44                                             ` Roman Gushchin
2022-06-28  3:59                                             ` Vasily Averin
2022-06-28  3:59                                               ` Vasily Averin
2022-06-28  9:16                                               ` Michal Koutný
2022-06-28  9:16                                                 ` Michal Koutný
2022-06-28  9:22                                                 ` Tejun Heo
2022-06-29  6:13                                                   ` Vasily Averin
2022-06-29  6:13                                                     ` Vasily Averin
2022-06-29 19:25                                                     ` Tejun Heo
2022-06-29 19:25                                                       ` Tejun Heo
2022-07-01  2:42                                                       ` Roman Gushchin
2022-07-01  2:42                                                         ` Roman Gushchin
2022-06-27  2:11                                       ` [PATCH mm v2] memcg: notify about global mem_cgroup_id space depletion Vasily Averin
2022-06-27  3:23                                         ` Muchun Song
2022-06-27  3:23                                           ` Muchun Song
2022-06-27  6:49                                           ` Vasily Averin
2022-06-27  6:49                                             ` Vasily Averin
2022-06-28  1:11                                             ` Roman Gushchin
2022-06-28  1:11                                               ` Roman Gushchin
2022-06-28  3:43                                               ` Vasily Averin
2022-06-28  3:43                                                 ` Vasily Averin
2022-06-28  9:08                                               ` Michal Koutný
2022-06-28  9:08                                                 ` Michal Koutný
2022-06-27 16:37                                   ` [PATCH mm v5 0/9] memcg: accounting for objects allocated by mkdir, cgroup Shakeel Butt
2022-06-27 16:37                                     ` Shakeel Butt
2022-07-01 11:03                                     ` Michal Hocko
2022-07-10 18:53                                       ` Vasily Averin
2022-07-10 18:53                                         ` Vasily Averin
2022-07-11 16:24                                         ` Michal Hocko
2022-07-11 16:24                                           ` Michal Hocko
2022-06-23 14:50                         ` [PATCH mm v5 1/9] memcg: enable accounting for struct cgroup Vasily Averin
2022-06-23 14:50                           ` Vasily Averin
2022-06-23 14:50                         ` [PATCH mm v5 2/9] memcg: enable accounting for kernfs nodes Vasily Averin
2022-06-23 14:50                           ` Vasily Averin
2022-06-23 14:51                         ` [PATCH mm v5 3/9] memcg: enable accounting for kernfs iattrs Vasily Averin
2022-06-23 14:51                           ` Vasily Averin
2022-06-23 14:51                         ` [PATCH mm v5 4/9] memcg: enable accounting for struct simple_xattr Vasily Averin
2022-06-23 14:51                           ` Vasily Averin
2022-06-23 14:51                         ` [PATCH mm v5 5/9] memcg: enable accounting for percpu allocation of struct psi_group_cpu Vasily Averin
2022-06-23 14:51                           ` Vasily Averin
2022-06-23 14:51                         ` [PATCH mm v5 6/9] memcg: enable accounting for percpu allocation of struct cgroup_rstat_cpu Vasily Averin
2022-06-23 14:51                           ` Vasily Averin
2022-06-23 14:51                         ` [PATCH mm v5 7/9] memcg: enable accounting for large allocations in mem_cgroup_css_alloc Vasily Averin
2022-06-23 14:51                           ` Vasily Averin
2022-06-23 14:51                         ` [PATCH mm v5 8/9] memcg: enable accounting for allocations in alloc_fair_sched_group Vasily Averin
2022-06-23 14:51                           ` Vasily Averin
2022-06-23 14:52                         ` [PATCH mm v5 9/9] memcg: enable accounting for perpu allocation of struct rt_rq Vasily Averin
2022-06-23 14:52                           ` Vasily Averin
2022-06-13  5:34                       ` [PATCH mm v4 1/9] memcg: enable accounting for struct cgroup Vasily Averin
2022-06-13  5:34                         ` Vasily Averin
2022-06-13  5:34                       ` [PATCH mm v4 2/9] memcg: enable accounting for kernfs nodes Vasily Averin
2022-06-13  5:34                         ` Vasily Averin
2022-06-13  5:34                       ` [PATCH mm v4 3/9] memcg: enable accounting for kernfs iattrs Vasily Averin
2022-06-13  5:34                         ` Vasily Averin
2022-06-13  5:35                       ` [PATCH mm v4 4/9] memcg: enable accounting for struct simple_xattr Vasily Averin
2022-06-13  5:35                         ` Vasily Averin
2022-06-13  5:35                       ` [PATCH mm v4 5/9] memcg: enable accounting for percpu allocation of struct psi_group_cpu Vasily Averin
2022-06-13  5:35                         ` Vasily Averin
2022-06-13  5:35                       ` [PATCH mm v4 6/9] memcg: enable accounting for percpu allocation of struct cgroup_rstat_cpu Vasily Averin
2022-06-13  5:35                         ` Vasily Averin
2022-06-13  5:35                       ` [PATCH mm v4 7/9] memcg: enable accounting for large allocations in mem_cgroup_css_alloc Vasily Averin
2022-06-13  5:35                         ` Vasily Averin
2022-06-13  5:35                       ` [PATCH mm v4 8/9] memcg: enable accounting for allocations in alloc_fair_sched_group Vasily Averin
2022-06-13  5:35                         ` Vasily Averin
2022-06-13  5:35                       ` [PATCH mm v4 9/9] memcg: enable accounting for perpu allocation of struct rt_rq Vasily Averin
     [not found]                     ` <cover.1653899364.git.vvs@openvz.org>
2022-05-30 11:25                       ` [PATCH mm v3 1/9] memcg: enable accounting for struct cgroup Vasily Averin
2022-05-30 11:25                         ` Vasily Averin
2022-05-30 11:26                       ` [PATCH mm v3 2/9] memcg: enable accounting for kernfs nodes Vasily Averin
2022-05-30 11:26                         ` Vasily Averin
2022-05-30 11:26                       ` [PATCH mm v3 3/9] memcg: enable accounting for kernfs iattrs Vasily Averin
2022-05-30 11:26                         ` Vasily Averin
2022-05-30 11:26                       ` [PATCH mm v3 4/9] memcg: enable accounting for struct simple_xattr Vasily Averin
2022-05-30 11:26                         ` Vasily Averin
2022-05-30 11:26                       ` [PATCH mm v3 5/9] memcg: enable accounting for percpu allocation of struct psi_group_cpu Vasily Averin
2022-05-30 11:26                       ` [PATCH mm v3 6/9] memcg: enable accounting for percpu allocation of struct cgroup_rstat_cpu Vasily Averin
2022-05-30 15:04                         ` Muchun Song
2022-05-30 15:04                           ` Muchun Song
2022-05-30 11:26                       ` [PATCH mm v3 7/9] memcg: enable accounting for large allocations in mem_cgroup_css_alloc Vasily Averin
2022-05-30 11:26                         ` Vasily Averin
2022-05-30 11:26                       ` [PATCH mm v3 8/9] memcg: enable accounting for allocations in alloc_fair_sched_group Vasily Averin
2022-05-30 11:26                         ` Vasily Averin
2022-05-30 11:27                       ` [PATCH mm v3 9/9] memcg: enable accounting for perpu allocation of struct rt_rq Vasily Averin
2022-05-30 11:27                         ` Vasily Averin
2022-05-30 15:06                         ` Muchun Song
2022-05-21 16:37                   ` [PATCH mm v2 1/9] memcg: enable accounting for struct cgroup Vasily Averin
2022-05-21 16:37                     ` Vasily Averin
2022-05-22  6:37                     ` Muchun Song
2022-05-22  6:37                       ` Muchun Song
2022-05-21 16:37                   ` [PATCH mm v2 2/9] memcg: enable accounting for kernfs nodes Vasily Averin
2022-05-21 16:37                     ` Vasily Averin
2022-05-22  6:37                     ` Muchun Song
2022-05-22  6:37                       ` Muchun Song
2022-05-21 16:37                   ` [PATCH mm v2 3/9] memcg: enable accounting for kernfs iattrs Vasily Averin
2022-05-21 16:37                     ` Vasily Averin
2022-05-22  6:38                     ` Muchun Song
2022-05-22  6:38                       ` Muchun Song
2022-05-21 16:38                   ` [PATCH mm v2 4/9] memcg: enable accounting for struct simple_xattr Vasily Averin
2022-05-21 16:38                     ` Vasily Averin
2022-05-22  6:38                     ` Muchun Song
2022-05-22  6:38                       ` Muchun Song
2022-05-21 16:38                   ` [PATCH mm v2 5/9] memcg: enable accounting for percpu allocation of struct psi_group_cpu Vasily Averin
2022-05-21 16:38                     ` Vasily Averin
2022-05-21 21:34                     ` Shakeel Butt
2022-05-21 21:34                       ` Shakeel Butt
2022-05-22  6:40                     ` Muchun Song
2022-05-22  6:40                       ` Muchun Song
2022-05-25  1:30                     ` Roman Gushchin
2022-05-25  1:30                       ` Roman Gushchin
2022-05-21 16:38                   ` [PATCH mm v2 6/9] memcg: enable accounting for percpu allocation of struct cgroup_rstat_cpu Vasily Averin
2022-05-21 16:38                     ` Vasily Averin
2022-05-21 17:58                     ` Vasily Averin
2022-05-21 17:58                       ` Vasily Averin
2022-05-21 21:35                     ` Shakeel Butt
2022-05-21 21:35                       ` Shakeel Butt
2022-05-21 22:05                     ` kernel test robot
2022-05-21 22:05                       ` kernel test robot
2022-05-25  1:31                     ` Roman Gushchin
2022-05-25  1:31                       ` Roman Gushchin
2022-05-21 16:38                   ` [PATCH mm v2 7/9] memcg: enable accounting for large allocations in mem_cgroup_css_alloc Vasily Averin
2022-05-21 16:38                     ` Vasily Averin
2022-05-22  6:47                     ` Muchun Song
2022-05-22  6:47                       ` Muchun Song
2022-05-21 16:38                   ` [PATCH mm v2 8/9] memcg: enable accounting for allocations in alloc_fair_sched_group Vasily Averin
2022-05-21 16:38                     ` Vasily Averin
2022-05-22  6:49                     ` Muchun Song
2022-05-21 16:39                   ` [PATCH mm v2 9/9] memcg: enable accounting for percpu allocation of struct rt_rq Vasily Averin
2022-05-21 16:39                     ` Vasily Averin
2022-05-21 21:37                     ` Shakeel Butt
2022-05-21 21:37                       ` Shakeel Butt
2022-05-25  1:31                     ` Roman Gushchin
2022-05-25  1:31                       ` Roman Gushchin
2022-05-13 15:51               ` [PATCH 1/4] memcg: enable accounting for large allocations in mem_cgroup_css_alloc Vasily Averin
2022-05-13 15:51                 ` Vasily Averin
2022-05-19 16:46                 ` Michal Koutný
2022-05-19 16:46                   ` Michal Koutný
2022-05-20  1:07                 ` Shakeel Butt
2022-05-20  1:07                   ` Shakeel Butt
2022-05-13 15:51               ` [PATCH 2/4] memcg: enable accounting for kernfs nodes and iattrs Vasily Averin
2022-05-13 15:51                 ` Vasily Averin
2022-05-19 16:33                 ` Michal Koutný
2022-05-19 16:33                   ` Michal Koutný
2022-05-20  1:12                 ` Shakeel Butt
2022-05-20  1:12                   ` Shakeel Butt
2022-05-13 15:52               ` [PATCH 3/4] memcg: enable accounting for struct cgroup Vasily Averin
2022-05-13 15:52                 ` Vasily Averin
2022-05-19 16:53                 ` Michal Koutný
2022-05-19 16:53                   ` Michal Koutný
2022-05-20  7:24                   ` Vasily Averin
2022-05-20  7:24                     ` Vasily Averin
2022-05-20 20:16                     ` Vasily Averin
2022-05-20 20:16                       ` Vasily Averin
2022-05-21  0:55                       ` Roman Gushchin
2022-05-21  0:55                         ` Roman Gushchin
2022-05-21  7:28                         ` Vasily Averin
2022-05-21  7:28                           ` Vasily Averin
2022-05-23 13:52                       ` Michal Koutný
2022-05-23 13:52                         ` Michal Koutný
2022-05-20  1:31                 ` Shakeel Butt
2022-05-13 15:52               ` [PATCH 4/4] memcg: enable accounting for allocations in alloc_fair_sched_group Vasily Averin
2022-05-13 15:52                 ` Vasily Averin
2022-05-19 16:45                 ` Michal Koutný
2022-05-19 16:45                   ` Michal Koutný
2022-05-20  1:18                 ` Shakeel Butt
2022-05-20  1:18                   ` Shakeel Butt

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