linux-kernel - Re: [PATCH mm v2 5/9] memcg: enable accounting for percpu allocation of struct psi_group

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Message-ID: <Yona8fgW1bdhq2wL@FVFYT0MHHV2J.usts.net>
Date:   Sun, 22 May 2022 14:40:49 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, kernel@...nvz.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Koutný <mkoutny@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH mm v2 5/9] memcg: enable accounting for percpu allocation
 of struct psi_group_cpu

On Sat, May 21, 2022 at 07:38:21PM +0300, Vasily Averin wrote:
> struct pci_group_cpu is percpu allocated for each new cgroup and can
> consume a significant portion of all allocated memory on nodes with
> a large number of CPUs.
> 
> Common part of the cgroup creation:
> Allocs  Alloc   $1*$2   Sum     Allocation
> number  size
> --------------------------------------------
> 16  ~   352     5632    5632    KERNFS
> 1   +   4096    4096    9728    (cgroup_mkdir+0xe4)
> 1       584     584     10312   (radix_tree_node_alloc.constprop.0+0x89)
> 1       192     192     10504   (__d_alloc+0x29)
> 2       72      144     10648   (avc_alloc_node+0x27)
> 2       64      128     10776   (percpu_ref_init+0x6a)
> 1       64      64      10840   (memcg_list_lru_alloc+0x21a)
> percpu:
> 1   +   192     192     192     call_site=psi_cgroup_alloc+0x1e
> 1   +   96      96      288     call_site=cgroup_rstat_init+0x5f
> 2       12      24      312     call_site=percpu_ref_init+0x23
> 1       6       6       318     call_site=__percpu_counter_init+0x22
> 
>  '+' -- to be accounted,
>  '~' -- partially accounted
> 
> Signed-off-by: Vasily Averin <vvs@...nvz.org>

Reviewed-by: Muchun Song <songmuchun@...edance.com>