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 <[email protected]>
Reviewed-by: Muchun Song <[email protected]>