Re: memcg: slab control

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

Hi

> Hi,
> 
> I wanted to see what the current ideas are concerning kernel memory 
> accounting as it relates to the memory controller.  Eventually we'll want 
> the ability to restrict cgroups to a hard slab limit.  That'll require 
> accounting to map slab allocations back to user tasks so that we can 
> enforce a policy based on the cgroup's aggregated slab usage similiar to 
> how the memory controller currently does for user memory.
> 
> Is this currently being thought about within the memcg community?  We'd 
> like to start a discussion and get everybody's requirements and interests 
> on the table and then become actively involved in the development of such 
> a feature.

I don't think memory hard isolation is bad idea. however, slab restriction
is too strange. some device use slab frequently, another someone use get_free_pages()
directly. only slab restriction will not make expected result from admin view.

Probably, we need to implement generic memory reservation framework. it mihgt help
implemnt rt-task memory reservation and userland oom manager.

It is only my personal opinion...


Thanks.

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