linux-kernel - Re: [PATCH nft] nft: memcg accounting for dynamically allocated objects

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Date:   Sat, 2 Apr 2022 01:01:58 +0200
From:   Florian Westphal <fw@...len.de>
To:     Roman Gushchin <roman.gushchin@...ux.dev>
Cc:     Florian Westphal <fw@...len.de>,
        Vasily Averin <vasily.averin@...ux.dev>,
        Pablo Neira Ayuso <pablo@...filter.org>, kernel@...nvz.org,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH nft] nft: memcg accounting for dynamically allocated
 objects

Roman Gushchin <roman.gushchin@...ux.dev> wrote:
> On Fri, Apr 01, 2022 at 09:31:59PM +0200, Florian Westphal wrote:
> > But what task/memcg is used for the accounting in that case?
> 
> Root memcg/no accounting, which is the same.
> 
> There is a way to account for a specific memcg in such cases, it's used for
> bpf maps, for example. We save a pointer to the memcg which created the map and
> charge it for all allocations from a !in_task context.

Great, so we could use same scheme later on if its required for some
use case.

>  so let's not do without regression tests and a serious need.

Sounds good. Thanks.