netdev - Re: [PATCH memcg v4] net: set proper memcg for net

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YmhueUucXP6RjMaR@carbon>
Date:   Tue, 26 Apr 2022 15:13:13 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Shakeel Butt <shakeelb@...gle.com>, kernel@...nvz.org,
        Florian Westphal <fw@...len.de>, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>, cgroups@...r.kernel.org,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH memcg v4] net: set proper memcg for net_init hooks
 allocations

On Tue, Apr 26, 2022 at 09:43:43AM +0300, Vasily Averin wrote:
> __register_pernet_operations() executes init hook of registered
> pernet_operation structure in all existing net namespaces.
> 
> Typically, these hooks are called by a process associated with
> the specified net namespace, and all __GFP_ACCOUNT marked
> allocation are accounted for corresponding container/memcg.
> 
> However __register_pernet_operations() calls the hooks in the same
> context, and as a result all marked allocations are accounted
> to one memcg for all processed net namespaces.
> 
> This patch adjusts active memcg for each net namespace and helps
> to account memory allocated inside ops_init() into the proper memcg.
> 
> Signed-off-by: Vasily Averin <vvs@...nvz.org>
> ---
> v4: get_mem_cgroup_from_kmem() renamed to get_mem_cgroup_from_obj(),
>     get_net_memcg() replaced by mem_cgroup_or_root(), suggested by Roman.
> 
> v3: put_net_memcg() replaced by an alreay existing mem_cgroup_put()
>     It checks memcg before accessing it, this is required for
>     __register_pernet_operations() called before memcg initialization.
>     Additionally fixed leading whitespaces in non-memcg_kmem version
>     of mem_cgroup_from_obj().
> 
> v2: introduced get/put_net_memcg(),
>     new functions are moved under CONFIG_MEMCG_KMEM
>     to fix compilation issues reported by Intel's kernel test robot
> 
> v1: introduced get_mem_cgroup_from_kmem(), which takes the refcount
>     for the found memcg, suggested by Shakeel
> ---
>  include/linux/memcontrol.h | 27 ++++++++++++++++++++++++++-
>  net/core/net_namespace.c   |  7 +++++++
>  2 files changed, 33 insertions(+), 1 deletion(-)

Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>

Thanks!