From: Roman Gushchin <guro-b10kYP2dOMg@public.gmane.org>
To: Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Greg Thelen <gthelen-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"David S . Miller"
<davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
Alexey Kuznetsov <kuznet-v/Mj1YrvjDBInbfyfbPRSQ@public.gmane.org>,
Hideaki YOSHIFUJI
<yoshfuji-VfPWfsRibaP+Ru+s062T9g@public.gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v4 2/2] net: memcg: late association of sock to memcg
Date: Tue, 10 Mar 2020 15:38:48 -0700 [thread overview]
Message-ID: <20200310223848.GC96999@carbon.dhcp.thefacebook.com> (raw)
In-Reply-To: <20200310051606.33121-2-shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
On Mon, Mar 09, 2020 at 10:16:06PM -0700, Shakeel Butt wrote:
> If a TCP socket is allocated in IRQ context or cloned from unassociated
> (i.e. not associated to a memcg) in IRQ context then it will remain
> unassociated for its whole life. Almost half of the TCPs created on the
> system are created in IRQ context, so, memory used by such sockets will
> not be accounted by the memcg.
>
> This issue is more widespread in cgroup v1 where network memory
> accounting is opt-in but it can happen in cgroup v2 if the source socket
> for the cloning was created in root memcg.
>
> To fix the issue, just do the association of the sockets at the accept()
> time in the process context and then force charge the memory buffer
> already used and reserved by the socket.
>
> Signed-off-by: Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Roman Gushchin <guro-b10kYP2dOMg@public.gmane.org>
Thank you!
next prev parent reply other threads:[~2020-03-10 22:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-10 5:16 [PATCH v4 1/2] cgroup: memcg: net: do not associate sock with unrelated cgroup Shakeel Butt
[not found] ` <20200310051606.33121-1-shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-10 5:16 ` [PATCH v4 2/2] net: memcg: late association of sock to memcg Shakeel Butt
2020-03-10 22:34 ` David Miller
[not found] ` <20200310051606.33121-2-shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-10 15:53 ` Eric Dumazet
2020-03-10 22:38 ` Roman Gushchin [this message]
2020-03-12 14:03 ` Qian Cai
2020-03-12 14:05 ` Shakeel Butt
2020-03-10 22:34 ` [PATCH v4 1/2] cgroup: memcg: net: do not associate sock with unrelated cgroup David Miller
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