From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexey Dobriyan <adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] IPC: account for kmem usage on mqueue and msg
Date: Tue, 18 Oct 2016 22:30:21 +0300
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To: Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Aristeu Rozanski <arozansk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Davidlohr Bueso <dave-h16yJtLeMjHk1uMJSBkQmQ@public.gmane.org>, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Vladimir Davydov <vdavydov.dev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Stefan Schimanski <sttts-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Tue, Oct 18, 2016 at 08:26:19PM +0200, Michal Hocko wrote:
> On Tue 18-10-16 11:54:35, Aristeu Rozanski wrote:
> > When kmem accounting switched from account by default to only account if
> > flagged by __GFP_ACCOUNT, IPC mqueue and messages was left out.
> 
> I guess this was because ipv msgqueue shouldn't allow for memory
> consumption runaways. The number of message queues and messages pending
> in them is bounded and not a large amount of memory AFAIR. Anyway I do
> not see anything unreasonable about accounting the memory to the caller.

It should be accounted because receiver may not intentionally or unintentionally
consume messages.