linux-kernel - Re: [PATCH 5/8] mm: memcontrol: account socket memory on unified hierarchy

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Message-ID: <20151106174517.GA9315@cmpxchg.org>
Date:	Fri, 6 Nov 2015 12:45:17 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	vdavydov@...tuozzo.com, tj@...nel.org, netdev@...r.kernel.org,
	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] mm: memcontrol: account socket memory on unified
 hierarchy

On Fri, Nov 06, 2015 at 05:46:57PM +0100, Michal Hocko wrote:
> The basic problem was that the Delegate feature has been backported to
> our systemd package without further consideration and that has
> invalidated a lot of performance testing because some resource
> controllers have measurable effects on those benchmarks.

You're talking about a userspace bug. No amount of fragmenting and
layering and opt-in in the kernel's runtime configuration space is
going to help you if you screw up and enable it all by accident.

> > All I read here is vague inflammatory language to spread FUD.
> 
> I was merely pointing out that memory controller might be enabled without
> _user_ actually even noticing because the controller wasn't enabled
> explicitly. I haven't blamed anybody for that.

Why does that have anything to do with how we design our interface?

We can't do more than present a sane interface in good faith and lobby
userspace projects if we think they misuse it.
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