linux-kernel - Re: [patch 2/2] mm: memcontrol: default hierarchy interface for memory

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Message-ID: <xr93a91mz2s7.fsf@gthelen.mtv.corp.google.com>
Date:	Tue, 13 Jan 2015 15:20:08 -0800
From:	Greg Thelen <gthelen@...gle.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] mm: memcontrol: default hierarchy interface for memory


On Thu, Jan 08 2015, Johannes Weiner wrote:

> Introduce the basic control files to account, partition, and limit
> memory using cgroups in default hierarchy mode.
>
> This interface versioning allows us to address fundamental design
> issues in the existing memory cgroup interface, further explained
> below.  The old interface will be maintained indefinitely, but a
> clearer model and improved workload performance should encourage
> existing users to switch over to the new one eventually.
>
> The control files are thus:
>
>   - memory.current shows the current consumption of the cgroup and its
>     descendants, in bytes.
>
>   - memory.low configures the lower end of the cgroup's expected
>     memory consumption range.  The kernel considers memory below that
>     boundary to be a reserve - the minimum that the workload needs in
>     order to make forward progress - and generally avoids reclaiming
>     it, unless there is an imminent risk of entering an OOM situation.

So this is try-hard, but no-promises interface.  No complaints.  But I
assume that an eventual extension is a more rigid memory.min which
specifies a minimum working set under which an container would prefer an
oom kill to thrashing.
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