linux-kernel - Re: [PATCH] Document huge memory/cache overhead of memory controller in Kconfig

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Date:	Wed, 20 Feb 2008 16:49:04 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	John Stoffel <john@...ffel.org>, Andi Kleen <andi@...stfloor.org>,
	akpm@...l.org, torvalds@...l.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] Document huge memory/cache overhead of memory controller
 in Kconfig


On Feb 20 2008 20:50, Balbir Singh wrote:
>John Stoffel wrote:
>> I know this is a pedantic comment, but why the heck is it called such
>> a generic term as "Memory Controller" which doesn't give any
>> indication of what it does.
>> 
>> Shouldn't it be something like "Memory Quota Controller", or "Memory
>> Limits Controller"?
>
>It's called the memory controller since it controls the amount of
>memory that a user can allocate (via limits). The generic term for
>any resource manager plugged into cgroups is a controller.

For ordinary desktop people, memory controller is what developers
know as MMU or sometimes even some other mysterious piece of silicon
inside the heavy box.

>If you look through some of the references in the document, we've
>listed our plans to support other categories of memory as well.
>Hence it's called a memory controller
>
>> Also, the Kconfig name "CGROUP_MEM_CONT" is just wrong, it should
>> be "CGROUP_MEM_CONTROLLER", just spell it out so it's clear what's
>> up.
>
>This has some history as well. Control groups was called containers
>earlier. That way a name like CGROUP_MEM_CONT could stand for cgroup
>memory container or cgroup memory controller.

CONT is shorthand for "continue" ;-) (SIGCONT, f.ex.), ctrl or ctrlr
it is for controllers (comes from Solaris iirc.)

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