[Devel] Re: [PATCH v3 04/13] kmem accounting basic infrastructure

[Glauber Costa]

On 09/30/2012 02:37 PM, Tejun Heo wrote:
> Hello, James.
> 
> On Sun, Sep 30, 2012 at 09:56:28AM +0100, James Bottomley wrote:
>> The beancounter approach originally used by OpenVZ does exactly this.
>> There are two specific problems, though, firstly you can't count
>> references in generic code, so now you have to extend the cgroup
>> tentacles into every object, an invasiveness which people didn't really
>> like.
> 
> Yeah, it will need some hooks.  For dentry and inode, I think it would
> be pretty well isolated tho.  Wasn't it?
> 

We would still need something for the stack. For open files, and for
everything that becomes a potential problem. We then end up with 35
different knobs instead of one. One of the perceived advantages of this
approach, is that it condenses as much data as a single knob as
possible, reducing complexity and over flexibility.