Re: [RFC][PATCH 0/4] Memory controller soft limit patches

[Dhaval Giani <dhaval@linux.vnet.ibm.com>]

On Thu, Jan 08, 2009 at 12:11:10AM +0530, Balbir Singh wrote:
> 
> Here is v1 of the new soft limit implementation. Soft limits is a new feature
> for the memory resource controller, something similar has existed in the
> group scheduler in the form of shares. We'll compare shares and soft limits
> below. I've had soft limit implementations earlier, but I've discarded those
> approaches in favour of this one.
> 
> Soft limits are the most useful feature to have for environments where
> the administrator wants to overcommit the system, such that only on memory
> contention do the limits become active. The current soft limits implementation
> provides a soft_limit_in_bytes interface for the memory controller and not
> for memory+swap controller. The implementation maintains an RB-Tree of groups
> that exceed their soft limit and starts reclaiming from the group that
> exceeds this limit by the maximum amount.
> 
> This is an RFC implementation and is not meant for inclusion
> 
> TODOs
> 
> 1. The shares interface is not yet implemented, the current soft limit
>    implementation is not yet hierarchy aware. The end goal is to add
>    a shares interface on top of soft limits and to maintain shares in
>    a manner similar to the group scheduler

Just to clarify, when there is no contention, you want to share memory
proportionally?

thanks,
-- 
regards,
Dhaval