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    SubjectRe: [RFC][PATCH 0/4] Memory controller soft limit patches
    On Thu, 8 Jan 2009 00:26:27 +0530
    Dhaval Giani <dhaval@linux.vnet.ibm.com> wrote:

    > 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?
    >
    I don't like to add "share" as the kernel interface of memcg.
    We used "bytes" to do (hard) limit. Please just use "bytes".

    Thanks,
    -Kame



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