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    Subject[PATCH 0/4] Memory controller soft limit patches (v3)

    From: Balbir Singh <balbir@linux.vnet.ibm.com>

    Changelog v3...v2
    1. Implemented several review comments from Kosaki-San and Kamezawa-San
    Please see individual changelogs for changes

    Changelog v2...v1
    1. Soft limits now support hierarchies
    2. Use spinlocks instead of mutexes for synchronization of the RB tree

    Here is v3 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. The CPU controllers interpretation
    of shares is very different though.

    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.

    If there are no major objections to the patches, I would like to get them
    included in -mm.

    TODOs

    1. The current implementation maintains the delta from the soft limit
    and pushes back groups to their soft limits, a ratio of delta/soft_limit
    might be more useful
    2. It would be nice to have more targetted reclaim (in terms of pages to
    recalim) interface. So that groups are pushed back, close to their soft
    limits.

    Tests
    -----

    I've run two memory intensive workloads with differing soft limits and
    seen that they are pushed back to their soft limit on contention. Their usage
    was their soft limit plus additional memory that they were able to grab
    on the system. Soft limit can take a while before we see the expected
    results.

    Please review, comment.

    Series
    ------

    memcg-soft-limit-documentation.patch
    memcg-add-soft-limit-interface.patch
    memcg-organize-over-soft-limit-groups.patch
    memcg-soft-limit-reclaim-on-contention.patch



    --
    Balbir


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