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    SubjectRe: [RFC][PATCH 0/9] memcg soft limit v2 (new design)
    * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-04-03 17:08:35]:

    > Hi,
    >
    > Memory cgroup's soft limit feature is a feature to tell global LRU
    > "please reclaim from this memcg at memory shortage".
    >
    > This is v2. Fixed some troubles under hierarchy. and increase soft limit
    > update hooks to proper places.
    >
    > This patch is on to
    > mmotom-Mar23 + memcg-cleanup-cache_charge.patch
    > + vmscan-fix-it-to-take-care-of-nodemask.patch
    >
    > So, not for wide use ;)
    >
    > This patch tries to avoid to use existing memcg's reclaim routine and
    > just tell "Hints" to global LRU. This patch is briefly tested and shows
    > good result to me. (But may not to you. plz brame me.)
    >
    > Major characteristic is.
    > - memcg will be inserted to softlimit-queue at charge() if usage excess
    > soft limit.
    > - softlimit-queue is a queue with priority. priority is detemined by size
    > of excessing usage.
    > - memcg's soft limit hooks is called by shrink_xxx_list() to show hints.
    > - Behavior is affected by vm.swappiness and LRU scan rate is determined by
    > global LRU's status.
    >
    > In this v2.
    > - problems under use_hierarchy=1 case are fixed.
    > - more hooks are added.
    > - codes are cleaned up.
    >

    The results seem good so far with some basic tests I've been doing.
    I'll come back with more feedback, I would like to see this feature in
    -mm soon.

    --
    Balbir


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