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    Subject[patch 0/8] mm: memcg naturalization -rc2
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    Hi,

    this is the second version of the memcg naturalization series. The
    notable changes since the first submission are:

    o the hierarchy walk is now intermittent and will abort and
    remember the last scanned child after sc->nr_to_reclaim pages
    have been reclaimed during the walk in one zone (Rik)

    o the global lru lists are never scanned when memcg is enabled
    after #2 'memcg-aware global reclaim', which makes this patch
    self-sufficient and complete without requiring the per-memcg lru
    lists to be exclusive (Michal)

    o renamed sc->memcg and sc->current_memcg to sc->target_mem_cgroup
    and sc->mem_cgroup and fixed their documentation, I hope this is
    better understandable now (Rik)

    o the reclaim statistic counters have been renamed. there is no
    more distinction between 'pgfree' and 'pgsteal', it is now
    'pgreclaim' in both cases; 'kswapd' has been replaced by
    'background'

    o fixed a nasty crash in the hierarchical soft limit check that
    happened during global reclaim in memcgs that are hierarchical
    but have no hierarchical parents themselves

    o properly implemented the memcg-aware unevictable page rescue
    scanner, there were several blatant bugs in there

    o documentation on new public interfaces

    Thanks for your input on the first version.

    I ran microbenchmarks (sparse file catting, essentially) to stress
    reclaim and LRU operations. There is no measurable overhead for
    !CONFIG_MEMCG, memcg disabled during boot, memcg enabled but no
    configured groups, and hard limit reclaim.

    I also ran single-threaded kernbenchs in four unlimited memcgs in
    parallel, contained in a hard-limited hierarchical parent that put
    constant pressure on the workload. There is no measurable difference
    in runtime, the pgpgin/pgpgout counters, and fairness among memcgs in
    this test compared to an unpatched kernel. Needs more evaluation,
    especially with a higher number of memcgs.

    The soft limit changes are also proven to work in so far that it is
    possible to prioritize between children in a hierarchy under pressure
    and that runtime differences corresponded directly to the soft limit
    settings in the previously described kernbench setup with staggered
    soft limits on the groups, but this needs quantification.

    Based on v2.6.39.

    include/linux/memcontrol.h | 91 +++--
    include/linux/mm_inline.h | 14 +-
    include/linux/mmzone.h | 10 +-
    include/linux/page_cgroup.h | 36 --
    include/linux/swap.h | 4 -
    mm/memcontrol.c | 889 ++++++++++++++-----------------------------
    mm/page_alloc.c | 2 +-
    mm/page_cgroup.c | 38 +--
    mm/swap.c | 20 +-
    mm/vmscan.c | 296 ++++++++-------
    10 files changed, 536 insertions(+), 864 deletions(-)



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