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    SubjectRe: [PATCH v3 00/21] mm: lru_lock splitting
    On Thu, 23 Feb 2012 17:51:36 +0400
    Konstantin Khlebnikov <khlebnikov@openvz.org> wrote:

    > v3 changes:
    > * inactive-ratio reworked again, now it always calculated from from scratch
    > * hierarchical pte reference bits filter in memory-cgroup reclaimer
    > * fixed two bugs in locking, found by Hugh Dickins
    > * locking functions slightly simplified
    > * new patch for isolated pages accounting
    > * new patch with lru interleaving
    >
    > This patchset is based on next-20120210
    >
    > git: https://github.com/koct9i/linux/commits/lruvec-v3
    >

    I wonder.... I just wonder...if we can split a lruvec in a zone into small
    pieces of lruvec and have splitted LRU-lock per them, do we need per-memcg-lrulock ?

    It seems per-memcg-lrulock can be much bigger lock than small-lruvec-lock.
    (depends on configuraton) and much more complicated..and have to take care
    of many things.. If unit of splitting can be specified by boot option,
    it seems admins can split a big memcg's per-memcg-lru lock into more small pieces.

    BTW, how to think of default size of splitting ? I wonder splitting lru into
    the number of cpus per a node can be a choice. Each cpu may have a chance to
    set prefered-pfn-range at page allocation with additional patches.

    Thanks,
    -Kame


    > ---
    >
    > Konstantin Khlebnikov (21):
    > memcg: unify inactive_ratio calculation
    > memcg: make mm_match_cgroup() hirarchical
    > memcg: fix page_referencies cgroup filter on global reclaim
    > memcg: use vm_swappiness from target memory cgroup
    > mm: rename lruvec->lists into lruvec->pages_lru
    > mm: lruvec linking functions
    > mm: add lruvec->pages_count
    > mm: unify inactive_list_is_low()
    > mm: add lruvec->reclaim_stat
    > mm: kill struct mem_cgroup_zone
    > mm: move page-to-lruvec translation upper
    > mm: push lruvec into update_page_reclaim_stat()
    > mm: push lruvecs from pagevec_lru_move_fn() to iterator
    > mm: introduce lruvec locking primitives
    > mm: handle lruvec relocks on lumpy reclaim
    > mm: handle lruvec relocks in compaction
    > mm: handle lruvec relock in memory controller
    > mm: add to lruvec isolated pages counters
    > memcg: check lru vectors emptiness in pre-destroy
    > mm: split zone->lru_lock
    > mm: zone lru vectors interleaving
    >
    >
    > include/linux/huge_mm.h | 3
    > include/linux/memcontrol.h | 75 ------
    > include/linux/mm.h | 66 +++++
    > include/linux/mm_inline.h | 19 +-
    > include/linux/mmzone.h | 39 ++-
    > include/linux/swap.h | 6
    > mm/Kconfig | 16 +
    > mm/compaction.c | 31 +--
    > mm/huge_memory.c | 14 +
    > mm/internal.h | 204 +++++++++++++++++
    > mm/ksm.c | 2
    > mm/memcontrol.c | 343 +++++++++++-----------------
    > mm/migrate.c | 2
    > mm/page_alloc.c | 70 +-----
    > mm/rmap.c | 2
    > mm/swap.c | 217 ++++++++++--------
    > mm/vmscan.c | 534 ++++++++++++++++++++++++--------------------
    > mm/vmstat.c | 6
    > 18 files changed, 932 insertions(+), 717 deletions(-)
    >
    > --
    > Signature
    >



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