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    Subject[PATCH v4 0/3] make balloon pages movable by compaction
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    Memory fragmentation introduced by ballooning might reduce significantly
    the number of 2MB contiguous memory blocks that can be used within a guest,
    thus imposing performance penalties associated with the reduced number of
    transparent huge pages that could be used by the guest workload.

    This patch-set follows the main idea discussed at 2012 LSFMMS session:
    "Ballooning for transparent huge pages" -- http://lwn.net/Articles/490114/
    to introduce the required changes to the virtio_balloon driver, as well as
    the changes to the core compaction & migration bits, in order to make those
    subsystems aware of ballooned pages and allow memory balloon pages become
    movable within a guest, thus avoiding the aforementioned fragmentation issue

    Rafael Aquini (3):
    mm: introduce compaction and migration for virtio ballooned pages
    virtio_balloon: introduce migration primitives to balloon pages
    mm: add vm event counters for balloon pages compaction

    drivers/virtio/virtio_balloon.c | 146 ++++++++++++++++++++++++++++++++++++---
    include/linux/mm.h | 15 ++++
    include/linux/virtio_balloon.h | 4 ++
    include/linux/vm_event_item.h | 2 +
    mm/compaction.c | 127 +++++++++++++++++++++++++++++-----
    mm/migrate.c | 32 ++++++++-
    mm/vmstat.c | 4 ++
    7 files changed, 302 insertions(+), 28 deletions(-)

    Change log:
    v4:
    * address Rusty Russel's review comments on PATCH 02;
    * re-base virtio_balloon patch on 9c378abc5c0c6fc8e3acf5968924d274503819b3;
    V3:
    * address reviewers nitpick suggestions on PATCH 01 (Mel, Minchan);
    V2:
    * address Mel Gorman's review comments on PATCH 01;


    Preliminary test results:
    (2 VCPU 1024mB RAM KVM guest running 3.5.0_rc7+ -- after a reboot)
    * 64mB balloon:
    [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat
    compact_blocks_moved 0
    compact_pages_moved 0
    compact_pagemigrate_failed 0
    compact_stall 0
    compact_fail 0
    compact_success 0
    compact_balloon_migrated 0
    compact_balloon_failed 0
    compact_balloon_isolated 0
    compact_balloon_freed 0
    [root@localhost ~]#
    [root@localhost ~]# for i in $(seq 1 4); do echo 1 > /proc/sys/vm/compact_memory & done &>/dev/null
    [1] Done echo 1 > /proc/sys/vm/compact_memory
    [2] Done echo 1 > /proc/sys/vm/compact_memory
    [3]- Done echo 1 > /proc/sys/vm/compact_memory
    [4]+ Done echo 1 > /proc/sys/vm/compact_memory
    [root@localhost ~]#
    [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat
    compact_blocks_moved 2842
    compact_pages_moved 48429
    compact_pagemigrate_failed 81
    compact_stall 0
    compact_fail 0
    compact_success 0
    compact_balloon_migrated 16364
    compact_balloon_failed 0
    compact_balloon_isolated 16364
    compact_balloon_freed 16364


    * 128mB balloon:
    [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat
    compact_blocks_moved 0
    compact_pages_moved 0
    compact_pagemigrate_failed 0
    compact_stall 0
    compact_fail 0
    compact_success 0
    compact_balloon_migrated 0
    compact_balloon_failed 0
    compact_balloon_isolated 0
    compact_balloon_freed 0
    [root@localhost ~]#
    [root@localhost ~]# for i in $(seq 1 4); do echo 1 > /proc/sys/vm/compact_memory & done &>/dev/null
    [1] Done echo 1 > /proc/sys/vm/compact_memory
    [2] Done echo 1 > /proc/sys/vm/compact_memory
    [3]- Done echo 1 > /proc/sys/vm/compact_memory
    [4]+ Done echo 1 > /proc/sys/vm/compact_memory
    [root@localhost ~]#
    [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat
    compact_blocks_moved 2162
    compact_pages_moved 33735
    compact_pagemigrate_failed 69
    compact_stall 0
    compact_fail 0
    compact_success 0
    compact_balloon_migrated 21731
    compact_balloon_failed 0
    compact_balloon_isolated 21731
    compact_balloon_freed 21731

    --
    1.7.10.4



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