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    Subject[PATCH v7 0/4] 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 (4):
    mm: introduce compaction and migration for virtio ballooned pages
    virtio_balloon: introduce migration primitives to balloon pages
    mm: introduce putback_movable_pages()
    mm: add vm event counters for balloon pages compaction

    drivers/virtio/virtio_balloon.c | 139 +++++++++++++++++++++++++++++++++++++---
    include/linux/migrate.h | 2 +
    include/linux/mm.h | 17 +++++
    include/linux/virtio_balloon.h | 4 ++
    include/linux/vm_event_item.h | 8 ++-
    mm/compaction.c | 131 +++++++++++++++++++++++++++++++------
    mm/migrate.c | 51 ++++++++++++++-
    mm/page_alloc.c | 2 +-
    mm/vmstat.c | 10 ++-
    9 files changed, 331 insertions(+), 33 deletions(-)

    Change log:
    v7:
    * fix a potential page leak case at 'putback_balloon_page' (Mel);
    * adjust vm-events-counter patch and remove its drop-on-merge message (Rik);
    * add 'putback_movable_pages' to avoid hacks on 'putback_lru_pages' (Minchan);
    v6:
    * rename 'is_balloon_page()' to 'movable_balloon_page()' (Rik);
    v5:
    * address Andrew Morton's review comments on the patch series;
    * address a couple extra nitpick suggestions on PATCH 01 (Minchan);
    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 2048mB RAM KVM guest running 3.6.0_rc1+ -- 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_isolated 0
    compact_balloon_migrated 0
    compact_balloon_returned 0
    compact_balloon_released 0
    [root@localhost ~]#
    [root@localhost ~]# for i in $(seq 1 6); 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
    [5]- Done echo 1 > /proc/sys/vm/compact_memory
    [6]+ Done echo 1 > /proc/sys/vm/compact_memory
    [root@localhost ~]#
    [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat
    compact_blocks_moved 6579
    compact_pages_moved 50114
    compact_pagemigrate_failed 111
    compact_stall 0
    compact_fail 0
    compact_success 0
    compact_balloon_isolated 18361
    compact_balloon_migrated 18306
    compact_balloon_returned 55
    compact_balloon_released 18306


    * 128 mB 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_isolated 0
    compact_balloon_migrated 0
    compact_balloon_returned 0
    compact_balloon_released 0
    [root@localhost ~]#
    [root@localhost ~]# for i in $(seq 1 6); 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
    [5]- Done echo 1 > /proc/sys/vm/compact_memory
    [6]+ Done echo 1 > /proc/sys/vm/compact_memory
    [root@localhost ~]#
    [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat
    compact_blocks_moved 6789
    compact_pages_moved 64479
    compact_pagemigrate_failed 127
    compact_stall 0
    compact_fail 0
    compact_success 0
    compact_balloon_isolated 33937
    compact_balloon_migrated 33869
    compact_balloon_returned 68
    compact_balloon_released 33869

    --
    1.7.11.2



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