This patchset follows the main idea discussed at 2012 LSFMMS section: "Ballooning for transparent huge pages" -- http://lwn.net/Articles/490114/ to introduce the required changes to the virtio_balloon driver, as well as changes to the core compaction & migration bits, in order to allow memory balloon pages become movable within a guest. Rafael Aquini (4): mm: introduce compaction and migration for virtio ballooned pages virtio_balloon: handle concurrent accesses to virtio_balloon struct elements virtio_balloon: introduce migration primitives to balloon pages mm: add vm event counters for balloon pages compaction drivers/virtio/virtio_balloon.c | 142 +++++++++++++++++++++++++++++++++++---- include/linux/mm.h | 17 +++++ include/linux/virtio_balloon.h | 6 ++ include/linux/vm_event_item.h | 2 + mm/compaction.c | 74 ++++++++++++++++++++ mm/migrate.c | 32 ++++++++- mm/vmstat.c | 4 ++ 7 files changed, 263 insertions(+), 14 deletions(-) Preliminary test results: (2 VCPU 1024mB RAM KVM guest running 3.5.0_rc4+) * 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 > /proc/sys/vm/compact_memory [2] Done echo > /proc/sys/vm/compact_memory [3]- Done echo > /proc/sys/vm/compact_memory [4]+ Done echo > /proc/sys/vm/compact_memory [root@localhost ~]# [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat compact_blocks_moved 2683 compact_pages_moved 47502 compact_pagemigrate_failed 61 compact_stall 0 compact_fail 0 compact_success 0 compact_balloon_migrated 16384 compact_balloon_failed 0 compact_balloon_isolated 16384 compact_balloon_freed 16384 * 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 > /proc/sys/vm/compact_memory [2] Done echo > /proc/sys/vm/compact_memory [3]- Done echo > /proc/sys/vm/compact_memory [4]+ Done echo > /proc/sys/vm/compact_memory [root@localhost ~]# awk '/compact/ {print}' /proc/vmstat compact_blocks_moved 2624 compact_pages_moved 49195 compact_pagemigrate_failed 54 compact_stall 0 compact_fail 0 compact_success 0 compact_balloon_migrated 29350 compact_balloon_failed 29 compact_balloon_isolated 29379 compact_balloon_freed 29350 -- 1.7.10.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>