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Date: Sat, 25 Aug 2012 02:24:55 -0300
From: Rafael Aquini <aquini@...hat.com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
Rusty Russell <rusty@...tcorp.com.au>,
"Michael S. Tsirkin" <mst@...hat.com>,
Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
Andi Kleen <andi@...stfloor.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Minchan Kim <minchan@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Rafael Aquini <aquini@...hat.com>
Subject: [PATCH v9 0/5] make balloon pages movable by compaction
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 (5):
mm: introduce a common interface for balloon pages mobility
mm: introduce compaction and migration for 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 | 287 ++++++++++++++++++++++++++++++++++---
include/linux/balloon_compaction.h | 137 ++++++++++++++++++
include/linux/migrate.h | 2 +
include/linux/pagemap.h | 18 +++
include/linux/vm_event_item.h | 8 +-
mm/Kconfig | 15 ++
mm/Makefile | 2 +-
mm/balloon_compaction.c | 174 ++++++++++++++++++++++
mm/compaction.c | 51 ++++---
mm/migrate.c | 57 +++++++-
mm/page_alloc.c | 2 +-
mm/vmstat.c | 10 +-
12 files changed, 715 insertions(+), 48 deletions(-)
create mode 100644 include/linux/balloon_compaction.h
create mode 100644 mm/balloon_compaction.c
Change log:
v9:
* Adjust rcu_dereference usage to leverage page lock protection (Paul, Peter);
* Enhance doc on compaction interface introduced to balloon driver (Michael);
* Fix issue with isolated pages breaking leak_balloon() logics (Michael);
v8:
* introduce a common MM interface for balloon driver page compaction (Michael);
* remove the global state preventing multiple balloon device support (Michael);
* introduce RCU protection/syncrhonization to balloon page->mapping (Michael);
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_rc3+ -- after a reboot)
* 64mB balloon:
[root@...alhost ~]# 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_released 0
compact_balloon_returned 0
[root@...alhost ~]#
[root@...alhost ~]# 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@...alhost ~]#
[root@...alhost ~]# awk '/compact/ {print}' /proc/vmstat
compact_blocks_moved 3108
compact_pages_moved 43169
compact_pagemigrate_failed 95
compact_stall 0
compact_fail 0
compact_success 0
compact_balloon_isolated 16384
compact_balloon_migrated 16384
compact_balloon_released 16384
compact_balloon_returned 0
* 128 mB balloon:
[root@...alhost ~]# 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_released 0
compact_balloon_returned 0
[root@...alhost ~]#
[root@...alhost ~]# 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@...alhost ~]#
[root@...alhost ~]# awk '/compact/ {print}' /proc/vmstat
compact_blocks_moved 3062
compact_pages_moved 49774
compact_pagemigrate_failed 129
compact_stall 0
compact_fail 0
compact_success 0
compact_balloon_isolated 26076
compact_balloon_migrated 25957
compact_balloon_released 25957
compact_balloon_returned 119
--
1.7.11.4
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