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Message-Id: <cover.1344619987.git.aquini@redhat.com>
Date: Fri, 10 Aug 2012 14:55:13 -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>,
Rafael Aquini <aquini@...hat.com>
Subject: [PATCH v7 0/4] 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 (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@...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_returned 0
compact_balloon_released 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 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@...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_returned 0
compact_balloon_released 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 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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