From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f171.google.com (mail-pd0-f171.google.com [209.85.192.171]) by kanga.kvack.org (Postfix) with ESMTP id C24C29003C7 for ; Tue, 7 Jul 2015 00:34:44 -0400 (EDT) Received: by pdbep18 with SMTP id ep18so118084390pdb.1 for ; Mon, 06 Jul 2015 21:34:44 -0700 (PDT) Received: from lgemrelse6q.lge.com (LGEMRELSE6Q.lge.com. [156.147.1.121]) by mx.google.com with ESMTP id bw10si32449189pdb.206.2015.07.06.21.34.42 for ; Mon, 06 Jul 2015 21:34:43 -0700 (PDT) From: Gioh Kim Subject: [RFCv3 0/5] enable migration of driver pages Date: Tue, 7 Jul 2015 13:36:20 +0900 Message-Id: <1436243785-24105-1-git-send-email-gioh.kim@lge.com> Sender: owner-linux-mm@kvack.org List-ID: To: jlayton@poochiereds.net, bfields@fieldses.org, vbabka@suse.cz, iamjoonsoo.kim@lge.com, viro@zeniv.linux.org.uk, mst@redhat.com, koct9i@gmail.com, minchan@kernel.org, aquini@redhat.com, linux-fsdevel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org Cc: gunho.lee@lge.com, akpm@linux-foundation.org, Gioh Kim From: Gioh Kim Hello, This series try to enable migration of non-LRU pages, such as driver's page. My ARM-based platform occured severe fragmentation problem after long-term (several days) test. Sometimes even order-3 page allocation failed. It has memory size 512MB ~ 1024MB. 30% ~ 40% memory is consumed for graphic processing and 20~30 memory is reserved for zram. I found that many pages of GPU driver and zram are non-movable pages. So I reported Minchan Kim, the maintainer of zram, and he made the internal compaction logic of zram. And I made the internal compaction of GPU driver. They reduced some fragmentation but they are not enough effective. They are activated by its own interface, /sys, so they are not cooperative with kernel compaction. If there is too much fragmentation and kernel starts to compaction, zram and GPU driver cannot work with the kernel compaction. This patch set combines 5 patches. 1. patch 1/5: get inode from anon_inodes This patch adds new interface to create inode from anon_inodes. 2. patch 2/5: framework to isolate/migrate/putback page Add isolatepage, putbackpage into address_space_operations and wrapper function to call them 3. patch 3/5: apply the framework into balloon driver The balloon driver is applied into the framework. It gets a inode from anon_inodes and register operations in the inode. Any other drivers can register operations via inode like this to migrate it's pages. 4. patch 4/5: compaction/migration call the generic interfaces Compaction and migration pages call the generic interfaces of the framework, instead of calling balloon migration directly. 5. patch 5/5: remove direct calling of migration of driver pages Non-lru pages are migrated with lru pages by move_to_new_page(). This patch set is tested: - turn on Ubuntu 14.04 with 1G memory on qemu. - do kernel building - after several seconds check more than 512MB is used with free command - command "balloon 512" in qemu monitor - check hundreds MB of pages are migrated My thanks to Konstantin Khlebnikov for his reviews of the v2 patch set. Most of the changes were based on his feedback. Changes since v2: - change the name of page type from migratable page into mobile page - get and lock page to isolate page - add wrapper interfaces for page->mapping->a_ops->isolate/putback - leave balloon pages marked as balloon This patch-set is based on v4.1 Gioh Kim (5): fs/anon_inodes: new interface to create new inode mm/compaction: enable mobile-page migration mm/balloon: apply mobile page migratable into balloon mm/compaction: call generic migration callbacks mm: remove direct calling of migration drivers/virtio/virtio_balloon.c | 3 ++ fs/anon_inodes.c | 6 +++ fs/proc/page.c | 3 ++ include/linux/anon_inodes.h | 1 + include/linux/balloon_compaction.h | 15 +++++-- include/linux/compaction.h | 76 ++++++++++++++++++++++++++++++++++ include/linux/fs.h | 2 + include/linux/page-flags.h | 19 +++++++++ include/uapi/linux/kernel-page-flags.h | 1 + mm/balloon_compaction.c | 71 ++++++++++--------------------- mm/compaction.c | 8 ++-- mm/migrate.c | 24 +++-------- 12 files changed, 154 insertions(+), 75 deletions(-) -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org