Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755538AbbGELYd (ORCPT ); Sun, 5 Jul 2015 07:24:33 -0400 Received: from mail-la0-f47.google.com ([209.85.215.47]:32947 "EHLO mail-la0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752411AbbGELYV (ORCPT ); Sun, 5 Jul 2015 07:24:21 -0400 MIME-Version: 1.0 In-Reply-To: <1435312710-15108-4-git-send-email-gioh.kim@lge.com> References: <1435312710-15108-1-git-send-email-gioh.kim@lge.com> <1435312710-15108-4-git-send-email-gioh.kim@lge.com> Date: Sat, 4 Jul 2015 21:55:38 +0300 Message-ID: Subject: Re: [RFCv2 3/5] mm/balloon: apply driver page migratable into balloon From: Konstantin Khlebnikov To: Gioh Kim Cc: Jeff Layton , Bruce Fields , Vlastimil Babka , Joonsoo Kim , Al Viro , "Michael S. Tsirkin" , Minchan Kim , Rafael Aquini , linux-fsdevel , virtualization@lists.linux-foundation.org, Linux Kernel Mailing List , Linux API , "linux-mm@kvack.org" , Andrew Morton Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9181 Lines: 238 On Fri, Jun 26, 2015 at 12:58 PM, Gioh Kim wrote: > Apply driver page migration into balloon driver. > > Signed-off-by: Gioh Kim > --- > drivers/virtio/virtio_balloon.c | 3 +++ > fs/proc/page.c | 3 +++ > include/linux/balloon_compaction.h | 33 +++++++++++++++++++++------------ > include/uapi/linux/kernel-page-flags.h | 2 +- > mm/balloon_compaction.c | 19 +++++++++++++++++-- > 5 files changed, 45 insertions(+), 15 deletions(-) > > diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c > index 82e80e0..c49b553 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -505,6 +505,9 @@ static int virtballoon_probe(struct virtio_device *vdev) > balloon_devinfo_init(&vb->vb_dev_info); > #ifdef CONFIG_BALLOON_COMPACTION > vb->vb_dev_info.migratepage = virtballoon_migratepage; > + vb->vb_dev_info.inode = anon_inode_new(); > + vb->vb_dev_info.inode->i_mapping->a_ops = &balloon_aops; > + mapping_set_migratable(vb->vb_dev_info.inode->i_mapping); > #endif > > err = init_vqs(vb); > diff --git a/fs/proc/page.c b/fs/proc/page.c > index 7eee2d8..2dc3673 100644 > --- a/fs/proc/page.c > +++ b/fs/proc/page.c > @@ -146,6 +146,9 @@ u64 stable_page_flags(struct page *page) > if (PageBalloon(page)) > u |= 1 << KPF_BALLOON; > > + if (PageMigratable(page)) > + u |= 1 << KPF_MIGRATABLE; > + > u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked); > > u |= kpf_copy_bit(k, KPF_SLAB, PG_slab); > diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h > index 9b0a15d..e8a3670 100644 > --- a/include/linux/balloon_compaction.h > +++ b/include/linux/balloon_compaction.h > @@ -48,6 +48,7 @@ > #include > #include > #include > +#include > > /* > * Balloon device information descriptor. > @@ -62,6 +63,7 @@ struct balloon_dev_info { > struct list_head pages; /* Pages enqueued & handled to Host */ > int (*migratepage)(struct balloon_dev_info *, struct page *newpage, > struct page *page, enum migrate_mode mode); > + struct inode *inode; > }; > > extern struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info); > @@ -73,24 +75,28 @@ static inline void balloon_devinfo_init(struct balloon_dev_info *balloon) > spin_lock_init(&balloon->pages_lock); > INIT_LIST_HEAD(&balloon->pages); > balloon->migratepage = NULL; > + balloon->inode = NULL; > } > > #ifdef CONFIG_BALLOON_COMPACTION > -extern bool balloon_page_isolate(struct page *page); > +extern const struct address_space_operations balloon_aops; > +extern bool balloon_page_isolate(struct page *page, > + isolate_mode_t mode); > extern void balloon_page_putback(struct page *page); > -extern int balloon_page_migrate(struct page *newpage, > +extern int balloon_page_migrate(struct address_space *mapping, > + struct page *newpage, > struct page *page, enum migrate_mode mode); > > /* > - * __is_movable_balloon_page - helper to perform @page PageBalloon tests > + * __is_movable_balloon_page - helper to perform @page PageMigratable tests > */ > static inline bool __is_movable_balloon_page(struct page *page) > { > - return PageBalloon(page); > + return PageMigratable(page); > } > > /* > - * balloon_page_movable - test PageBalloon to identify balloon pages > + * balloon_page_movable - test PageMigratable to identify balloon pages > * and PagePrivate to check that the page is not > * isolated and can be moved by compaction/migration. > * > @@ -99,7 +105,7 @@ static inline bool __is_movable_balloon_page(struct page *page) > */ > static inline bool balloon_page_movable(struct page *page) > { > - return PageBalloon(page) && PagePrivate(page); > + return PageMigratable(page) && PagePrivate(page); > } > > /* > @@ -108,7 +114,7 @@ static inline bool balloon_page_movable(struct page *page) > */ > static inline bool isolated_balloon_page(struct page *page) > { > - return PageBalloon(page); > + return PageMigratable(page); > } > > /* > @@ -123,7 +129,8 @@ static inline bool isolated_balloon_page(struct page *page) > static inline void balloon_page_insert(struct balloon_dev_info *balloon, > struct page *page) > { > - __SetPageBalloon(page); > + page->mapping = balloon->inode->i_mapping; > + __SetPageMigratable(page); > SetPagePrivate(page); > set_page_private(page, (unsigned long)balloon); > list_add(&page->lru, &balloon->pages); > @@ -139,7 +146,8 @@ static inline void balloon_page_insert(struct balloon_dev_info *balloon, > */ > static inline void balloon_page_delete(struct page *page) > { > - __ClearPageBalloon(page); > + page->mapping = NULL; > + __ClearPageMigratable(page); Please leave balloon pages marked as balloon. Just check them in migration code like: if (PageBalloon(page) || PageMobile(page)) ... > set_page_private(page, 0); > if (PagePrivate(page)) { > ClearPagePrivate(page); > @@ -166,13 +174,13 @@ static inline gfp_t balloon_mapping_gfp_mask(void) > static inline void balloon_page_insert(struct balloon_dev_info *balloon, > struct page *page) > { > - __SetPageBalloon(page); > + __SetPageMigratable(page); > list_add(&page->lru, &balloon->pages); > } > > static inline void balloon_page_delete(struct page *page) > { > - __ClearPageBalloon(page); > + __ClearPageMigratable(page); > list_del(&page->lru); > } > > @@ -191,7 +199,8 @@ static inline bool isolated_balloon_page(struct page *page) > return false; > } > > -static inline bool balloon_page_isolate(struct page *page) > +static inline bool balloon_page_isolate(struct page *page, > + isolate_mode_t mode) > { > return false; > } > diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h > index a6c4962..65db3a6 100644 > --- a/include/uapi/linux/kernel-page-flags.h > +++ b/include/uapi/linux/kernel-page-flags.h > @@ -33,6 +33,6 @@ > #define KPF_THP 22 > #define KPF_BALLOON 23 > #define KPF_ZERO_PAGE 24 > - > +#define KPF_MIGRATABLE 25 > > #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */ > diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c > index fcad832..df72846 100644 > --- a/mm/balloon_compaction.c > +++ b/mm/balloon_compaction.c > @@ -131,7 +131,7 @@ static inline void __putback_balloon_page(struct page *page) > } > > /* __isolate_lru_page() counterpart for a ballooned page */ > -bool balloon_page_isolate(struct page *page) > +bool balloon_page_isolate(struct page *page, isolate_mode_t mode) > { > /* > * Avoid burning cycles with pages that are yet under __free_pages(), > @@ -175,6 +175,9 @@ bool balloon_page_isolate(struct page *page) > /* putback_lru_page() counterpart for a ballooned page */ > void balloon_page_putback(struct page *page) > { > + if (!isolated_balloon_page(page)) > + return; > + > /* > * 'lock_page()' stabilizes the page and prevents races against > * concurrent isolation threads attempting to re-isolate it. > @@ -193,12 +196,16 @@ void balloon_page_putback(struct page *page) > } > > /* move_to_new_page() counterpart for a ballooned page */ > -int balloon_page_migrate(struct page *newpage, > +int balloon_page_migrate(struct address_space *mapping, > + struct page *newpage, > struct page *page, enum migrate_mode mode) > { > struct balloon_dev_info *balloon = balloon_page_device(page); > int rc = -EAGAIN; > > + if (!isolated_balloon_page(page)) > + return rc; > + > /* > * Block others from accessing the 'newpage' when we get around to > * establishing additional references. We should be the only one > @@ -218,4 +225,12 @@ int balloon_page_migrate(struct page *newpage, > unlock_page(newpage); > return rc; > } > + > +/* define the balloon_mapping->a_ops callback to allow balloon page migration */ > +const struct address_space_operations balloon_aops = { > + .migratepage = balloon_page_migrate, > + .isolatepage = balloon_page_isolate, > + .putbackpage = balloon_page_putback, > +}; > +EXPORT_SYMBOL_GPL(balloon_aops); > #endif /* CONFIG_BALLOON_COMPACTION */ > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/