From: Mel Gorman <mel@csn.ul.ie> To: Andrew Morton <akpm@linux-foundation.org> Cc: Andrea Arcangeli <aarcange@redhat.com>, Christoph Lameter <cl@linux-foundation.org>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, David Rientjes <rientjes@google.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating Date: Fri, 12 Mar 2010 16:41:17 +0000 [thread overview] Message-ID: <1268412087-13536-2-git-send-email-mel@csn.ul.ie> (raw) In-Reply-To: <1268412087-13536-1-git-send-email-mel@csn.ul.ie> rmap_walk_anon() does not use page_lock_anon_vma() for looking up and locking an anon_vma and it does not appear to have sufficient locking to ensure the anon_vma does not disappear from under it. This patch copies an approach used by KSM to take a reference on the anon_vma while pages are being migrated. This should prevent rmap_walk() running into nasty surprises later because anon_vma has been freed. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Rik van Riel <riel@redhat.com> --- include/linux/rmap.h | 23 +++++++++++++++++++++++ mm/migrate.c | 12 ++++++++++++ mm/rmap.c | 10 +++++----- 3 files changed, 40 insertions(+), 5 deletions(-) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index d25bd22..567d43f 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -29,6 +29,9 @@ struct anon_vma { #ifdef CONFIG_KSM atomic_t ksm_refcount; #endif +#ifdef CONFIG_MIGRATION + atomic_t migrate_refcount; +#endif /* * NOTE: the LSB of the head.next is set by * mm_take_all_locks() _after_ taking the above lock. So the @@ -81,6 +84,26 @@ static inline int ksm_refcount(struct anon_vma *anon_vma) return 0; } #endif /* CONFIG_KSM */ +#ifdef CONFIG_MIGRATION +static inline void migrate_refcount_init(struct anon_vma *anon_vma) +{ + atomic_set(&anon_vma->migrate_refcount, 0); +} + +static inline int migrate_refcount(struct anon_vma *anon_vma) +{ + return atomic_read(&anon_vma->migrate_refcount); +} +#else +static inline void migrate_refcount_init(struct anon_vma *anon_vma) +{ +} + +static inline int migrate_refcount(struct anon_vma *anon_vma) +{ + return 0; +} +#endif /* CONFIG_MIGRATE */ static inline struct anon_vma *page_anon_vma(struct page *page) { diff --git a/mm/migrate.c b/mm/migrate.c index 88000b8..98eaaf2 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -547,6 +547,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private, int rcu_locked = 0; int charge = 0; struct mem_cgroup *mem = NULL; + struct anon_vma *anon_vma = NULL; if (!newpage) return -ENOMEM; @@ -603,6 +604,8 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private, if (PageAnon(page)) { rcu_read_lock(); rcu_locked = 1; + anon_vma = page_anon_vma(page); + atomic_inc(&anon_vma->migrate_refcount); } /* @@ -642,6 +645,15 @@ skip_unmap: if (rc) remove_migration_ptes(page, page); rcu_unlock: + + /* Drop an anon_vma reference if we took one */ + if (anon_vma && atomic_dec_and_lock(&anon_vma->migrate_refcount, &anon_vma->lock)) { + int empty = list_empty(&anon_vma->head); + spin_unlock(&anon_vma->lock); + if (empty) + anon_vma_free(anon_vma); + } + if (rcu_locked) rcu_read_unlock(); uncharge: diff --git a/mm/rmap.c b/mm/rmap.c index fcd593c..578d0fe 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -248,7 +248,8 @@ static void anon_vma_unlink(struct anon_vma_chain *anon_vma_chain) list_del(&anon_vma_chain->same_anon_vma); /* We must garbage collect the anon_vma if it's empty */ - empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma); + empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma) && + !migrate_refcount(anon_vma); spin_unlock(&anon_vma->lock); if (empty) @@ -273,6 +274,7 @@ static void anon_vma_ctor(void *data) spin_lock_init(&anon_vma->lock); ksm_refcount_init(anon_vma); + migrate_refcount_init(anon_vma); INIT_LIST_HEAD(&anon_vma->head); } @@ -1338,10 +1340,8 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *, /* * Note: remove_migration_ptes() cannot use page_lock_anon_vma() * because that depends on page_mapped(); but not all its usages - * are holding mmap_sem, which also gave the necessary guarantee - * (that this anon_vma's slab has not already been destroyed). - * This needs to be reviewed later: avoiding page_lock_anon_vma() - * is risky, and currently limits the usefulness of rmap_walk(). + * are holding mmap_sem. Users without mmap_sem are required to + * take a reference count to prevent the anon_vma disappearing */ anon_vma = page_anon_vma(page); if (!anon_vma) -- 1.6.5
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mel@csn.ul.ie> To: Andrew Morton <akpm@linux-foundation.org> Cc: Andrea Arcangeli <aarcange@redhat.com>, Christoph Lameter <cl@linux-foundation.org>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, David Rientjes <rientjes@google.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating Date: Fri, 12 Mar 2010 16:41:17 +0000 [thread overview] Message-ID: <1268412087-13536-2-git-send-email-mel@csn.ul.ie> (raw) In-Reply-To: <1268412087-13536-1-git-send-email-mel@csn.ul.ie> rmap_walk_anon() does not use page_lock_anon_vma() for looking up and locking an anon_vma and it does not appear to have sufficient locking to ensure the anon_vma does not disappear from under it. This patch copies an approach used by KSM to take a reference on the anon_vma while pages are being migrated. This should prevent rmap_walk() running into nasty surprises later because anon_vma has been freed. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Rik van Riel <riel@redhat.com> --- include/linux/rmap.h | 23 +++++++++++++++++++++++ mm/migrate.c | 12 ++++++++++++ mm/rmap.c | 10 +++++----- 3 files changed, 40 insertions(+), 5 deletions(-) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index d25bd22..567d43f 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -29,6 +29,9 @@ struct anon_vma { #ifdef CONFIG_KSM atomic_t ksm_refcount; #endif +#ifdef CONFIG_MIGRATION + atomic_t migrate_refcount; +#endif /* * NOTE: the LSB of the head.next is set by * mm_take_all_locks() _after_ taking the above lock. So the @@ -81,6 +84,26 @@ static inline int ksm_refcount(struct anon_vma *anon_vma) return 0; } #endif /* CONFIG_KSM */ +#ifdef CONFIG_MIGRATION +static inline void migrate_refcount_init(struct anon_vma *anon_vma) +{ + atomic_set(&anon_vma->migrate_refcount, 0); +} + +static inline int migrate_refcount(struct anon_vma *anon_vma) +{ + return atomic_read(&anon_vma->migrate_refcount); +} +#else +static inline void migrate_refcount_init(struct anon_vma *anon_vma) +{ +} + +static inline int migrate_refcount(struct anon_vma *anon_vma) +{ + return 0; +} +#endif /* CONFIG_MIGRATE */ static inline struct anon_vma *page_anon_vma(struct page *page) { diff --git a/mm/migrate.c b/mm/migrate.c index 88000b8..98eaaf2 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -547,6 +547,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private, int rcu_locked = 0; int charge = 0; struct mem_cgroup *mem = NULL; + struct anon_vma *anon_vma = NULL; if (!newpage) return -ENOMEM; @@ -603,6 +604,8 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private, if (PageAnon(page)) { rcu_read_lock(); rcu_locked = 1; + anon_vma = page_anon_vma(page); + atomic_inc(&anon_vma->migrate_refcount); } /* @@ -642,6 +645,15 @@ skip_unmap: if (rc) remove_migration_ptes(page, page); rcu_unlock: + + /* Drop an anon_vma reference if we took one */ + if (anon_vma && atomic_dec_and_lock(&anon_vma->migrate_refcount, &anon_vma->lock)) { + int empty = list_empty(&anon_vma->head); + spin_unlock(&anon_vma->lock); + if (empty) + anon_vma_free(anon_vma); + } + if (rcu_locked) rcu_read_unlock(); uncharge: diff --git a/mm/rmap.c b/mm/rmap.c index fcd593c..578d0fe 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -248,7 +248,8 @@ static void anon_vma_unlink(struct anon_vma_chain *anon_vma_chain) list_del(&anon_vma_chain->same_anon_vma); /* We must garbage collect the anon_vma if it's empty */ - empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma); + empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma) && + !migrate_refcount(anon_vma); spin_unlock(&anon_vma->lock); if (empty) @@ -273,6 +274,7 @@ static void anon_vma_ctor(void *data) spin_lock_init(&anon_vma->lock); ksm_refcount_init(anon_vma); + migrate_refcount_init(anon_vma); INIT_LIST_HEAD(&anon_vma->head); } @@ -1338,10 +1340,8 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *, /* * Note: remove_migration_ptes() cannot use page_lock_anon_vma() * because that depends on page_mapped(); but not all its usages - * are holding mmap_sem, which also gave the necessary guarantee - * (that this anon_vma's slab has not already been destroyed). - * This needs to be reviewed later: avoiding page_lock_anon_vma() - * is risky, and currently limits the usefulness of rmap_walk(). + * are holding mmap_sem. Users without mmap_sem are required to + * take a reference count to prevent the anon_vma disappearing */ anon_vma = page_anon_vma(page); if (!anon_vma) -- 1.6.5 -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-03-12 16:41 UTC|newest] Thread overview: 214+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-03-12 16:41 [PATCH 0/11] Memory Compaction v4 Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-12 16:41 ` Mel Gorman [this message] 2010-03-12 16:41 ` [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating Mel Gorman 2010-03-14 15:01 ` Minchan Kim 2010-03-14 15:01 ` Minchan Kim 2010-03-15 5:06 ` KAMEZAWA Hiroyuki 2010-03-15 5:06 ` KAMEZAWA Hiroyuki 2010-03-17 1:44 ` KOSAKI Motohiro 2010-03-17 1:44 ` KOSAKI Motohiro 2010-03-17 11:45 ` Mel Gorman 2010-03-17 11:45 ` Mel Gorman 2010-03-17 16:38 ` Christoph Lameter 2010-03-17 16:38 ` Christoph Lameter 2010-03-18 11:12 ` Mel Gorman 2010-03-18 11:12 ` Mel Gorman 2010-03-18 16:31 ` Christoph Lameter 2010-03-18 16:31 ` Christoph Lameter 2010-03-12 16:41 ` [PATCH 02/11] mm,migration: Do not try to migrate unmapped anonymous pages Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-15 0:28 ` Minchan Kim 2010-03-15 0:28 ` Minchan Kim 2010-03-15 5:34 ` KAMEZAWA Hiroyuki 2010-03-15 5:34 ` KAMEZAWA Hiroyuki 2010-03-15 6:28 ` Minchan Kim 2010-03-15 6:28 ` Minchan Kim 2010-03-15 6:44 ` KAMEZAWA Hiroyuki 2010-03-15 6:44 ` KAMEZAWA Hiroyuki 2010-03-15 7:09 ` KAMEZAWA Hiroyuki 2010-03-15 7:09 ` KAMEZAWA Hiroyuki 2010-03-15 13:48 ` Minchan Kim 2010-03-15 13:48 ` Minchan Kim 2010-03-15 7:11 ` Minchan Kim 2010-03-15 7:11 ` Minchan Kim 2010-03-15 11:28 ` Mel Gorman 2010-03-15 11:28 ` Mel Gorman 2010-03-15 12:48 ` Minchan Kim 2010-03-15 12:48 ` Minchan Kim 2010-03-15 14:21 ` Mel Gorman 2010-03-15 14:21 ` Mel Gorman 2010-03-15 14:33 ` Minchan Kim 2010-03-15 14:33 ` Minchan Kim 2010-03-15 23:49 ` KAMEZAWA Hiroyuki 2010-03-15 23:49 ` KAMEZAWA Hiroyuki 2010-03-17 2:12 ` KAMEZAWA Hiroyuki 2010-03-17 2:12 ` KAMEZAWA Hiroyuki 2010-03-17 3:00 ` Minchan Kim 2010-03-17 3:00 ` Minchan Kim 2010-03-17 3:15 ` KAMEZAWA Hiroyuki 2010-03-17 3:15 ` KAMEZAWA Hiroyuki 2010-03-17 4:15 ` Minchan Kim 2010-03-17 4:15 ` Minchan Kim 2010-03-17 4:19 ` KAMEZAWA Hiroyuki 2010-03-17 4:19 ` KAMEZAWA Hiroyuki 2010-03-17 16:41 ` Christoph Lameter 2010-03-17 16:41 ` Christoph Lameter 2010-03-18 0:30 ` KAMEZAWA Hiroyuki 2010-03-18 0:30 ` KAMEZAWA Hiroyuki 2010-03-17 12:07 ` Mel Gorman 2010-03-17 12:07 ` Mel Gorman 2010-03-17 2:03 ` KOSAKI Motohiro 2010-03-17 2:03 ` KOSAKI Motohiro 2010-03-17 11:51 ` Mel Gorman 2010-03-17 11:51 ` Mel Gorman 2010-03-18 0:48 ` KOSAKI Motohiro 2010-03-18 0:48 ` KOSAKI Motohiro 2010-03-18 11:14 ` Mel Gorman 2010-03-18 11:14 ` Mel Gorman 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 8:59 ` Mel Gorman 2010-03-19 8:59 ` Mel Gorman 2010-03-25 2:49 ` KOSAKI Motohiro 2010-03-25 2:49 ` KOSAKI Motohiro 2010-03-25 8:32 ` Mel Gorman 2010-03-25 8:32 ` Mel Gorman 2010-03-25 8:56 ` KOSAKI Motohiro 2010-03-25 8:56 ` KOSAKI Motohiro 2010-03-25 9:18 ` Mel Gorman 2010-03-25 9:18 ` Mel Gorman 2010-03-25 9:02 ` KAMEZAWA Hiroyuki 2010-03-25 9:02 ` KAMEZAWA Hiroyuki 2010-03-25 9:09 ` KOSAKI Motohiro 2010-03-25 9:09 ` KOSAKI Motohiro 2010-03-25 9:08 ` KAMEZAWA Hiroyuki 2010-03-25 9:08 ` KAMEZAWA Hiroyuki 2010-03-25 9:21 ` Mel Gorman 2010-03-25 9:21 ` Mel Gorman 2010-03-25 9:41 ` KAMEZAWA Hiroyuki 2010-03-25 9:41 ` KAMEZAWA Hiroyuki 2010-03-25 9:59 ` KOSAKI Motohiro 2010-03-25 9:59 ` KOSAKI Motohiro 2010-03-25 10:12 ` KAMEZAWA Hiroyuki 2010-03-25 10:12 ` KAMEZAWA Hiroyuki 2010-03-25 13:39 ` Mel Gorman 2010-03-25 13:39 ` Mel Gorman 2010-03-26 3:07 ` KOSAKI Motohiro 2010-03-26 3:07 ` KOSAKI Motohiro 2010-03-26 13:49 ` Mel Gorman 2010-03-26 13:49 ` Mel Gorman 2010-03-25 15:29 ` Minchan Kim 2010-03-25 15:29 ` Minchan Kim 2010-03-26 0:58 ` KAMEZAWA Hiroyuki 2010-03-26 0:58 ` KAMEZAWA Hiroyuki 2010-03-26 1:39 ` Minchan Kim 2010-03-26 1:39 ` Minchan Kim 2010-03-25 14:35 ` Christoph Lameter 2010-03-25 14:35 ` Christoph Lameter 2010-03-25 16:16 ` Minchan Kim 2010-03-25 16:16 ` Minchan Kim 2010-03-12 16:41 ` [PATCH 03/11] mm: Share the anon_vma ref counts between KSM and page migration Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-12 17:14 ` Rik van Riel 2010-03-12 17:14 ` Rik van Riel 2010-03-15 5:35 ` KAMEZAWA Hiroyuki 2010-03-15 5:35 ` KAMEZAWA Hiroyuki 2010-03-17 2:06 ` KOSAKI Motohiro 2010-03-17 2:06 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-17 2:28 ` KOSAKI Motohiro 2010-03-17 2:28 ` KOSAKI Motohiro 2010-03-17 11:32 ` Mel Gorman 2010-03-17 11:32 ` Mel Gorman 2010-03-17 16:37 ` Christoph Lameter 2010-03-17 16:37 ` Christoph Lameter 2010-03-17 23:56 ` KOSAKI Motohiro 2010-03-17 23:56 ` KOSAKI Motohiro 2010-03-18 11:24 ` Mel Gorman 2010-03-18 11:24 ` Mel Gorman 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 10:16 ` Mel Gorman 2010-03-19 10:16 ` Mel Gorman 2010-03-25 3:28 ` KOSAKI Motohiro 2010-03-25 3:28 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 05/11] Export unusable free space index via /proc/unusable_index Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-15 5:41 ` KAMEZAWA Hiroyuki 2010-03-15 5:41 ` KAMEZAWA Hiroyuki 2010-03-15 9:48 ` Mel Gorman 2010-03-15 9:48 ` Mel Gorman 2010-03-17 2:42 ` KOSAKI Motohiro 2010-03-17 2:42 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 06/11] Export fragmentation index via /proc/extfrag_index Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-17 2:49 ` KOSAKI Motohiro 2010-03-17 2:49 ` KOSAKI Motohiro 2010-03-17 11:33 ` Mel Gorman 2010-03-17 11:33 ` Mel Gorman 2010-03-23 0:22 ` KOSAKI Motohiro 2010-03-23 0:22 ` KOSAKI Motohiro 2010-03-23 12:03 ` Mel Gorman 2010-03-23 12:03 ` Mel Gorman 2010-03-25 2:47 ` KOSAKI Motohiro 2010-03-25 2:47 ` KOSAKI Motohiro 2010-03-25 8:47 ` Mel Gorman 2010-03-25 8:47 ` Mel Gorman 2010-03-25 11:20 ` KOSAKI Motohiro 2010-03-25 11:20 ` KOSAKI Motohiro 2010-03-25 14:11 ` Mel Gorman 2010-03-25 14:11 ` Mel Gorman 2010-03-26 3:10 ` KOSAKI Motohiro 2010-03-26 3:10 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 07/11] Memory compaction core Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-15 13:44 ` Minchan Kim 2010-03-15 13:44 ` Minchan Kim 2010-03-15 14:41 ` Mel Gorman 2010-03-15 14:41 ` Mel Gorman 2010-03-17 10:31 ` KOSAKI Motohiro 2010-03-17 10:31 ` KOSAKI Motohiro 2010-03-17 11:40 ` Mel Gorman 2010-03-17 11:40 ` Mel Gorman 2010-03-18 2:35 ` KOSAKI Motohiro 2010-03-18 2:35 ` KOSAKI Motohiro 2010-03-18 11:43 ` Mel Gorman 2010-03-18 11:43 ` Mel Gorman 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-18 17:08 ` Mel Gorman 2010-03-18 17:08 ` Mel Gorman 2010-03-12 16:41 ` [PATCH 08/11] Add /proc trigger for memory compaction Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-17 3:18 ` KOSAKI Motohiro 2010-03-17 3:18 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 09/11] Add /sys trigger for per-node " Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-17 3:18 ` KOSAKI Motohiro 2010-03-17 3:18 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 10/11] Direct compact when a high-order allocation fails Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-16 2:47 ` Minchan Kim 2010-03-16 2:47 ` Minchan Kim 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 6:21 ` KOSAKI Motohiro 2010-03-19 6:31 ` KOSAKI Motohiro 2010-03-19 6:31 ` KOSAKI Motohiro 2010-03-19 10:10 ` Mel Gorman 2010-03-19 10:10 ` Mel Gorman 2010-03-25 11:22 ` KOSAKI Motohiro 2010-03-25 11:22 ` KOSAKI Motohiro 2010-03-19 10:09 ` Mel Gorman 2010-03-19 10:09 ` Mel Gorman 2010-03-25 11:08 ` KOSAKI Motohiro 2010-03-25 11:08 ` KOSAKI Motohiro 2010-03-25 15:11 ` Mel Gorman 2010-03-25 15:11 ` Mel Gorman 2010-03-26 6:01 ` KOSAKI Motohiro 2010-03-26 6:01 ` KOSAKI Motohiro 2010-03-12 16:41 ` [PATCH 11/11] Do not compact within a preferred zone after a compaction failure Mel Gorman 2010-03-12 16:41 ` Mel Gorman 2010-03-23 12:25 [PATCH 0/11] Memory Compaction v5 Mel Gorman 2010-03-23 12:25 ` [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating Mel Gorman 2010-03-23 12:25 ` Mel Gorman
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