From: David Rientjes <rientjes@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Greg Thelen <gthelen@google.com>, Hugh Dickins <hughd@google.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [patch v3 2/6] mm, compaction: return failed migration target pages back to freelist Date: Tue, 6 May 2014 19:22:43 -0700 (PDT) [thread overview] Message-ID: <alpine.DEB.2.02.1405061921040.18635@chino.kir.corp.google.com> (raw) In-Reply-To: <alpine.DEB.2.02.1405061920470.18635@chino.kir.corp.google.com> Memory compaction works by having a "freeing scanner" scan from one end of a zone which isolates pages as migration targets while another "migrating scanner" scans from the other end of the same zone which isolates pages for migration. When page migration fails for an isolated page, the target page is returned to the system rather than the freelist built by the freeing scanner. This may require the freeing scanner to continue scanning memory after suitable migration targets have already been returned to the system needlessly. This patch returns destination pages to the freeing scanner freelist when page migration fails. This prevents unnecessary work done by the freeing scanner but also encourages memory to be as compacted as possible at the end of the zone. Reported-by: Greg Thelen <gthelen@google.com> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: David Rientjes <rientjes@google.com> --- mm/compaction.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c --- a/mm/compaction.c +++ b/mm/compaction.c @@ -797,23 +797,32 @@ static struct page *compaction_alloc(struct page *migratepage, } /* - * We cannot control nr_migratepages and nr_freepages fully when migration is - * running as migrate_pages() has no knowledge of compact_control. When - * migration is complete, we count the number of pages on the lists by hand. + * This is a migrate-callback that "frees" freepages back to the isolated + * freelist. All pages on the freelist are from the same zone, so there is no + * special handling needed for NUMA. + */ +static void compaction_free(struct page *page, unsigned long data) +{ + struct compact_control *cc = (struct compact_control *)data; + + list_add(&page->lru, &cc->freepages); + cc->nr_freepages++; +} + +/* + * We cannot control nr_migratepages fully when migration is running as + * migrate_pages() has no knowledge of of compact_control. When migration is + * complete, we count the number of pages on the list by hand. */ static void update_nr_listpages(struct compact_control *cc) { int nr_migratepages = 0; - int nr_freepages = 0; struct page *page; list_for_each_entry(page, &cc->migratepages, lru) nr_migratepages++; - list_for_each_entry(page, &cc->freepages, lru) - nr_freepages++; cc->nr_migratepages = nr_migratepages; - cc->nr_freepages = nr_freepages; } /* possible outcome of isolate_migratepages */ @@ -1023,8 +1032,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) } nr_migrate = cc->nr_migratepages; - err = migrate_pages(&cc->migratepages, compaction_alloc, NULL, - (unsigned long)cc, + err = migrate_pages(&cc->migratepages, compaction_alloc, + compaction_free, (unsigned long)cc, cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC, MR_COMPACTION); update_nr_listpages(cc);
WARNING: multiple messages have this Message-ID (diff)
From: David Rientjes <rientjes@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Greg Thelen <gthelen@google.com>, Hugh Dickins <hughd@google.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [patch v3 2/6] mm, compaction: return failed migration target pages back to freelist Date: Tue, 6 May 2014 19:22:43 -0700 (PDT) [thread overview] Message-ID: <alpine.DEB.2.02.1405061921040.18635@chino.kir.corp.google.com> (raw) In-Reply-To: <alpine.DEB.2.02.1405061920470.18635@chino.kir.corp.google.com> Memory compaction works by having a "freeing scanner" scan from one end of a zone which isolates pages as migration targets while another "migrating scanner" scans from the other end of the same zone which isolates pages for migration. When page migration fails for an isolated page, the target page is returned to the system rather than the freelist built by the freeing scanner. This may require the freeing scanner to continue scanning memory after suitable migration targets have already been returned to the system needlessly. This patch returns destination pages to the freeing scanner freelist when page migration fails. This prevents unnecessary work done by the freeing scanner but also encourages memory to be as compacted as possible at the end of the zone. Reported-by: Greg Thelen <gthelen@google.com> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: David Rientjes <rientjes@google.com> --- mm/compaction.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c --- a/mm/compaction.c +++ b/mm/compaction.c @@ -797,23 +797,32 @@ static struct page *compaction_alloc(struct page *migratepage, } /* - * We cannot control nr_migratepages and nr_freepages fully when migration is - * running as migrate_pages() has no knowledge of compact_control. When - * migration is complete, we count the number of pages on the lists by hand. + * This is a migrate-callback that "frees" freepages back to the isolated + * freelist. All pages on the freelist are from the same zone, so there is no + * special handling needed for NUMA. + */ +static void compaction_free(struct page *page, unsigned long data) +{ + struct compact_control *cc = (struct compact_control *)data; + + list_add(&page->lru, &cc->freepages); + cc->nr_freepages++; +} + +/* + * We cannot control nr_migratepages fully when migration is running as + * migrate_pages() has no knowledge of of compact_control. When migration is + * complete, we count the number of pages on the list by hand. */ static void update_nr_listpages(struct compact_control *cc) { int nr_migratepages = 0; - int nr_freepages = 0; struct page *page; list_for_each_entry(page, &cc->migratepages, lru) nr_migratepages++; - list_for_each_entry(page, &cc->freepages, lru) - nr_freepages++; cc->nr_migratepages = nr_migratepages; - cc->nr_freepages = nr_freepages; } /* possible outcome of isolate_migratepages */ @@ -1023,8 +1032,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) } nr_migrate = cc->nr_migratepages; - err = migrate_pages(&cc->migratepages, compaction_alloc, NULL, - (unsigned long)cc, + err = migrate_pages(&cc->migratepages, compaction_alloc, + compaction_free, (unsigned long)cc, cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC, MR_COMPACTION); update_nr_listpages(cc); -- 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:[~2014-05-07 2:22 UTC|newest] Thread overview: 267+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-05-01 0:45 [patch 1/2] mm, migration: add destination page freeing callback David Rientjes 2014-05-01 0:45 ` David Rientjes 2014-05-01 0:45 ` [patch 2/2] mm, compaction: return failed migration target pages back to freelist David Rientjes 2014-05-01 0:45 ` David Rientjes 2014-05-01 5:10 ` Naoya Horiguchi 2014-05-01 21:02 ` David Rientjes 2014-05-01 21:02 ` David Rientjes 2014-05-01 5:08 ` [patch 1/2] mm, migration: add destination page freeing callback Naoya Horiguchi [not found] ` <5361d71e.236ec20a.1b3d.ffffc8aeSMTPIN_ADDED_BROKEN@mx.google.com> 2014-05-01 21:02 ` David Rientjes 2014-05-01 21:02 ` David Rientjes 2014-05-01 21:35 ` [patch v2 1/4] " David Rientjes 2014-05-01 21:35 ` David Rientjes 2014-05-01 21:35 ` [patch v2 2/4] mm, compaction: return failed migration target pages back to freelist David Rientjes 2014-05-01 21:35 ` David Rientjes 2014-05-02 10:11 ` Mel Gorman 2014-05-02 10:11 ` Mel Gorman 2014-05-02 15:23 ` Vlastimil Babka 2014-05-02 15:23 ` Vlastimil Babka 2014-05-02 15:26 ` [PATCH] mm/compaction: do not count migratepages when unnecessary Vlastimil Babka 2014-05-06 21:18 ` Naoya Horiguchi [not found] ` <1399411134-k43fsr0p@n-horiguchi@ah.jp.nec.com> 2014-05-07 9:33 ` Vlastimil Babka 2014-05-07 9:33 ` Vlastimil Babka 2014-05-02 15:27 ` [PATCH 2/2] mm/compaction: avoid rescanning pageblocks in isolate_freepages Vlastimil Babka 2014-05-02 15:27 ` Vlastimil Babka 2014-05-06 22:19 ` Naoya Horiguchi [not found] ` <1399414778-xakujfb3@n-horiguchi@ah.jp.nec.com> 2014-05-07 9:22 ` Vlastimil Babka 2014-05-07 9:22 ` Vlastimil Babka 2014-05-02 15:29 ` [PATCH 1/2] mm/compaction: do not count migratepages when unnecessary Vlastimil Babka 2014-05-02 15:29 ` Vlastimil Babka 2014-05-01 21:35 ` [patch v2 3/4] mm, compaction: add per-zone migration pfn cache for async compaction David Rientjes 2014-05-01 21:35 ` David Rientjes 2014-05-05 9:34 ` Vlastimil Babka 2014-05-05 9:34 ` Vlastimil Babka 2014-05-05 9:51 ` David Rientjes 2014-05-05 9:51 ` David Rientjes 2014-05-05 14:24 ` Vlastimil Babka 2014-05-05 14:24 ` Vlastimil Babka 2014-05-06 0:29 ` David Rientjes 2014-05-06 0:29 ` David Rientjes 2014-05-06 11:52 ` Vlastimil Babka 2014-05-06 11:52 ` Vlastimil Babka 2014-05-01 21:35 ` [patch v2 4/4] mm, thp: do not perform sync compaction on pagefault David Rientjes 2014-05-01 21:35 ` David Rientjes 2014-05-02 10:22 ` Mel Gorman 2014-05-02 10:22 ` Mel Gorman 2014-05-02 11:22 ` David Rientjes 2014-05-02 11:22 ` David Rientjes 2014-05-02 11:58 ` Mel Gorman 2014-05-02 20:29 ` David Rientjes 2014-05-02 20:29 ` David Rientjes 2014-05-05 14:48 ` Vlastimil Babka 2014-05-05 14:48 ` Vlastimil Babka 2014-05-06 8:55 ` Mel Gorman 2014-05-06 8:55 ` Mel Gorman 2014-05-06 15:05 ` Vlastimil Babka 2014-05-06 15:05 ` Vlastimil Babka 2014-05-02 10:10 ` [patch v2 1/4] mm, migration: add destination page freeing callback Mel Gorman 2014-05-07 2:22 ` [patch v3 1/6] " David Rientjes 2014-05-07 2:22 ` David Rientjes 2014-05-07 2:22 ` David Rientjes [this message] 2014-05-07 2:22 ` [patch v3 2/6] mm, compaction: return failed migration target pages back to freelist David Rientjes 2014-05-07 14:14 ` Naoya Horiguchi 2014-05-07 21:15 ` Andrew Morton 2014-05-07 21:15 ` Andrew Morton 2014-05-07 21:21 ` David Rientjes 2014-05-07 21:21 ` David Rientjes 2014-05-12 8:35 ` Vlastimil Babka 2014-05-12 8:35 ` Vlastimil Babka 2014-05-07 21:39 ` Greg Thelen 2014-05-07 21:39 ` Greg Thelen 2014-05-12 8:37 ` Vlastimil Babka 2014-05-12 8:37 ` Vlastimil Babka 2014-05-07 2:22 ` [patch v3 3/6] mm, compaction: add per-zone migration pfn cache for async compaction David Rientjes 2014-05-07 2:22 ` David Rientjes 2014-05-07 9:34 ` Vlastimil Babka 2014-05-07 9:34 ` Vlastimil Babka 2014-05-07 20:56 ` Naoya Horiguchi 2014-05-07 2:22 ` [patch v3 4/6] mm, compaction: embed migration mode in compact_control David Rientjes 2014-05-07 2:22 ` David Rientjes 2014-05-07 9:55 ` Vlastimil Babka 2014-05-07 9:55 ` Vlastimil Babka 2014-05-07 10:36 ` [patch v4 " David Rientjes 2014-05-07 10:36 ` David Rientjes 2014-05-09 22:03 ` Andrew Morton 2014-05-09 22:03 ` Andrew Morton 2014-05-07 2:22 ` [patch v3 5/6] mm, thp: avoid excessive compaction latency during fault David Rientjes 2014-05-07 2:22 ` David Rientjes 2014-05-07 9:39 ` Mel Gorman 2014-05-07 9:39 ` Mel Gorman 2014-05-08 5:30 ` [patch -mm] mm, thp: avoid excessive compaction latency during fault fix David Rientjes 2014-05-08 5:30 ` David Rientjes 2014-05-13 10:00 ` Vlastimil Babka 2014-05-13 10:00 ` Vlastimil Babka 2014-05-22 2:49 ` David Rientjes 2014-05-22 2:49 ` David Rientjes 2014-05-22 8:43 ` Vlastimil Babka 2014-05-22 8:43 ` Vlastimil Babka 2014-05-07 2:22 ` [patch v3 6/6] mm, compaction: terminate async compaction when rescheduling David Rientjes 2014-05-07 2:22 ` David Rientjes 2014-05-07 9:41 ` Mel Gorman 2014-05-07 9:41 ` Mel Gorman 2014-05-07 12:09 ` [PATCH v2 1/2] mm/compaction: do not count migratepages when unnecessary Vlastimil Babka 2014-05-07 12:09 ` Vlastimil Babka 2014-05-07 12:09 ` [PATCH v2 2/2] mm/compaction: avoid rescanning pageblocks in isolate_freepages Vlastimil Babka 2014-05-07 12:09 ` Vlastimil Babka 2014-05-07 21:47 ` David Rientjes 2014-05-07 21:47 ` David Rientjes 2014-05-07 22:06 ` Naoya Horiguchi 2014-05-08 5:28 ` Joonsoo Kim 2014-05-08 5:28 ` Joonsoo Kim 2014-05-12 9:09 ` Vlastimil Babka 2014-05-12 9:09 ` Vlastimil Babka 2014-05-13 1:15 ` Joonsoo Kim 2014-05-13 1:15 ` Joonsoo Kim 2014-05-09 15:49 ` Michal Nazarewicz 2014-05-09 15:49 ` Michal Nazarewicz 2014-05-19 10:14 ` Vlastimil Babka 2014-05-19 10:14 ` Vlastimil Babka 2014-05-22 2:51 ` David Rientjes 2014-05-22 2:51 ` David Rientjes 2014-05-07 21:44 ` [PATCH v2 1/2] mm/compaction: do not count migratepages when unnecessary David Rientjes 2014-05-07 21:44 ` David Rientjes 2014-05-09 15:48 ` Michal Nazarewicz 2014-05-09 15:48 ` Michal Nazarewicz 2014-05-12 9:51 ` Vlastimil Babka 2014-05-12 9:51 ` Vlastimil Babka 2014-05-07 12:10 ` [patch v3 6/6] mm, compaction: terminate async compaction when rescheduling Vlastimil Babka 2014-05-07 12:10 ` Vlastimil Babka 2014-05-07 21:20 ` Andrew Morton 2014-05-07 21:20 ` Andrew Morton 2014-05-07 21:28 ` David Rientjes 2014-05-07 21:28 ` David Rientjes 2014-05-08 5:17 ` Joonsoo Kim 2014-05-08 5:17 ` Joonsoo Kim 2014-05-12 14:15 ` [PATCH] mm, compaction: properly signal and act upon lock and need_sched() contention Vlastimil Babka 2014-05-12 14:15 ` Vlastimil Babka 2014-05-12 15:34 ` Naoya Horiguchi [not found] ` <1399908847-ouuxeneo@n-horiguchi@ah.jp.nec.com> 2014-05-12 15:45 ` Vlastimil Babka 2014-05-12 15:45 ` Vlastimil Babka 2014-05-12 15:53 ` Naoya Horiguchi 2014-05-12 20:28 ` David Rientjes 2014-05-12 20:28 ` David Rientjes 2014-05-13 8:50 ` Vlastimil Babka 2014-05-13 8:50 ` Vlastimil Babka 2014-05-13 0:44 ` Joonsoo Kim 2014-05-13 0:44 ` Joonsoo Kim 2014-05-13 8:54 ` Vlastimil Babka 2014-05-13 8:54 ` Vlastimil Babka 2014-05-15 2:21 ` Joonsoo Kim 2014-05-15 2:21 ` Joonsoo Kim 2014-05-16 9:47 ` [PATCH v2] " Vlastimil Babka 2014-05-16 9:47 ` Vlastimil Babka 2014-05-16 17:33 ` Michal Nazarewicz 2014-05-16 17:33 ` Michal Nazarewicz 2014-05-19 23:37 ` Andrew Morton 2014-05-19 23:37 ` Andrew Morton 2014-05-21 14:13 ` Vlastimil Babka 2014-05-21 14:13 ` Vlastimil Babka 2014-05-21 20:11 ` Andrew Morton 2014-05-21 20:11 ` Andrew Morton 2014-05-22 3:20 ` compaction is still too expensive for thp (was: [PATCH v2] mm, compaction: properly signal and act upon lock and need_sched() contention) David Rientjes 2014-05-22 3:20 ` David Rientjes 2014-05-22 8:10 ` compaction is still too expensive for thp Vlastimil Babka 2014-05-22 8:10 ` Vlastimil Babka 2014-05-22 8:55 ` David Rientjes 2014-05-22 8:55 ` David Rientjes 2014-05-22 12:03 ` Vlastimil Babka 2014-05-22 12:03 ` Vlastimil Babka 2014-06-04 0:29 ` [patch -mm 1/3] mm: rename allocflags_to_migratetype for clarity David Rientjes 2014-06-04 0:29 ` David Rientjes 2014-06-04 0:29 ` [patch -mm 2/3] mm, compaction: pass gfp mask to compact_control David Rientjes 2014-06-04 0:29 ` David Rientjes 2014-06-04 0:30 ` [patch -mm 3/3] mm, compaction: avoid compacting memory for thp if pageblock cannot become free David Rientjes 2014-06-04 0:30 ` David Rientjes 2014-06-04 11:04 ` Mel Gorman 2014-06-04 11:04 ` Mel Gorman 2014-06-04 22:02 ` David Rientjes 2014-06-04 22:02 ` David Rientjes 2014-06-04 16:07 ` Vlastimil Babka 2014-06-04 16:07 ` Vlastimil Babka 2014-06-04 16:11 ` [RFC PATCH 1/6] mm, compaction: periodically drop lock and restore IRQs in scanners Vlastimil Babka 2014-06-04 16:11 ` Vlastimil Babka 2014-06-04 16:11 ` [RFC PATCH 2/6] mm, compaction: skip rechecks when lock was already held Vlastimil Babka 2014-06-04 16:11 ` Vlastimil Babka 2014-06-04 23:46 ` David Rientjes 2014-06-04 23:46 ` David Rientjes 2014-06-04 16:11 ` [RFC PATCH 3/6] mm, compaction: remember position within pageblock in free pages scanner Vlastimil Babka 2014-06-04 16:11 ` Vlastimil Babka 2014-06-04 16:11 ` [RFC PATCH 4/6] mm, compaction: skip buddy pages by their order in the migrate scanner Vlastimil Babka 2014-06-04 16:11 ` Vlastimil Babka 2014-06-05 0:02 ` David Rientjes 2014-06-05 0:02 ` David Rientjes 2014-06-05 9:24 ` Vlastimil Babka 2014-06-05 9:24 ` Vlastimil Babka 2014-06-05 21:30 ` David Rientjes 2014-06-05 21:30 ` David Rientjes 2014-06-06 7:20 ` Vlastimil Babka 2014-06-06 7:20 ` Vlastimil Babka 2014-06-09 9:09 ` David Rientjes 2014-06-09 9:09 ` David Rientjes 2014-06-09 11:35 ` Vlastimil Babka 2014-06-09 11:35 ` Vlastimil Babka 2014-06-09 22:25 ` David Rientjes 2014-06-09 22:25 ` David Rientjes 2014-06-10 7:26 ` Vlastimil Babka 2014-06-10 7:26 ` Vlastimil Babka 2014-06-10 23:54 ` David Rientjes 2014-06-10 23:54 ` David Rientjes 2014-06-11 12:18 ` Vlastimil Babka 2014-06-11 12:18 ` Vlastimil Babka 2014-06-12 0:21 ` David Rientjes 2014-06-12 0:21 ` David Rientjes 2014-06-12 11:56 ` Vlastimil Babka 2014-06-12 11:56 ` Vlastimil Babka 2014-06-12 21:48 ` David Rientjes 2014-06-12 21:48 ` David Rientjes 2014-06-04 16:11 ` [RFC PATCH 5/6] mm, compaction: try to capture the just-created high-order freepage Vlastimil Babka 2014-06-04 16:11 ` Vlastimil Babka 2014-06-04 16:11 ` [RFC PATCH 6/6] mm, compaction: don't migrate in blocks that cannot be fully compacted in async direct compaction Vlastimil Babka 2014-06-04 16:11 ` Vlastimil Babka 2014-06-05 0:08 ` David Rientjes 2014-06-05 0:08 ` David Rientjes 2014-06-05 15:38 ` Vlastimil Babka 2014-06-05 15:38 ` Vlastimil Babka 2014-06-05 21:38 ` David Rientjes 2014-06-05 21:38 ` David Rientjes 2014-06-06 7:33 ` Vlastimil Babka 2014-06-06 7:33 ` Vlastimil Babka 2014-06-09 9:06 ` David Rientjes 2014-06-09 9:06 ` David Rientjes 2014-06-12 12:18 ` Vlastimil Babka 2014-06-12 12:18 ` Vlastimil Babka 2014-06-04 23:39 ` [RFC PATCH 1/6] mm, compaction: periodically drop lock and restore IRQs in scanners David Rientjes 2014-06-04 23:39 ` David Rientjes 2014-06-05 9:05 ` Vlastimil Babka 2014-06-05 9:05 ` Vlastimil Babka 2014-05-22 23:49 ` [PATCH v2] mm, compaction: properly signal and act upon lock and need_sched() contention Kevin Hilman 2014-05-22 23:49 ` Kevin Hilman 2014-05-23 2:48 ` Shawn Guo 2014-05-23 2:48 ` Shawn Guo 2014-05-23 2:48 ` Shawn Guo 2014-05-23 8:34 ` Vlastimil Babka 2014-05-23 8:34 ` Vlastimil Babka 2014-05-23 8:34 ` Vlastimil Babka 2014-05-23 10:49 ` Shawn Guo 2014-05-23 10:49 ` Shawn Guo 2014-05-23 10:49 ` Shawn Guo 2014-05-23 15:07 ` Kevin Hilman 2014-05-23 15:07 ` Kevin Hilman 2014-05-23 15:07 ` Kevin Hilman 2014-05-30 16:59 ` Stephen Warren 2014-05-30 16:59 ` Stephen Warren 2014-05-30 16:59 ` Stephen Warren 2014-06-02 13:35 ` Fabio Estevam 2014-06-02 13:35 ` Fabio Estevam 2014-06-02 13:35 ` Fabio Estevam 2014-06-02 14:33 ` [PATCH -mm] mm, compaction: properly signal and act upon lock and need_sched() contention - fix Vlastimil Babka 2014-06-02 14:33 ` Vlastimil Babka 2014-06-02 14:33 ` Vlastimil Babka 2014-06-02 15:18 ` Fabio Estevam 2014-06-02 15:18 ` Fabio Estevam 2014-06-02 15:18 ` Fabio Estevam 2014-06-02 20:09 ` David Rientjes 2014-06-02 20:09 ` David Rientjes 2014-06-02 20:09 ` David Rientjes 2014-05-02 13:16 ` [patch 1/2] mm, migration: add destination page freeing callback Vlastimil Babka 2014-05-02 13:16 ` Vlastimil Babka
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