From: zi.yan@sent.com
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: benh@kernel.crashing.org, mgorman@techsingularity.net,
kirill.shutemov@linux.intel.com, akpm@linux-foundation.org,
dave.hansen@linux.intel.com, n-horiguchi@ah.jp.nec.com
Subject: [PATCH v1 04/12] mm: thp: enable thp migration in generic path
Date: Mon, 26 Sep 2016 11:22:26 -0400 [thread overview]
Message-ID: <20160926152234.14809-5-zi.yan@sent.com> (raw)
In-Reply-To: <20160926152234.14809-1-zi.yan@sent.com>
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
This patch makes it possible to support thp migration gradually. If you fail
to allocate a destination page as a thp, you just split the source thp as we
do now, and then enter the normal page migration. If you succeed to allocate
destination thp, you enter thp migration. Subsequent patches actually enable
thp migration for each caller of page migration by allowing its get_new_page()
callback to allocate thps.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
mm/migrate.c | 2 +-
mm/rmap.c | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 95613e7..dfca530 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1123,7 +1123,7 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page,
goto out;
}
- if (unlikely(PageTransHuge(page))) {
+ if (unlikely(PageTransHuge(page) && !PageTransHuge(newpage))) {
lock_page(page);
rc = split_huge_page(page);
unlock_page(page);
diff --git a/mm/rmap.c b/mm/rmap.c
index 1ef3640..d53fff5 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1443,6 +1443,11 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
struct rmap_private *rp = arg;
enum ttu_flags flags = rp->flags;
+ if (!PageHuge(page) && PageTransHuge(page)) {
+ VM_BUG_ON_PAGE(!(flags & TTU_MIGRATION), page);
+ return set_pmd_migration_entry(page, mm, address);
+ }
+
/* munlock has nothing to gain from examining un-locked vmas */
if ((flags & TTU_MUNLOCK) && !(vma->vm_flags & VM_LOCKED))
goto out;
--
2.9.3
--
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next prev parent reply other threads:[~2016-09-26 15:24 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-26 15:22 [PATCH v1 00/12] mm: THP migration support zi.yan
2016-09-26 15:22 ` [PATCH v1 01/12] mm: mempolicy: add queue_pages_node_check() zi.yan
2016-09-26 15:22 ` [PATCH v1 02/12] mm: thp: introduce CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION zi.yan
2016-09-26 15:22 ` [PATCH v1 03/12] mm: thp: add helpers related to thp/pmd migration zi.yan
2016-09-26 15:22 ` zi.yan [this message]
2016-09-26 15:22 ` [PATCH v1 05/12] mm: thp: check pmd migration entry in common path zi.yan
2016-09-26 15:22 ` [PATCH v1 06/12] mm: soft-dirty: keep soft-dirty bits over thp migration zi.yan
2016-09-26 15:22 ` [PATCH v1 07/12] mm: hwpoison: fix race between unpoisoning and freeing migrate source page zi.yan
2016-09-26 15:22 ` [PATCH v1 08/12] mm: hwpoison: soft offline supports thp migration zi.yan
2016-09-26 15:22 ` [PATCH v1 09/12] mm: mempolicy: mbind and migrate_pages support " zi.yan
2016-09-26 15:22 ` [PATCH v1 10/12] mm: migrate: move_pages() supports " zi.yan
2016-09-26 15:22 ` [PATCH v1 11/12] mm: memory_hotplug: memory hotremove " zi.yan
2016-09-26 15:22 ` [PATCH v1 12/12] mm: ppc64: Add THP migration support for ppc64 zi.yan
2016-09-30 0:02 ` Balbir Singh
2016-09-30 5:18 ` Aneesh Kumar K.V
2016-09-26 15:38 ` [PATCH v1 00/12] THP migration support Zi Yan
2016-09-29 8:25 ` Naoya Horiguchi
2016-09-30 2:32 ` Zi Yan
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