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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-02-24 23:57:45 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-25 02:46:55 +0100
commitace71a19cec5eb430207c3269d8a2683f0574306 (patch)
treea4008d66fc253ba7a0b15c80f9df6306aa409ec3 /mm/huge_memory.c
parentuprobes: split THPs before trying to replace them (diff)
downloadlinux-ace71a19cec5eb430207c3269d8a2683f0574306.tar.xz
linux-ace71a19cec5eb430207c3269d8a2683f0574306.zip
mm: introduce page_vma_mapped_walk()
Introduce a new interface to check if a page is mapped into a vma. It aims to address shortcomings of page_check_address{,_transhuge}. Existing interface is not able to handle PTE-mapped THPs: it only finds the first PTE. The rest lefted unnoticed. page_vma_mapped_walk() iterates over all possible mapping of the page in the vma. Link: http://lkml.kernel.org/r/20170129173858.45174-3-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 85742ac5b32e..a7bac4f2b78a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2129,9 +2129,12 @@ static void freeze_page(struct page *page)
static void unfreeze_page(struct page *page)
{
int i;
-
- for (i = 0; i < HPAGE_PMD_NR; i++)
- remove_migration_ptes(page + i, page + i, true);
+ if (PageTransHuge(page)) {
+ remove_migration_ptes(page, page, true);
+ } else {
+ for (i = 0; i < HPAGE_PMD_NR; i++)
+ remove_migration_ptes(page + i, page + i, true);
+ }
}
static void __split_huge_page_tail(struct page *head, int tail,