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mm, numa: skip PTE-mapped THP on numa fault 

We're going to have THP mapped with PTEs.  It will confuse
numabalancing.  Let's skip them for now.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2016-01-15 16:53:49 -08:00 committed by Linus Torvalds
parent e1534ae950
commit e81c48024f
1 changed files with 6 additions and 0 deletions
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6
mm/memory.c
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@ -3193,6 +3193,12 @@ static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
return 0; return 0;
} }
/* TODO: handle PTE-mapped THP */
if (PageCompound(page)) {
pte_unmap_unlock(ptep, ptl);
return 0;
}
/* /*
* Avoid grouping on RO pages in general. RO pages shouldn't hurt as * Avoid grouping on RO pages in general. RO pages shouldn't hurt as
* much anyway since they can be in shared cache state. This misses * much anyway since they can be in shared cache state. This misses