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khugepaged: ignore pmd tables with THP mapped with ptes 

Prepare khugepaged to see compound pages mapped with pte.  For now we
won't collapse the pmd table with such pte.

khugepaged is subject for future rework wrt new refcounting.

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>
Acked-by: 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>
hifive-unleashed-5.1
Kirill A. Shutemov 2016-01-15 16:52:39 -08:00 committed by Linus Torvalds
parent 7479df6da9
commit b1caa957ae
2 changed files with 9 additions and 1 deletions
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1
include/trace/events/huge_memory.h
View File

@ -22,6 +22,7 @@
EM( SCAN_PAGE_LRU, "page_not_in_lru") \
EM( SCAN_PAGE_LOCK, "page_locked") \
EM( SCAN_PAGE_ANON, "page_not_anon") \
EM( SCAN_PAGE_COMPOUND, "page_compound") \
EM( SCAN_ANY_PROCESS, "no_process_for_page") \
EM( SCAN_VMA_NULL, "vma_null") \
EM( SCAN_VMA_CHECK, "vma_check_failed") \

9
mm/huge_memory.c
View File

@ -45,6 +45,7 @@ enum scan_result {
SCAN_PAGE_LRU,
SCAN_PAGE_LOCK,
SCAN_PAGE_ANON,
SCAN_PAGE_COMPOUND,
SCAN_ANY_PROCESS,
SCAN_VMA_NULL,
SCAN_VMA_CHECK,
@ -2770,6 +2771,13 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
result = SCAN_PAGE_NULL;
goto out_unmap;
}
/* TODO: teach khugepaged to collapse THP mapped with pte */
if (PageCompound(page)) {
result = SCAN_PAGE_COMPOUND;
goto out_unmap;
}
/*
* Record which node the original page is from and save this
* information to khugepaged_node_load[].
@ -2782,7 +2790,6 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
goto out_unmap;
}
khugepaged_node_load[node]++;
VM_BUG_ON_PAGE(PageCompound(page), page);
if (!PageLRU(page)) {
result = SCAN_SCAN_ABORT;
goto out_unmap;