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-rw-r--r--mm/huge_memory.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b3cc9f2..f4da89c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -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;
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