[PATCH 52 of 66] enable direct defrag

Andrea Arcangeli
2010-11-03T15:38:53Z

From: Andrea Arcangeli <aarcange@redhat.com>

With memory compaction in, and lumpy-reclaim removed, it seems safe enough to
defrag memory during the (synchronous) transparent hugepage page faults
(TRANSPARENT_HUGEPAGE_DEFRAG_FLAG) and not only during khugepaged (async)
hugepage allocations that was already enabled even before memory compaction was
in (TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG).

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -28,6 +28,7 @@
*/
unsigned long transparent_hugepage_flags __read_mostly =
(1<<TRANSPARENT_HUGEPAGE_FLAG)|
+ (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)|
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG);

/* default scan 8*512 pte (or vmas) every 30 second */