default "4"
#
+# support for memory balloon compaction
+config BALLOON_COMPACTION
+ bool "Allow for balloon memory compaction/migration"
+ def_bool y
+ depends on COMPACTION && VIRTIO_BALLOON
+ help
+ Memory fragmentation introduced by ballooning might reduce
+ significantly the number of 2MB contiguous memory blocks that can be
+ used within a guest, thus imposing performance penalties associated
+ with the reduced number of transparent huge pages that could be used
+ by the guest workload. Allowing the compaction & migration for memory
+ pages enlisted as being part of memory balloon devices avoids the
+ scenario aforementioned and helps improving memory defragmentation.
+
+#
# support for memory compaction
config COMPACTION
bool "Allow for memory compaction"
+ def_bool y
select MIGRATION
depends on MMU
help
config TRANSPARENT_HUGEPAGE
bool "Transparent Hugepage Support"
- depends on X86 && MMU
+ depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
select COMPACTION
help
Transparent Hugepages allows the kernel to use huge pages and