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-rw-r--r--mm/Kconfig24
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 8028dcc6615c..6cdd27043303 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -478,6 +478,30 @@ config FRONTSWAP
If unsure, say Y to enable frontswap.
+config CMA
+ bool "Contiguous Memory Allocator"
+ depends on HAVE_MEMBLOCK
+ select MIGRATION
+ select MEMORY_ISOLATION
+ help
+ This enables the Contiguous Memory Allocator which allows other
+ subsystems to allocate big physically-contiguous blocks of memory.
+ CMA reserves a region of memory and allows only movable pages to
+ be allocated from it. This way, the kernel can use the memory for
+ pagecache and when a subsystem requests for contiguous area, the
+ allocated pages are migrated away to serve the contiguous request.
+
+ If unsure, say "n".
+
+config CMA_DEBUG
+ bool "CMA debug messages (DEVELOPMENT)"
+ depends on DEBUG_KERNEL && CMA
+ help
+ Turns on debug messages in CMA. This produces KERN_DEBUG
+ messages for every CMA call as well as various messages while
+ processing calls such as dma_alloc_from_contiguous().
+ This option does not affect warning and error messages.
+
config ZBUD
tristate
default n