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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2013-07-02 11:15:15 +0530 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2013-07-02 10:08:22 +0200 |
| commit | f825c736e75b11adb59ec52a4a1096efddd2ec97 (patch) | |
| tree | 0592b3e3cf216341da2daa072874be0fc7d284d9 /mm/Kconfig | |
| parent | 8bb495e3f02401ee6f76d1b1d77f3ac9f079e376 (diff) | |
| download | linux-f825c736e75b11adb59ec52a4a1096efddd2ec97.tar.bz2 | |
mm/cma: Move dma contiguous changes into a seperate config
We want to use CMA for allocating hash page table and real mode area for
PPC64. Hence move DMA contiguous related changes into a seperate config
so that ppc64 can enable CMA without requiring DMA contiguous.
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[removed defconfig changes]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index e742d06285b7..26a5f815cfc3 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -477,3 +477,27 @@ config FRONTSWAP and swap data is stored as normal on the matching swap device. 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. |