Hello, On Tuesday, July 05, 2011 9:42 AM Marek Szyprowski wrote: > The Contiguous Memory Allocator is a set of helper functions for DMA > mapping framework that improves allocations of contiguous memory chunks. > > CMA grabs memory on system boot, marks it with CMA_MIGRATE_TYPE and > gives back to the system. Kernel is allowed to allocate movable pages > within CMA's managed memory so that it can be used for example for page > cache when DMA mapping do not use it. On dma_alloc_from_contiguous() > request such pages are migrated out of CMA area to free required > contiguous block and fulfill the request. This allows to allocate large > contiguous chunks of memory at any time assuming that there is enough > free memory available in the system. > > This code is heavily based on earlier works by Michal Nazarewicz. > > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > CC: Michal Nazarewicz <mina86@xxxxxxxxxx> > --- > drivers/base/Kconfig | 77 +++++++++ > drivers/base/Makefile | 1 + > drivers/base/dma-contiguous.c | 367 > ++++++++++++++++++++++++++++++++++++++++ > include/linux/dma-contiguous.h | 104 +++++++++++ > 4 files changed, 549 insertions(+), 0 deletions(-) > create mode 100644 drivers/base/dma-contiguous.c > create mode 100644 include/linux/dma-contiguous.h > > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig > index d57e8d0..95ae1a7 100644 > --- a/drivers/base/Kconfig > +++ b/drivers/base/Kconfig > @@ -168,4 +168,81 @@ config SYS_HYPERVISOR > bool > default n > > +config CMA > + bool "Contiguous Memory Allocator" > + depends HAVE_DMA_CONTIGUOUS && HAVE_MEMBLOCK The above line should be obviously "depends on HAVE_DMA_CONTIGUOUS && HAVE_MEMBLOCK". I'm sorry for posting broken version. (snipped) Best regards -- Marek Szyprowski Samsung Poland R&D Center -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
