On Tuesday 05 July 2011, 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> Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>, but I noticed two one-character mistakes: > +if CMA > + > +config CMA_DEBUG > + bool "CMA debug messages (DEVELOPEMENT)" s/DEVELOPEMENT/DEVELOPMENT/ > diff --git a/drivers/base/Makefile b/drivers/base/Makefile > index 4c5701c..be6aab4 100644 > --- a/drivers/base/Makefile > +++ b/drivers/base/Makefile > @@ -5,6 +5,7 @@ obj-y := core.o sys.o bus.o dd.o syscore.o \ > cpu.o firmware.o init.o map.o devres.o \ > attribute_container.o transport_class.o > obj-$(CONFIG_DEVTMPFS) += devtmpfs.o > +obj-$(CONFIG_CMA) += dma-contiguous.o > obj-y += power/ > obj-$(CONFIG_HAS_DMA) += dma-mapping.o Please add another tab to indent the line in the same way as the others. Arnd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>