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    SubjectRe: [Linaro-mm-sig] [PATCHv23 13/16] drivers: add Contiguous Memory Allocator
    2012/2/23 Marek Szyprowski <>:
    > 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 MIGRATE_CMA migrate type
    > and gives back to the system. Kernel is allowed to allocate only 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 <>
    > Signed-off-by: Kyungmin Park <>
    > Signed-off-by: Michal Nazarewicz <>
    > Acked-by: Arnd Bergmann <>
    > Tested-by: Rob Clark <>
    > Tested-by: Ohad Ben-Cohen <>
    > Tested-by: Benjamin Gaignard <>
    > Tested-by: Robert Nelson <>

    if there is a /proc/cmainfo like /proc/slabinfo, it might be helpful
    to people as we can see the usage of CMA clearly.


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