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    Subject[PATCH V2 4/4] Frontswap (was Transcendent Memory): config files
    [PATCH V2 4/4] Frontswap (was Transcendent Memory): config files

    Frontswap config defaults to on as the hooks devolve to
    pointer-compare-to-NULL if no frontswap backend is provided.

    Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>

    Diffstat:
    Kconfig | 16 ++++++++++++++++
    Makefile | 1 +
    2 files changed, 17 insertions(+)

    --- linux-2.6.34/mm/Makefile 2010-05-16 15:17:36.000000000 -0600
    +++ linux-2.6.34-frontswap/mm/Makefile 2010-05-21 12:59:10.000000000 -0600
    @@ -17,6 +17,7 @@ obj-y += init-mm.o

    obj-$(CONFIG_BOUNCE) += bounce.o
    obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o
    +obj-$(CONFIG_FRONTSWAP) += frontswap.o
    obj-$(CONFIG_HAS_DMA) += dmapool.o
    obj-$(CONFIG_HUGETLBFS) += hugetlb.o
    obj-$(CONFIG_NUMA) += mempolicy.o
    --- linux-2.6.34/mm/Kconfig 2010-05-16 15:17:36.000000000 -0600
    +++ linux-2.6.34-frontswap/mm/Kconfig 2010-05-21 12:59:10.000000000 -0600
    @@ -287,3 +287,19 @@ config NOMMU_INITIAL_TRIM_EXCESS
    of 1 says that all excess pages should be trimmed.

    See Documentation/nommu-mmap.txt for more information.
    +
    +config FRONTSWAP
    + bool "Enable frontswap pseudo-RAM driver to cache swap pages"
    + default y
    + help
    + Frontswap is so named because it can be thought of as the opposite of
    + a "backing" store for a swap device. The storage is assumed to be
    + a synchronous concurrency-safe page-oriented pseudo-RAM device (such
    + as Xen's Transcendent Memory, aka "tmem") which is not directly
    + accessible or addressable by the kernel and is of unknown (and
    + possibly time-varying) size. When a pseudo-RAM device is available,
    + a signficant swap I/O reduction may be achieved. When none is
    + available, all frontswap calls are reduced to a single pointer-
    + compare-against-NULL resulting in a negligible performance hit.
    +
    + If unsure, say Y to enable frontswap.

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