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    SubjectRe: [patch 7/7, v7] NUMA Hotplug Emulator: Implement mem_hotplug/add_memory debugfs interface
    On Thu, 2 Dec 2010, wrote:

    > From: Shaohui Zheng <>
    > Add mem_hotplug/add_memory interface to support to memory hotplug emulation.
    > the reserved memory can be added into desired node with this interface.
    > Add a memory section(128M) to node 3(boots with mem=1024m)
    > echo 0x40000000,3 > mem_hotplug/add_memory
    > And more we make it friendly, it is possible to add memory to do
    > echo 3g > mem_hotplug/add_memory
    > echo 1024m,3 > mem_hotplug/add_memory
    > Another format suggested by Dave Hansen:
    > echo physical_address=0x40000000 numa_node=3 > mem_hotplug/add_memory
    > it is more explicit to show meaning of the parameters.

    NACK, we don't need such convoluted definitions if debugfs were extended
    with per-node triggers to add_memory as I suggested in v6 of your

    /sys/kernel/debug/mem_hotplug/add_node (already exists)

    You can then write a physical starting address to the add_memory files to
    hotadd memory to a node other than the one to which it has physical
    affinity. This is much more extendable if we add additional per-node
    triggers later.

    It would also be helpful if you were to reach consensus on the matters
    under discussion before posting a new version of your patchset everyday.

     \ /
      Last update: 2010-12-03 00:39    [W:0.023 / U:0.592 seconds]
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