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    SubjectRe: [RFC][PATCH 1/3] contigous big page allocator
    Date
    KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> writes:

    >> > My intention is not for allocating HUGEPAGE(> MAX_ORDER).
    >>
    >> I still believe using this for 1GB pages would be one of the more
    >> interesting use cases.
    >>
    >
    > I'm successfully allocating 1GB of continous pages at test. But I'm not sure
    > requirements and users. How quick this allocation should be ?

    This will always be slow. Huge pages are always pre allocated
    even today through a sysctl. The use case would be have

    echo XXX > /proc/sys/vm/nr_hugepages

    at runtime working for 1GB too, instead of requiring a reboot
    for this.

    I think it's ok if that is somewhat slow, as long as it is not
    incredible slow. Ideally it shouldn't cause a swap storm either

    (maybe we need some way to indicate how hard the freeing code should
    try?)

    I guess it would only really work well if you predefine
    movable zones at boot time.

    -Andi

    --
    ak@linux.intel.com -- Speaking for myself only.


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