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    SubjectRe: [PATCH RFC 2/2] mm, hugetlb: do not rely on overcommit limit during migration
    On Wed 29-11-17 10:22:34, Michal Hocko wrote:
    > What about this on top. I haven't tested this yet though.

    OK, it seem to work:
    root@test1:~# echo 1 > /proc/sys/vm/nr_hugepages
    root@test1:~# echo 1 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_overcommit_hugepages

    root@test1:~# grep . /sys/devices/system/node/node*/hugepages/hugepages-2048kB/*
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:0
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:0
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:1
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:1
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:0

    # mmap 2 huge pages

    root@test1:~# grep . /sys/devices/system/node/node*/hugepages/hugepages-2048kB/*
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:0
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:0
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:2
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:1

    root@test1:~# migratepages $(pidof map_hugetlb) 1 0

    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:0
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:2
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:1
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:0

    and exit the mmap

    root@test1:~# grep . /sys/devices/system/node/node*/hugepages/hugepages-2048kB/*
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:1
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:1
    /sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:0
    /sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:0
    --
    Michal Hocko
    SUSE Labs

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