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    Subject[PATCH -V1 0/9] hugetlbfs: Add cgroup resource controller for hugetlbfs

    This patchset implements a cgroup resource controller for HugeTLB pages.
    It is similar to the existing hugetlb quota support in that the limit is
    enforced at mmap(2) time and not at fault time. HugeTLB quota limit the
    number of huge pages that can allocated per superblock.

    For shared mapping we track the region mapped by a task along with the
    hugetlb cgroup. We keep the hugetlb cgroup charged even after the task
    that did mmap(2) exit. The uncharge happens during truncate. For Private
    mapping we charge and uncharge from the current task cgroup.

    A sample strace output for an application doing malloc with hugectl is given
    below. libhugetlbfs will fallback to normal pagesize if the HugeTLB mmap fails.

    open("/mnt/libhugetlbfs.tmp.uhLMgy", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
    unlink("/mnt/libhugetlbfs.tmp.uhLMgy") = 0


    mmap(0x20000000000, 50331648, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = -1 ENOMEM (Cannot allocate memory)
    write(2, "libhugetlbfs", 12libhugetlbfs) = 12
    write(2, ": WARNING: New heap segment map" ....
    mmap(NULL, 42008576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xfff946c0000

    Changes from RFC post:
    * Added support for HugeTLB cgroup hierarchy
    * Added support for task migration
    * Added documentation patch
    * Other Bug fixes


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      Last update: 2012-02-20 12:25    [W:0.019 / U:3.232 seconds]
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