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    SubjectRe: [PATCH -V8 15/16] hugetlb/cgroup: migrate hugetlb cgroup info from oldpage to new page during migration
    Date
    Michal Hocko <mhocko@suse.cz> writes:

    > On Sat 09-06-12 14:30:00, Aneesh Kumar K.V wrote:
    >> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
    >>
    >> With HugeTLB pages, hugetlb cgroup is uncharged in compound page
    >> destructor. Since we are holding a hugepage reference,
    >
    > Who is holding that reference? I do not see anybody calling get_page in
    > this patch...
    >

    soft_offline_huge_page takes the reference. It does the final
    put_page(hpage) there.

    >> we can be sure that old page won't get uncharged till the last
    >> put_page().
    >>

    -aneesh



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