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    SubjectRe: [PATCH -V8 10/16] hugetlb/cgroup: Add the cgroup pointer to page lru
    (2012/06/09 17:59), Aneesh Kumar K.V wrote:
    > From: "Aneesh Kumar K.V"<aneesh.kumar@linux.vnet.ibm.com>
    >
    > Add the hugetlb cgroup pointer to 3rd page lru.next. This limit
    > the usage to hugetlb cgroup to only hugepages with 3 or more
    > normal pages. I guess that is an acceptable limitation.
    >
    > Signed-off-by: Aneesh Kumar K.V<aneesh.kumar@linux.vnet.ibm.com>
    > ---
    > include/linux/hugetlb_cgroup.h | 31 +++++++++++++++++++++++++++++++
    > mm/hugetlb.c | 4 ++++
    > 2 files changed, 35 insertions(+)
    >
    > diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
    > index 5794be4..ceff1d5 100644
    > --- a/include/linux/hugetlb_cgroup.h
    > +++ b/include/linux/hugetlb_cgroup.h
    > @@ -26,6 +26,26 @@ struct hugetlb_cgroup {
    > };
    >
    > #ifdef CONFIG_CGROUP_HUGETLB_RES_CTLR
    > +static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
    > +{
    > + if (!PageHuge(page))
    > + return NULL;

    I'm not very sure but....

    VM_BUG_ON(!PageHuge(page)) ??



    > + if (compound_order(page)< 3)
    > + return NULL;
    > + return (struct hugetlb_cgroup *)page[2].lru.next;
    > +}
    > +
    > +static inline
    > +int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
    > +{
    > + if (!PageHuge(page))
    > + return -1;

    ditto.

    > + if (compound_order(page)< 3)
    > + return -1;
    > + page[2].lru.next = (void *)h_cg;
    > + return 0;
    > +}
    > +

    Thanks,
    -Kame



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