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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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