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SubjectRe: [PATCH] mm/hugetlb_cgroup: Add list_del to remove unused page from hugepage_activelist when hugepage migration
On Wed, Jul 11, 2012 at 02:02:23PM +0530, Aneesh Kumar K.V wrote:
>Wanpeng Li <liwp.linux@gmail.com> writes:
>
>> From: Wanpeng Li <liwp@linux.vnet.ibm.com>
>>
>> hugepage_activelist is used to track currently used HugeTLB pages.
>> We can find the in-use HugeTLB pages to support HugeTLB cgroup
>> removal. Don't keep unused page in hugetlb_activelist too long.
>> Otherwise, on cgroup removal we should update the unused page's
>> charge to parent count. To reduce this overhead, remove unused page
>> from hugepage_activelist immediately.
>>
>> Signed-off-by: Wanpeng Li <liwp.linux@gmail.com>
>> ---
>> mm/hugetlb_cgroup.c | 1 +
>> 1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
>> index b834e8d..d819d66 100644
>> --- a/mm/hugetlb_cgroup.c
>> +++ b/mm/hugetlb_cgroup.c
>> @@ -398,6 +398,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
>> spin_lock(&hugetlb_lock);
>> h_cg = hugetlb_cgroup_from_page(oldhpage);
>> set_hugetlb_cgroup(oldhpage, NULL);
>> + list_del(&oldhpage->lru);
>>
>> /* move the h_cg details to new cgroup */
>> set_hugetlb_cgroup(newhpage, h_cg);
>
>put_page on the oldhpage will do that. If we do list_del here
>free_huge_page() will have error list_move().

I don't know if move the page to other lists when migration in order
to reduce overhead I mentioned make sense. :-)

Regards,
Wanpeng Li

>
>-aneesh


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