Re: [PATCH -V4 05/10] hugetlb: add charge/uncharge calls for HugeTLB alloc/free
From: Aneesh Kumar K.V
Date: Fri Mar 30 2012 - 06:55:50 EST
Michal Hocko <mhocko@xxxxxxx> writes:
> On Wed 28-03-12 23:09:34, Aneesh Kumar K.V wrote:
>> Michal Hocko <mhocko@xxxxxxx> writes:
>> > On Fri 16-03-12 23:09:25, Aneesh Kumar K.V wrote:
>> >> From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
>> >> This adds necessary charge/uncharge calls in the HugeTLB code
>> > This begs for more description...
>> > Other than that it looks correct.
>> Updated as below
>> hugetlb: add charge/uncharge calls for HugeTLB alloc/free
>> This adds necessary charge/uncharge calls in the HugeTLB code. We do
>> memcg charge in page alloc and uncharge in compound page destructor.
>> We also need to ignore HugeTLB pages in __mem_cgroup_uncharge_common
>> because that get called from delete_from_page_cache
> and from mem_cgroup_end_migration used during soft_offline_page.
> Btw., while looking at mem_cgroup_end_migration, I have noticed that you
> need to take care of mem_cgroup_prepare_migration as well otherwise the
> page would get charged as a normal (shmem) page.
Won't we skip HugeTLB pages in migrate ? check_range do check for
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