linux-kernel - Re: [PATCH -V4 05/10] hugetlb: add charge/uncharge calls for HugeTLB alloc/free

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Message-ID: <871uoamkxr.fsf@skywalker.in.ibm.com>
Date:	Fri, 30 Mar 2012 16:10:00 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, akpm@...ux-foundation.org, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V4 05/10] hugetlb: add charge/uncharge calls for HugeTLB alloc/free

Michal Hocko <mhocko@...e.cz> writes:

> On Wed 28-03-12 23:09:34, Aneesh Kumar K.V wrote:
>> Michal Hocko <mhocko@...e.cz> writes:
>> 
>> > On Fri 16-03-12 23:09:25, Aneesh Kumar K.V wrote:
>> >> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
>> >> 
>> >> 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
is_vm_hugetlb_page.

-aneesh

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