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

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Message-ID: <20120330104650.GB15375@tiehlicka.suse.cz>
Date:	Fri, 30 Mar 2012 12:46:50 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
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

On Fri 30-03-12 16:10:00, Aneesh Kumar K.V wrote:
> 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 ?

Yes but we still migrate for memory failure (see soft_offline_page).

> check_range do check for is_vm_hugetlb_page.
> 
> -aneesh
> 

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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