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

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Date:	Mon, 19 Mar 2012 12:31:36 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, 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 Mon, 19 Mar 2012 11:41:07 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> (2012/03/17 2:39), 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
> > 
> > Acked-by: Hillf Danton <dhillf@...il.com>
> > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> 
> 
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> A nitpick below.
> 
> > ---
> >  mm/hugetlb.c    |   21 ++++++++++++++++++++-
> >  mm/memcontrol.c |    5 +++++
> >  2 files changed, 25 insertions(+), 1 deletions(-)
> > 
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index c672187..91361a0 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -21,6 +21,8 @@
> >  #include <linux/rmap.h>
> >  #include <linux/swap.h>
> >  #include <linux/swapops.h>
> > +#include <linux/memcontrol.h>
> > +#include <linux/page_cgroup.h>
> >  
> >  #include <asm/page.h>
> >  #include <asm/pgtable.h>
> > @@ -542,6 +544,9 @@ static void free_huge_page(struct page *page)
> >  	BUG_ON(page_mapcount(page));
> >  	INIT_LIST_HEAD(&page->lru);
> >  
> > +	if (mapping)
> > +		mem_cgroup_hugetlb_uncharge_page(hstate_index(h),
> > +						 pages_per_huge_page(h), page);
> >  	spin_lock(&hugetlb_lock);
> >  	if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) {
> >  		update_and_free_page(h, page);
> > @@ -1019,12 +1024,15 @@ static void vma_commit_reservation(struct hstate *h,
> >  static struct page *alloc_huge_page(struct vm_area_struct *vma,
> >  				    unsigned long addr, int avoid_reserve)
> >  {
> > +	int ret, idx;
> >  	struct hstate *h = hstate_vma(vma);
> >  	struct page *page;
> > +	struct mem_cgroup *memcg = NULL;
> 
> 
> Can't we this initialization in mem_cgroup_hugetlb_charge_page() ?
> 

Will update in the next iteration.

-aneesh

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