linux-kernel - Re: [PATCH -V3 3/8] hugetlb: add charge/uncharge calls for HugeTLB alloc/free

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Message-ID: <87wr6n8ot7.fsf@linux.vnet.ibm.com>
Date:	Wed, 14 Mar 2012 15:52:28 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.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 -V3 3/8] hugetlb: add charge/uncharge calls for HugeTLB alloc/free

On Tue, 13 Mar 2012 21:20:21 +0800, Hillf Danton <dhillf@...il.com> wrote:
> On Tue, Mar 13, 2012 at 3:07 PM, Aneesh Kumar K.V
> <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> > From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> >
> > This adds necessary charge/uncharge calls in the HugeTLB code
> >
> > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> > ---
> >  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 fe7aefd..b7152d1 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(h - hstates,
> > +                                                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;
> >        struct address_space *mapping = vma->vm_file->f_mapping;
> >        struct inode *inode = mapping->host;
> >        long chg;
> >
> > +       idx = h - hstates;
> 
> Better if hstate index is computed with a tiny inline helper?
> Other than that,

Will update in the next iteration.

> 
> Acked-by: Hillf Danton <dhillf@...il.com>
> 

-aneesh

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