linux-kernel - Re: [PATCH v2 10/20] mm, hugetlb: remove resv_map

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Date:	Thu, 22 Aug 2013 16:24:51 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	David Gibson <david@...son.dropbear.id.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH v2 10/20] mm, hugetlb: remove resv_map_put()

On Wed, Aug 21, 2013 at 04:19:20PM +0530, Aneesh Kumar K.V wrote:
> Joonsoo Kim <iamjoonsoo.kim@....com> writes:
> 
> > In following patch, I change vma_resv_map() to return resv_map
> > for all case. This patch prepares it by removing resv_map_put() which
> > doesn't works properly with following change, because it works only for
> > HPAGE_RESV_OWNER's resv_map, not for all resv_maps.
> >
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> >
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index 73034dd..869c3e0 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -2212,15 +2212,6 @@ static void hugetlb_vm_op_open(struct vm_area_struct *vma)
> >  		kref_get(&resv->refs);
> >  }
> >
> > -static void resv_map_put(struct vm_area_struct *vma)
> > -{
> > -	struct resv_map *resv = vma_resv_map(vma);
> > -
> > -	if (!resv)
> > -		return;
> > -	kref_put(&resv->refs, resv_map_release);
> > -}
> 
> Why not have seperate functions to return vma_resv_map for
> HPAGE_RESV_OWNER and one for put ? That way we could have something like
> 
> resv_map_hpage_resv_owner_get()
> resv_map_hpge_resv_put() 

Because there is no place to call this function more than once.
IMO, in this simple case, open code is better to understand and better to
reduce code size.

> 
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Thanks :)
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