linux-kernel - Re: [PATCH 3/9] mm, hugetlb: clean-up alloc_huge

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Date:	Tue, 23 Jul 2013 16:29:28 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	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
Subject: Re: [PATCH 3/9] mm, hugetlb: clean-up alloc_huge_page()

On Mon, Jul 22, 2013 at 04:51:50PM +0200, Michal Hocko wrote:
> On Mon 15-07-13 18:52:41, Joonsoo Kim wrote:
> > We can unify some codes for succeed allocation.
> > This makes code more readable.
> > There is no functional difference.
> 
> "This patch unifies successful allocation paths to make the code more
> readable. There are no functional changes."
> 
> Better?

Better :)

Thanks.

> 
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> Acked-by: Michal Hocko <mhocko@...e.cz>
> 
> > 
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index d21a33a..0067cf4 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -1144,29 +1144,25 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
> >  		hugepage_subpool_put_pages(spool, chg);
> >  		return ERR_PTR(-ENOSPC);
> >  	}
> > +
> >  	spin_lock(&hugetlb_lock);
> >  	page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);
> > -	if (page) {
> > -		/* update page cgroup details */
> > -		hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h),
> > -					     h_cg, page);
> > -		spin_unlock(&hugetlb_lock);
> > -	} else {
> > +	if (!page) {
> >  		spin_unlock(&hugetlb_lock);
> >  		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
> >  		if (!page) {
> >  			hugetlb_cgroup_uncharge_cgroup(idx,
> > -						       pages_per_huge_page(h),
> > -						       h_cg);
> > +						pages_per_huge_page(h), h_cg);
> >  			hugepage_subpool_put_pages(spool, chg);
> >  			return ERR_PTR(-ENOSPC);
> >  		}
> > +
> >  		spin_lock(&hugetlb_lock);
> > -		hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h),
> > -					     h_cg, page);
> >  		list_move(&page->lru, &h->hugepage_activelist);
> > -		spin_unlock(&hugetlb_lock);
> > +		/* Fall through */
> >  	}
> > +	hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page);
> > +	spin_unlock(&hugetlb_lock);
> >  
> >  	set_page_private(page, (unsigned long)spool);
> >  
> > -- 
> > 1.7.9.5
> > 
> 
> -- 
> Michal Hocko
> SUSE Labs
> 
> --
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