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SubjectRe: [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@lge.com>
>
> Acked-by: Michal Hocko <mhocko@suse.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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