Re: [PATCH 3/9] mm, hugetlb: clean-up alloc_huge_page()

Michal Hocko
2013-07-22T14:51:52Z

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?

> 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