Re: [PATCH 1/9] mm, hugetlb: move up the code which check availability of free huge page

Joonsoo Kim
2013-07-16T05:10:22Z

On Tue, Jul 16, 2013 at 09:06:04AM +0530, Aneesh Kumar K.V wrote:
> Joonsoo Kim <iamjoonsoo.kim@lge.com> writes:
>
> > On Mon, Jul 15, 2013 at 07:31:33PM +0530, Aneesh Kumar K.V wrote:
> >> Joonsoo Kim <iamjoonsoo.kim@lge.com> writes:
> >>
> >> > We don't need to proceede the processing if we don't have any usable
> >> > free huge page. So move this code up.
> >>
> >> I guess you can also mention that since we are holding hugetlb_lock
> >> hstate values can't change.
> >
> > Okay. I will mention this for v2.
> >
> >>
> >>
> >> Also.
> >>
> >> >
> >> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> >> >
> >> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> >> > index e2bfbf7..d87f70b 100644
> >> > --- a/mm/hugetlb.c
> >> > +++ b/mm/hugetlb.c
> >> > @@ -539,10 +539,6 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
> >> > struct zoneref *z;
> >> > unsigned int cpuset_mems_cookie;
> >> >
> >> > -retry_cpuset:
> >> > - cpuset_mems_cookie = get_mems_allowed();
> >> > - zonelist = huge_zonelist(vma, address,
> >> > - htlb_alloc_mask, &mpol, &nodemask);
> >> > /*
> >> > * A child process with MAP_PRIVATE mappings created by their parent
> >> > * have no page reserves. This check ensures that reservations are
> >> > @@ -550,11 +546,16 @@ retry_cpuset:
> >> > */
> >> > if (!vma_has_reserves(vma) &&
> >> > h->free_huge_pages - h->resv_huge_pages == 0)
> >> > - goto err;
> >> > + return NULL;
> >> >
> >>
> >> If you don't do the above change, the patch will be much simpler.
> >
> > The patch will be, but output code will not.
> > With this change, we can remove one goto label('err:') and
> > this makes code more readable.
> >
>
> If you feel stronly about the cleanup, you can do another path for the
> cleanups. Don't mix things in a single patch. That makes review difficult.

Okay! I will make an another patch for clean-up.

Thanks.

>
> -aneesh
>
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