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

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Message-ID: <20130716051020.GA30116@lge.com>
Date:	Tue, 16 Jul 2013 14:10:20 +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
Subject: Re: [PATCH 1/9] mm, hugetlb: move up the code which check
 availability of free huge page

On Tue, Jul 16, 2013 at 09:06:04AM +0530, Aneesh Kumar K.V wrote:
> Joonsoo Kim <iamjoonsoo.kim@....com> writes:
> 
> > On Mon, Jul 15, 2013 at 07:31:33PM +0530, Aneesh Kumar K.V wrote:
> >> Joonsoo Kim <iamjoonsoo.kim@....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@....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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