linux-kernel - Re: [PATCH v2 01/10] mm, hugetlb: move up the code which check availability of free huge page

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Date:	Mon, 22 Jul 2013 21:15:56 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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, Joonsoo Kim <js1304@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 01/10] mm, hugetlb: move up the code which check availability of free huge page

Joonsoo Kim <iamjoonsoo.kim@....com> writes:

> In this time we are holding a hugetlb_lock, so hstate values can't
> be changed. If we don't have any usable free huge page in this time,
> we don't need to proceede the processing. So move this code up.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>


>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index e2bfbf7..fc4988c 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
> @@ -556,6 +552,11 @@ retry_cpuset:
>  	if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
>  		goto err;
>
> +retry_cpuset:
> +	cpuset_mems_cookie = get_mems_allowed();
> +	zonelist = huge_zonelist(vma, address,
> +					htlb_alloc_mask, &mpol, &nodemask);
> +
>  	for_each_zone_zonelist_nodemask(zone, z, zonelist,
>  						MAX_NR_ZONES - 1, nodemask) {
>  		if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) {
> @@ -574,7 +575,6 @@ retry_cpuset:
>  	return page;
>
>  err:
> -	mpol_cond_put(mpol);
>  	return NULL;
>  }
>
> -- 
> 1.7.9.5

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