linux-kernel - Re: [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting

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Date:	Sat, 28 Feb 2015 11:25:24 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Mike Kravetz'" <mike.kravetz@...cle.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, "Andrew Morton" <akpm@...ux-foundation.org>,
	<davidlohr@...com>,
	"'Aneesh Kumar'" <aneesh.kumar@...ux.vnet.ibm.com>,
	"'Joonsoo Kim'" <iamjoonsoo.kim@....com>
Subject: Re: [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting

> @@ -3444,10 +3445,14 @@ int hugetlb_reserve_pages(struct inode *inode,
>  	 * Check enough hugepages are available for the reservation.
>  	 * Hand the pages back to the subpool if there are not
>  	 */

Better if comment is updated correspondingly.
Hillf
> -	ret = hugetlb_acct_memory(h, chg);
> -	if (ret < 0) {
> -		hugepage_subpool_put_pages(spool, chg);
> -		goto out_err;
> +	if (subpool_reserved(spool))
> +		ret = 0;
> +	else {
> +		ret = hugetlb_acct_memory(h, chg);
> +		if (ret < 0) {
> +			hugepage_subpool_put_pages(spool, chg);
> +			goto out_err;
> +		}
>  	}
> 

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