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

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Date:	Sat, 28 Feb 2015 09:25:07 -0800
From:	Mike Kravetz <mike.kravetz@...cle.com>
To:	Hillf Danton <hillf.zj@...baba-inc.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

On 02/27/2015 07:25 PM, Hillf Danton wrote:
>> @@ -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

Thanks Hillf.  I'll also take a look at other comments in the area
of 'accounting'.  As I discovered, it is only a matter of adjusting
the accounting to support reservation of pages for the entire filesystem.
-- 
Mike Kravetz

>> -	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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