Subject: Re: [bug/regression] libhugetlbfs testsuite failures and OOMs
 eventually kill my system
To: Jan Stancek <jstancek@redhat.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
References: <57FF7BB4.1070202@redhat.com>
 <277142fc-330d-76c7-1f03-a1c8ac0cf336@oracle.com>
Cc: hillf.zj@alibaba-inc.com, dave.hansen@linux.intel.com,
        kirill.shutemov@linux.intel.com, mhocko@suse.cz,
        n-horiguchi@ah.jp.nec.com, aneesh.kumar@linux.vnet.ibm.com,
        iamjoonsoo.kim@lge.com
From: Mike Kravetz <mike.kravetz@oracle.com>
Message-ID: <efa8b5c9-0138-69f9-0399-5580a086729d@oracle.com>
Date: Thu, 13 Oct 2016 16:26:36 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
 Thunderbird/45.3.0
MIME-Version: 1.0
In-Reply-To: <277142fc-330d-76c7-1f03-a1c8ac0cf336@oracle.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 989
Lines: 34

On 10/13/2016 08:24 AM, Mike Kravetz wrote:
> On 10/13/2016 05:19 AM, Jan Stancek wrote:
>> Hi,
>>
>> I'm running into ENOMEM failures with libhugetlbfs testsuite [1] on
>> a power8 lpar system running 4.8 or latest git [2]. Repeated runs of
>> this suite trigger multiple OOMs, that eventually kill entire system,
>> it usually takes 3-5 runs:
>>
>>  * Total System Memory......:  18024 MB
>>  * Shared Mem Max Mapping...:    320 MB
>>  * System Huge Page Size....:     16 MB
>>  * Available Huge Pages.....:     20
>>  * Total size of Huge Pages.:    320 MB
>>  * Remaining System Memory..:  17704 MB
>>  * Huge Page User Group.....:  hugepages (1001)
>>

Hi Jan,

Any chance you can get the contents of /sys/kernel/mm/hugepages
before and after the first run of libhugetlbfs testsuite on Power?
Perhaps a script like:

cd /sys/kernel/mm/hugepages
for f in hugepages-*/*; do
	n=`cat $f`;
	echo -e "$n\t$f";
done

Just want to make sure the numbers look as they should.

-- 
Mike Kravetz