Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v10 7/8] hugetlb_cgroup: Add hugetlb_cgroup reservation
 tests
To:     Mina Almasry <almasrymina@google.com>
Cc:     mike.kravetz@oracle.com, rientjes@google.com, shakeelb@google.com,
        shuah@kernel.org, gthelen@google.com, akpm@linux-foundation.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org,
        aneesh.kumar@linux.vnet.ibm.com
References: <20200115012651.228058-1-almasrymina@google.com>
 <20200115012651.228058-7-almasrymina@google.com>
From:   Sandipan Das <sandipan@linux.ibm.com>
Date:   Thu, 23 Jan 2020 14:45:34 +0530
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.4.1
MIME-Version: 1.0
In-Reply-To: <20200115012651.228058-7-almasrymina@google.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Message-Id: <7ce6d59f-fd73-c529-2ad6-edda9937966d@linux.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi,

On 15/01/20 6:56 am, Mina Almasry wrote:
> The tests use both shared and private mapped hugetlb memory, and
> monitors the hugetlb usage counter as well as the hugetlb reservation
> counter. They test different configurations such as hugetlb memory usage
> via hugetlbfs, or MAP_HUGETLB, or shmget/shmat, and with and without
> MAP_POPULATE.
> 
> Also add test for hugetlb reservation reparenting, since this is
> a subtle issue.
> 
> Signed-off-by: Mina Almasry <almasrymina@google.com>
> 

For powerpc64, either 16MB/16GB or 2MB/1GB huge pages are supported depending
on the MMU type (Hash or Radix). I was just running these tests on a powerpc64
system with Hash MMU and ran into problems because the tests assume that the
hugepage size is always 2MB. Can you determine the huge page size at runtime?


- Sandipan