linux-kernel - Re: [PATCH v10 7/8] hugetlb_cgroup: Add hugetlb

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Date:   Thu, 23 Jan 2020 14:45:34 +0530
From:   Sandipan Das <sandipan@...ux.ibm.com>
To:     Mina Almasry <almasrymina@...gle.com>
Cc:     mike.kravetz@...cle.com, rientjes@...gle.com, shakeelb@...gle.com,
        shuah@...nel.org, gthelen@...gle.com, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, cgroups@...r.kernel.org,
        aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [PATCH v10 7/8] hugetlb_cgroup: Add hugetlb_cgroup reservation
 tests

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@...gle.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