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

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Date:   Thu, 30 Jan 2020 11:41:15 +0530
From:   Sandipan Das <sandipan@...ux.ibm.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Mina Almasry <almasrymina@...gle.com>, mike.kravetz@...cle.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 David,

On 30/01/20 2:30 am, David Rientjes wrote:
> On Thu, 23 Jan 2020, Sandipan Das wrote:
> 
>> 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?
>>
> 
> I assume this is only testing failures of the tools/testing/selftests 
> additions that hardcode 2MB paths and not a kernel problem?  In other 
> words, you can still boot, reserve, alloc, and free hugetlb pages on ppc 
> after this patchset without using the selftests?
> 

Yes, its just the hardcoded paths. I didn't run into any kernel problems.

- Sandipan