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

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Date:   Mon, 3 Feb 2020 15:18:55 -0800
From:   Mina Almasry <almasrymina@...gle.com>
To:     Sandipan Das <sandipan@...ux.ibm.com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Shakeel Butt <shakeelb@...gle.com>, shuah <shuah@...nel.org>,
        Greg Thelen <gthelen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, cgroups@...r.kernel.org,
        Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v10 7/8] hugetlb_cgroup: Add hugetlb_cgroup reservation tests

On Wed, Jan 29, 2020 at 10:11 PM Sandipan Das <sandipan@...ux.ibm.com> wrote:
>
> 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, I updated the tests to not assume 2MB page size, but I'm
having trouble getting a setup with a non-2MB default size to test
with. I'm uploading v11 of the series shortly, please let me know if
the problem persists.

> - Sandipan
>