linux-kernel - Re: [PATCH 0/2] hugetlbfs: use i_mmap

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Date:   Thu, 12 Mar 2020 09:34:32 -0700 (PDT)
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Qian Cai <cai@....pw>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Michal Hocko <mhocko@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A.Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/2] hugetlbfs: use i_mmap_rwsem for more synchronization

On 3/12/20 8:57 AM, Qian Cai wrote:
> On Wed, 2020-03-04 at 16:26 -0800, Mike Kravetz wrote:
>> While discussing the issue with huge_pte_offset [1], I remembered that
>> there were more outstanding hugetlb races.  These issues are:
> 
> Reverted this series on the top of today's linux-next fixed the hang with LTP
> move_pages12 on both powerpc and arm64,
> 
> # /opt/ltp/testcases/bin/move_pages12
> tst_test.c:1217: INFO: Timeout per run is 0h 05m 00s
> move_pages12.c:263: INFO: Free RAM 260577280 kB
> move_pages12.c:281: INFO: Increasing 2048kB hugepages pool on node 0 to 4
> move_pages12.c:291: INFO: Increasing 2048kB hugepages pool on node 8 to 4
> move_pages12.c:207: INFO: Allocating and freeing 4 hugepages on node 0
> move_pages12.c:207: INFO: Allocating and freeing 4 hugepages on node 8
> <hang>

Thank you for finding this.
I'll dig into it.  It is timing related as it takes a few test runs for
me to reproduce.

Sorry for the issues.  Feel free to revert upstream and mm tree until
there is a resolution.
-- 
Mike Kravetz