From: Mike Kravetz <mike.kravetz@oracle.com>
To: kernel test robot <rong.a.chen@intel.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@kernel.org>, Hugh Dickins <hughd@google.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Prakash Sangappa <prakash.sangappa@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
stable@vger.kernel.org, lkp@01.org
Subject: Re: [LKP] [hugetlbfs] 9c83282117: vm-scalability.throughput -4.3% regression
Date: Wed, 2 Jan 2019 08:54:07 -0800 [thread overview]
Message-ID: <21117eab-862e-562b-0c86-ec2ccc1f68e4@oracle.com> (raw)
In-Reply-To: <20181228142608.GA17624@shao2-debian>
On 12/28/18 6:26 AM, kernel test robot wrote:
> Greeting,
>
> FYI, we noticed a -4.3% regression of vm-scalability.throughput due to commit:
>
>
> commit: 9c83282117778856d647ffc461c4aede2abb6742 ("[PATCH v3 1/2] hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization")
> url: https://github.com/0day-ci/linux/commits/Mike-Kravetz/hugetlbfs-use-i_mmap_rwsem-for-better-synchronization/20181223-095226
>
>
> in testcase: vm-scalability
> on test machine: 104 threads Intel(R) Xeon(R) Platinum 8170 CPU @ 2.10GHz with 64G memory
> with following parameters:
>
> runtime: 300s
> size: 8T
> test: anon-cow-seq-hugetlb
> cpufreq_governor: performance
> ucode: 0x200004d
I'll take a closer look.
The patch does introduce longer i_mmap_rwsem hold times for the sake of
correctness. Need to more fully understand the test and results to determine
if this is expected.
--
Mike Kravetz
next prev parent reply other threads:[~2019-01-02 16:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-22 22:30 [PATCH v3 0/2] hugetlbfs: use i_mmap_rwsem for better synchronization Mike Kravetz
2018-12-22 22:30 ` [PATCH v3 1/2] hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization Mike Kravetz
2018-12-28 14:26 ` [LKP] [hugetlbfs] 9c83282117: vm-scalability.throughput -4.3% regression kernel test robot
2018-12-28 14:26 ` kernel test robot
2019-01-02 16:54 ` Mike Kravetz [this message]
2018-12-22 22:30 ` [PATCH v3 2/2] hugetlbfs: Use i_mmap_rwsem to fix page fault/truncate race Mike Kravetz
2018-12-24 10:13 ` [PATCH v3 0/2] hugetlbfs: use i_mmap_rwsem for better synchronization Kirill A. Shutemov
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