From: Linus Torvalds <torvalds@linux-foundation.org>
To: kernel test robot <oliver.sang@intel.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
0day robot <lkp@intel.com>, LKML <linux-kernel@vger.kernel.org>,
lkp@lists.01.org, "Huang, Ying" <ying.huang@intel.com>,
Feng Tang <feng.tang@intel.com>,
Zhengjun Xing <zhengjun.xing@linux.intel.com>,
Linux-MM <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michael Ellerman <mpe@ellerman.id.au>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Kalesh Singh <kaleshsingh@google.com>,
Nick Piggin <npiggin@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
"Kirill A . Shutemov" <kirill@shutemov.name>
Subject: Re: [mm/mremap] ecf8443e51: vm-scalability.throughput -29.4% regression
Date: Mon, 14 Jun 2021 07:58:07 -0700 [thread overview]
Message-ID: <CAHk-=wg+TcJtrwEUzoht2j0R3+jw=OCqckptdf4Q9vNgCPSpXA@mail.gmail.com> (raw)
In-Reply-To: <20210614145536.GB28801@xsang-OptiPlex-9020>
On Mon, Jun 14, 2021 at 7:39 AM kernel test robot <oliver.sang@intel.com> wrote:
>
> FYI, we noticed a -29.4% regression of vm-scalability.throughput due to commit:
> ecf8443e51a8 ("[PATCH v7 02/11] mm/mremap: Fix race between MOVE_PUD mremap and pageout")
Ouch.
I guess it's not a huge surprise, but that's a fairly large regression.
Probably because the pud lock is just one single lock ("No scalability
reason to split PUD locks yet").
What happens if pud_lockptr() were to do the same thing that pmd_lockptr() does?
Linus
next prev parent reply other threads:[~2021-06-14 14:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 5:51 [PATCH v7 00/11] Speedup mremap on ppc64 Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 01/11] mm/mremap: Fix race between MOVE_PMD mremap and pageout Aneesh Kumar K.V
2021-06-08 0:06 ` Hugh Dickins
2021-06-08 7:52 ` Aneesh Kumar K.V
2021-06-08 9:42 ` Kirill A. Shutemov
2021-06-08 11:17 ` Aneesh Kumar K.V
2021-06-08 12:05 ` Kirill A. Shutemov
2021-06-08 20:39 ` Hugh Dickins
2021-06-07 5:51 ` [PATCH v7 02/11] mm/mremap: Fix race between MOVE_PUD " Aneesh Kumar K.V
2021-06-14 14:55 ` [mm/mremap] ecf8443e51: vm-scalability.throughput -29.4% regression kernel test robot
2021-06-14 14:58 ` Linus Torvalds [this message]
2021-06-14 16:08 ` Aneesh Kumar K.V
2021-06-17 2:38 ` [LKP] " Liu, Yujie
2021-06-07 5:51 ` [PATCH v7 03/11] selftest/mremap_test: Update the test to handle pagesize other than 4K Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 04/11] selftest/mremap_test: Avoid crash with static build Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 05/11] mm/mremap: Convert huge PUD move to separate helper Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 06/11] mm/mremap: Don't enable optimized PUD move if page table levels is 2 Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 07/11] mm/mremap: Use pmd/pud_poplulate to update page table entries Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 08/11] powerpc/mm/book3s64: Fix possible build error Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 09/11] mm/mremap: Allow arch runtime override Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 10/11] powerpc/book3s64/mm: Update flush_tlb_range to flush page walk cache Aneesh Kumar K.V
2021-06-07 5:51 ` [PATCH v7 11/11] powerpc/mm: Enable HAVE_MOVE_PMD support Aneesh Kumar K.V
2021-06-07 10:10 ` [PATCH v7 00/11] Speedup mremap on ppc64 Nick Piggin
2021-06-08 4:39 ` Aneesh Kumar K.V
2021-06-08 5:03 ` Nicholas Piggin
2021-06-08 17:10 ` Linus Torvalds
2021-06-16 1:44 ` Nicholas Piggin
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