From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Kalesh Singh <kaleshsingh@google.com>
Cc: joelaf@google.com, Mark Rutland <mark.rutland@arm.com>,
Gavin Shan <gshan@redhat.com>, Brian Geffon <bgeffon@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Ram Pai <linuxram@us.ibm.com>,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
linux-mm@kvack.org,
William Kucharski <william.kucharski@oracle.com>,
Will Deacon <will@kernel.org>,
lokeshgidra@google.com, linux-kselftest@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>,
Christian Brauner <christian.brauner@ubuntu.com>,
Shuah Khan <shuah@kernel.org>,
Mina Almasry <almasrymina@google.com>, Jia He <justin.he@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Masahiro Yamada <masahiroy@kernel.org>,
x86@kernel.org, Krzysztof Kozlowski <krzk@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
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SeongJae Park <sjpark@amazon.de>,
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Andrew Morton <akpm@linux-foundation.org>,
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Sandipan Das <sandipan@linux.ibm.com>
Subject: Re: [PATCH 0/5] Speed up mremap on large regions
Date: Thu, 1 Oct 2020 01:32:07 +0300 [thread overview]
Message-ID: <20200930223207.5xepuvu6wr6xw5bb@black.fi.intel.com> (raw)
In-Reply-To: <20200930222130.4175584-1-kaleshsingh@google.com>
On Wed, Sep 30, 2020 at 10:21:17PM +0000, Kalesh Singh wrote:
> mremap time can be optimized by moving entries at the PMD/PUD level if
> the source and destination addresses are PMD/PUD-aligned and
> PMD/PUD-sized. Enable moving at the PMD and PUD levels on arm64 and
> x86. Other architectures where this type of move is supported and known to
> be safe can also opt-in to these optimizations by enabling HAVE_MOVE_PMD
> and HAVE_MOVE_PUD.
>
> Observed Performance Improvements for remapping a PUD-aligned 1GB-sized
> region on x86 and arm64:
>
> - HAVE_MOVE_PMD is already enabled on x86 : N/A
> - Enabling HAVE_MOVE_PUD on x86 : ~13x speed up
>
> - Enabling HAVE_MOVE_PMD on arm64 : ~ 8x speed up
> - Enabling HAVE_MOVE_PUD on arm64 : ~19x speed up
>
> Altogether, HAVE_MOVE_PMD and HAVE_MOVE_PUD
> give a total of ~150x speed up on arm64.
Is there a *real* workload that benefit from HAVE_MOVE_PUD?
--
Kirill A. Shutemov
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-09-30 22:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 22:21 [PATCH 0/5] Speed up mremap on large regions Kalesh Singh
2020-09-30 22:21 ` [PATCH 1/5] kselftests: vm: Add mremap tests Kalesh Singh
2020-10-01 7:24 ` John Hubbard
2020-10-01 15:46 ` Kalesh Singh
2020-10-01 18:36 ` John Hubbard
2020-09-30 22:21 ` [PATCH 2/5] arm64: mremap speedup - Enable HAVE_MOVE_PMD Kalesh Singh
2020-09-30 22:21 ` [PATCH 3/5] mm: Speedup mremap on 1GB or larger regions Kalesh Singh
2020-10-01 12:36 ` Kirill A. Shutemov
2020-10-01 16:40 ` Kalesh Singh
2020-10-01 18:10 ` Kalesh Singh
2020-09-30 22:21 ` [PATCH 4/5] arm64: mremap speedup - Enable HAVE_MOVE_PUD Kalesh Singh
2020-09-30 22:21 ` [PATCH 5/5] x86: " Kalesh Singh
2020-09-30 22:32 ` Kirill A. Shutemov [this message]
2020-09-30 22:42 ` [PATCH 0/5] Speed up mremap on large regions Lokesh Gidra
2020-09-30 22:46 ` Joel Fernandes
2020-09-30 23:03 ` Kalesh Singh
2020-10-01 12:27 ` Kirill A. Shutemov
2020-10-01 15:59 ` Kalesh Singh
2020-10-02 0:09 ` Lokesh Gidra
2020-10-02 5:35 ` Kirill A. Shutemov
2020-10-02 6:39 ` Lokesh Gidra
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