From: Lokesh Gidra <lokeshgidra@google.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Kalesh Singh <kaleshsingh@google.com>,
Suren Baghdasaryan <surenb@google.com>,
Minchan Kim <minchan@google.com>,
Joel Fernandes <joelaf@google.com>,
kernel-team@android.com,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Shuah Khan <shuah@kernel.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Kees Cook <keescook@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
Sami Tolvanen <samitolvanen@google.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Frederic Weisbecker <frederic@kernel.org>,
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Masami Hiramatsu <mhiramat@kernel.org>,
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linux-kernel <linux-kernel@vger.kernel.org>,
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linux-kselftest@vger.kernel.org
Subject: Re: [PATCH 0/5] Speed up mremap on large regions
Date: Wed, 30 Sep 2020 15:42:17 -0700 [thread overview]
Message-ID: <CA+EESO5ABYANQuynOs57UGYMcOaMjKN9TQdv4T2PObY5ng_1nw@mail.gmail.com> (raw)
In-Reply-To: <20200930223207.5xepuvu6wr6xw5bb@black.fi.intel.com>
On Wed, Sep 30, 2020 at 3:32 PM Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> 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?
>
We have a Java garbage collector under development which requires
moving physical pages of multi-gigabyte heap using mremap. During this
move, the application threads have to be paused for correctness. It is
critical to keep this pause as short as possible to avoid jitters
during user interaction. This is where HAVE_MOVE_PUD will greatly
help.
> --
> Kirill A. Shutemov
next prev parent reply other threads:[~2020-09-30 22:42 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 22:21 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 ` [PATCH 0/5] Speed up mremap on large regions Kirill A. Shutemov
2020-09-30 22:42 ` Lokesh Gidra [this message]
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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