From: Kalesh Singh <kaleshsingh@google.com>
Cc: surenb@google.com, minchan@google.com, joelaf@google.com,
lokeshgidra@google.com, kaleshsingh@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>,
Masahiro Yamada <masahiroy@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Arnd Bergmann <arnd@arndb.de>,
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Zhenyu Ye <yezhenyu2@huawei.com>,
John Hubbard <jhubbard@nvidia.com>,
Sandipan Das <sandipan@linux.ibm.com>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Ram Pai <linuxram@us.ibm.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Dave Hansen <dave.hansen@intel.com>,
Mina Almasry <almasrymina@google.com>,
Brian Geffon <bgeffon@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Jason Gunthorpe <jgg@ziepe.ca>, SeongJae Park <sjpark@amazon.de>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org
Subject: [PATCH v3 0/5] Speed up mremap on large regions
Date: Mon, 5 Oct 2020 15:40:03 +0000 [thread overview]
Message-ID: <20201005154017.474722-1-kaleshsingh@google.com> (raw)
This version 3 of the mremap speed up patches previously posted at:
v1 - https://lore.kernel.org/r/20200930222130.4175584-1-kaleshsingh@google.com
v2 - https://lore.kernel.org/r/20201002162101.665549-1-kaleshsingh@google.com
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.
Changes in v2:
- Reduce mremap_test time by only validating a configurable
threshold of the remapped region, as per John.
- Use a random pattern for mremap validation. Provide pattern
seed in test output, as per John.
- Moved set_pud_at() to separate patch, per Kirill.
- Use switch() instead of ifs in move_pgt_entry(), per Kirill.
- Update commit message with description of Android
garbage collector use case for HAVE_MOVE_PUD, as per Joel.
- Fix build test error reported by kernel test robot in [1].
Changes in v3:
- Make lines 80 cols or less where they don’t need to be longer,
per John.
- Removed unused PATTERN_SIZE in mremap_test
- Added Reviewed-by tag for patch 1/5 (mremap kselftest patch).
- Use switch() instead of ifs in get_extent(), per Kirill
- Add BUILD_BUG() is get_extent() default case.
- Move get_old_pud() and alloc_new_pud() out of
#ifdef CONFIG_HAVE_MOVE_PUD, per Kirill.
- Have get_old_pmd() and alloc_new_pmd() use get_old_pud() and
alloc_old_pud(), per Kirill.
- Replace #ifdef CONFIG_HAVE_MOVE_PMD / PUD in move_page_tables()
with IS_ENABLED(CONFIG_HAVE_MOVE_PMD / PUD), per Kirill.
- Fold Add set_pud_at() patch into patch 4/5, per Kirill.
[1] https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/CKPGL4FH4NG7TGH2CVYX2UX76L25BTA3/
Kalesh Singh (5):
kselftests: vm: Add mremap tests
arm64: mremap speedup - Enable HAVE_MOVE_PMD
mm: Speedup mremap on 1GB or larger regions
arm64: mremap speedup - Enable HAVE_MOVE_PUD
x86: mremap speedup - Enable HAVE_MOVE_PUD
arch/Kconfig | 7 +
arch/arm64/Kconfig | 2 +
arch/arm64/include/asm/pgtable.h | 1 +
arch/x86/Kconfig | 1 +
mm/mremap.c | 230 ++++++++++++---
tools/testing/selftests/vm/.gitignore | 1 +
tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/mremap_test.c | 344 +++++++++++++++++++++++
tools/testing/selftests/vm/run_vmtests | 11 +
9 files changed, 558 insertions(+), 40 deletions(-)
create mode 100644 tools/testing/selftests/vm/mremap_test.c
base-commit: 549738f15da0e5a00275977623be199fbbf7df50
--
2.28.0.806.g8561365e88-goog
next reply other threads:[~2020-10-05 15:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-05 15:40 Kalesh Singh [this message]
2020-10-05 15:40 ` [PATCH v3 1/5] kselftests: vm: Add mremap tests Kalesh Singh
2020-10-05 15:40 ` [PATCH v3 2/5] arm64: mremap speedup - Enable HAVE_MOVE_PMD Kalesh Singh
2020-10-05 15:40 ` [PATCH v3 3/5] mm: Speedup mremap on 1GB or larger regions Kalesh Singh
2020-10-05 15:40 ` [PATCH v3 4/5] arm64: mremap speedup - Enable HAVE_MOVE_PUD Kalesh Singh
2020-10-05 15:40 ` [PATCH v3 5/5] x86: " Kalesh Singh
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