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>,
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"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
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SeongJae Park <sjpark@amazon.de>,
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linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org
Subject: [PATCH v3 5/5] x86: mremap speedup - Enable HAVE_MOVE_PUD
Date: Mon, 5 Oct 2020 15:40:08 +0000 [thread overview]
Message-ID: <20201005154017.474722-6-kaleshsingh@google.com> (raw)
In-Reply-To: <20201005154017.474722-1-kaleshsingh@google.com>
HAVE_MOVE_PUD enables remapping pages at the PUD level if both the
source and destination addresses are PUD-aligned.
With HAVE_MOVE_PUD enabled it can be inferred that there is approximately
a 13x improvement in performance on x86. (See data below).
------- Test Results ---------
The following results were obtained using a 5.4 kernel, by remapping
a PUD-aligned, 1GB sized region to a PUD-aligned destination.
The results from 10 iterations of the test are given below:
Total mremap times for 1GB data on x86. All times are in nanoseconds.
Control HAVE_MOVE_PUD
180394 15089
235728 14056
238931 25741
187330 13838
241742 14187
177925 14778
182758 14728
160872 14418
205813 15107
245722 13998
205721.5 15594 <-- Mean time in nanoseconds
A 1GB mremap completion time drops from ~205 microseconds
to ~15 microseconds on x86. (~13x speed up).
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
---
arch/x86/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7101ac64bb20..ff6e2755cab8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -198,6 +198,7 @@ config X86
select HAVE_MIXED_BREAKPOINTS_REGS
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_MOVE_PMD
+ select HAVE_MOVE_PUD
select HAVE_NMI
select HAVE_OPROFILE
select HAVE_OPTPROBES
--
2.28.0.806.g8561365e88-goog
prev parent reply other threads:[~2020-10-05 15:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-05 15:40 [PATCH v3 0/5] Speed up mremap on large regions Kalesh Singh
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 ` Kalesh Singh [this message]
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