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Date: Tue, 13 Apr 2021 14:25:58 +0800
From: Kemeng Shi <shikemeng@...wei.com>
To: <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<x86@...nel.org>, <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
<shikemeng@...wei.com>
Subject: [PATCH] x86: Accelerate copy_page with non-temporal in X86
I'm using AEP with dax_kmem drvier, and AEP is export as a NUMA node in
my system. I will move cold pages from DRAM node to AEP node with
move_pages system call. With old "rep movsq', it costs 2030ms to move
1 GB pages. With "movnti", it only cost about 890ms to move 1GB pages.
I also test move 1GB pages from AEP node to DRAM node. But the result is
unexpected. "rep movesq" cost about 372 ms while "movnti" cost about
477ms. As said in X86 , "movnti" could avoid "polluting the caches" in
this situaction. I don't know if it's general result or just happening
in my machine. Hardware information is as follow:
CPU:
Intel(R) Xeon(R) Gold 6266C CPU @ 3.00GHz
DRAM:
Memory Device
Array Handle: 0x0035
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 64 GB
Form Factor: DIMM
Set: None
Locator: DIMM130 J40
Bank Locator: _Node1_Channel3_Dimm0
Type: DDR4
Type Detail: Synchronous Registered (Buffered)
Speed: 2933 MT/s
Manufacturer: Samsung
Serial Number: 03B71EB0
Asset Tag: 1950
Part Number: M393A8G40MB2-CVF
Rank: 2
Configured Memory Speed: 2666 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: DRAM
Memory Operating Mode Capability: Volatile memory
Firmware Version: 0000
Module Manufacturer ID: Bank 1, Hex 0xCE
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: 64 GB
Cache Size: None
Logical Size: None
AEP:
Memory Device
Array Handle: 0x0035
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 128 GB
Form Factor: DIMM
Set: None
Locator: DIMM131 J41
Bank Locator: _Node1_Channel3_Dimm1
Type: Logical non-volatile device
Type Detail: Synchronous Non-Volatile LRDIMM
Speed: 2666 MT/s
Manufacturer: Intel
Serial Number: 00006803
Asset Tag: 1949
Part Number: NMA1XXD128GPS
Rank: 1
Configured Memory Speed: 2666 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: Intel persistent memory
Memory Operating Mode Capability: Volatile memory
Byte-accessible persistent memory
Firmware Version: 5355
Module Manufacturer ID: Bank 1, Hex 0x89
Module Product ID: 0x0556
Memory Subsystem Controller Manufacturer ID: Bank 1, Hex 0x89
Memory Subsystem Controller Product ID: 0x097A
Non-Volatile Size: 126 GB
Volatile Size: None
Cache Size: None
Logical Size: None
Memory dimm topoloygy:
AEP
|
DRAM DRAM DRAM
| | |
|-------|-------|
CPU
|-------|-------|
| | |
DRAM DRAM DRAM
Signed-off-by: Kemeng Shi <shikemeng@...wei.com>
---
arch/x86/lib/copy_page_64.S | 73 ++++++++++++++++++++++++++++++++++++-
1 file changed, 72 insertions(+), 1 deletion(-)
diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S
index 2402d4c489d2..69389b4aeeed 100644
--- a/arch/x86/lib/copy_page_64.S
+++ b/arch/x86/lib/copy_page_64.S
@@ -14,7 +14,8 @@
*/
ALIGN
SYM_FUNC_START(copy_page)
- ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD
+ ALTERNATIVE_2 "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD, \
+ "jmp copy_page_nt", X86_FEATURE_XMM2
movl $4096/8, %ecx
rep movsq
ret
@@ -87,3 +88,73 @@ SYM_FUNC_START_LOCAL(copy_page_regs)
addq $2*8, %rsp
ret
SYM_FUNC_END(copy_page_regs)
+
+SYM_FUNC_START_LOCAL(copy_page_nt)
+ subq $2*8, %rsp
+ movq %rbx, (%rsp)
+ movq %r12, 1*8(%rsp)
+
+ movl $(4096/64)-5, %ecx
+ .p2align 4
+.LoopNT64:
+ decl %ecx
+
+ movq 0x8*0(%rsi), %rax
+ movq 0x8*1(%rsi), %rbx
+ movq 0x8*2(%rsi), %rdx
+ movq 0x8*3(%rsi), %r8
+ movq 0x8*4(%rsi), %r9
+ movq 0x8*5(%rsi), %r10
+ movq 0x8*6(%rsi), %r11
+ movq 0x8*7(%rsi), %r12
+
+ prefetcht0 5*64(%rsi)
+
+ movnti %rax, 0x8*0(%rdi)
+ movnti %rbx, 0x8*1(%rdi)
+ movnti %rdx, 0x8*2(%rdi)
+ movnti %r8, 0x8*3(%rdi)
+ movnti %r9, 0x8*4(%rdi)
+ movnti %r10, 0x8*5(%rdi)
+ movnti %r11, 0x8*6(%rdi)
+ movnti %r12, 0x8*7(%rdi)
+
+ leaq 64(%rdi), %rdi
+ leaq 64(%rsi), %rsi
+ jnz .LoopNT64
+
+ movl $5, %ecx
+ .p2align 4
+.LoopNT2:
+ decl %ecx
+
+ movq 0x8*0(%rsi), %rax
+ movq 0x8*1(%rsi), %rbx
+ movq 0x8*2(%rsi), %rdx
+ movq 0x8*3(%rsi), %r8
+ movq 0x8*4(%rsi), %r9
+ movq 0x8*5(%rsi), %r10
+ movq 0x8*6(%rsi), %r11
+ movq 0x8*7(%rsi), %r12
+
+ movnti %rax, 0x8*0(%rdi)
+ movnti %rbx, 0x8*1(%rdi)
+ movnti %rdx, 0x8*2(%rdi)
+ movnti %r8, 0x8*3(%rdi)
+ movnti %r9, 0x8*4(%rdi)
+ movnti %r10, 0x8*5(%rdi)
+ movnti %r11, 0x8*6(%rdi)
+ movnti %r12, 0x8*7(%rdi)
+
+ leaq 64(%rdi), %rdi
+ leaq 64(%rsi), %rsi
+ jnz .LoopNT2
+
+ movq (%rsp), %rbx
+ movq 1*8(%rsp), %r12
+ addq $2*8, %rsp
+
+ sfence
+
+ ret
+SYM_FUNC_END(copy_page_nt)
--
2.23.0
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