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Commit ddb5cdbafaaad ("kbuild: generate KSYMTAB entries by modpost")
deprecated <asm/export.h>, which is now a wrapper of <linux/export.h>.
Replace #include <asm/export.h> with #include <linux/export.h>.
After all the <asm/export.h> lines are converted, <asm/export.h> and
<asm-generic/export.h> will be removed.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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This patch fixes an underflow issue in the return value within the
exception path, specifically at .Llt8 when the remaining length is less
than 8 bytes.
Cc: stable@vger.kernel.org
Fixes: 8941e93ca590 ("LoongArch: Optimize memory ops (memset/memcpy/memmove)")
Reported-by: Weihao Li <liweihao@loongson.cn>
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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To optimize memset()/memcpy()/memmove() and so on, we use a jump table
to dispatch cases for short data lengths; and for long data lengths, we
split the destination into head part (first 8 bytes), tail part (last 8
bytes) and middle part. The head part and tail part may be at unaligned
addresses, while the middle part is always aligned (the middle part is
allowed to overlap the head/tail part). In this way, the first and last
8 bytes may be unaligned accesses, but we can make sure the data in the
middle is processed at an aligned destination address.
We have tested micro-bench[1] on a Loongson-3C5000 16-core machine (2.2GHz):
1. memset
| length | src offset | dst offset | speed before | speed after | % |
|--------|------------|------------|--------------|-------------|---------|
| 8 | 0 | 0 | 696.191 | 1518.785 | 118.16% |
| 8 | 0 | 1 | 696.325 | 1518.937 | 118.14% |
| 50 | 0 | 0 | 969.976 | 8053.902 | 730.32% |
| 50 | 0 | 1 | 970.034 | 8058.475 | 730.74% |
| 300 | 0 | 0 | 5876.612 | 16544.703 | 181.53% |
| 300 | 0 | 1 | 5030.849 | 16549.011 | 228.95% |
| 1200 | 0 | 0 | 11797.077 | 16752.137 | 42.00% |
| 1200 | 0 | 1 | 5687.141 | 16645.233 | 192.68% |
| 4000 | 0 | 0 | 15723.27 | 16761.557 | 6.60% |
| 4000 | 0 | 1 | 5906.114 | 16732.316 | 183.30% |
| 8000 | 0 | 0 | 16751.403 | 16770.002 | 0.11% |
| 8000 | 0 | 1 | 5995.449 | 16754.07 | 179.45% |
2. memcpy
| length | src offset | dst offset | speed before | speed after | % |
|--------|------------|------------|--------------|-------------|---------|
| 8 | 0 | 0 | 696.2 | 1670.605 | 139.96% |
| 8 | 0 | 1 | 696.325 | 1671.138 | 139.99% |
| 50 | 0 | 0 | 969.974 | 8724.999 | 799.51% |
| 50 | 0 | 1 | 970.032 | 8730.138 | 799.98% |
| 300 | 0 | 0 | 5564.662 | 16272.652 | 192.43% |
| 300 | 0 | 1 | 4670.436 | 14972.842 | 220.59% |
| 1200 | 0 | 0 | 10740.23 | 16751.728 | 55.97% |
| 1200 | 0 | 1 | 5027.741 | 14874.564 | 195.85% |
| 4000 | 0 | 0 | 15122.367 | 16737.642 | 10.68% |
| 4000 | 0 | 1 | 5536.918 | 14890.397 | 168.93% |
| 8000 | 0 | 0 | 16505.453 | 16553.543 | 0.29% |
| 8000 | 0 | 1 | 5821.619 | 14841.804 | 154.94% |
3. memmove
| length | src offset | dst offset | speed before | speed after | % |
|--------|------------|------------|--------------|-------------|---------|
| 8 | 0 | 0 | 982.693 | 1670.568 | 70.00% |
| 8 | 0 | 1 | 983.023 | 1671.174 | 70.00% |
| 50 | 0 | 0 | 1230.87 | 8727.625 | 609.06% |
| 50 | 0 | 1 | 1232.515 | 8730.138 | 608.32% |
| 300 | 0 | 0 | 6490.375 | 16296.993 | 151.09% |
| 300 | 0 | 1 | 4282.687 | 14972.842 | 249.61% |
| 1200 | 0 | 0 | 11742.755 | 16752.546 | 42.66% |
| 1200 | 0 | 1 | 5039.338 | 14872.951 | 195.14% |
| 4000 | 0 | 0 | 15467.786 | 16737.09 | 8.21% |
| 4000 | 0 | 1 | 5009.905 | 14890.542 | 197.22% |
| 8000 | 0 | 0 | 16489.664 | 16553.273 | 0.39% |
| 8000 | 0 | 1 | 5823.786 | 14858.646 | 155.14% |
* speed: MB/s
* length: byte
[1] https://github.com/heiher/mem-bench
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Use the alternative to optimize common libraries according whether CPU
has UAL (hardware unaligned access support) feature, including memset(),
memcopy(), memmove(), copy_user() and clear_user().
We have tested UnixBench on a Loongson-3A5000 quad-core machine (1.6GHz):
1, One copy, before patch:
System Benchmarks Index Values BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 9566582.0 819.8
Double-Precision Whetstone 55.0 2805.3 510.1
Execl Throughput 43.0 2120.0 493.0
File Copy 1024 bufsize 2000 maxblocks 3960.0 209833.0 529.9
File Copy 256 bufsize 500 maxblocks 1655.0 89400.0 540.2
File Copy 4096 bufsize 8000 maxblocks 5800.0 320036.0 551.8
Pipe Throughput 12440.0 340624.0 273.8
Pipe-based Context Switching 4000.0 109939.1 274.8
Process Creation 126.0 4728.7 375.3
Shell Scripts (1 concurrent) 42.4 2223.1 524.3
Shell Scripts (8 concurrent) 6.0 883.1 1471.9
System Call Overhead 15000.0 518639.1 345.8
========
System Benchmarks Index Score 500.2
2, One copy, after patch:
System Benchmarks Index Values BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 9567674.7 819.9
Double-Precision Whetstone 55.0 2805.5 510.1
Execl Throughput 43.0 2392.7 556.4
File Copy 1024 bufsize 2000 maxblocks 3960.0 417804.0 1055.1
File Copy 256 bufsize 500 maxblocks 1655.0 112909.5 682.2
File Copy 4096 bufsize 8000 maxblocks 5800.0 1255207.4 2164.2
Pipe Throughput 12440.0 555712.0 446.7
Pipe-based Context Switching 4000.0 99964.5 249.9
Process Creation 126.0 5192.5 412.1
Shell Scripts (1 concurrent) 42.4 2302.4 543.0
Shell Scripts (8 concurrent) 6.0 919.6 1532.6
System Call Overhead 15000.0 511159.3 340.8
========
System Benchmarks Index Score 640.1
3, Four copies, before patch:
System Benchmarks Index Values BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 38268610.5 3279.2
Double-Precision Whetstone 55.0 11222.2 2040.4
Execl Throughput 43.0 7892.0 1835.3
File Copy 1024 bufsize 2000 maxblocks 3960.0 235149.6 593.8
File Copy 256 bufsize 500 maxblocks 1655.0 74959.6 452.9
File Copy 4096 bufsize 8000 maxblocks 5800.0 545048.5 939.7
Pipe Throughput 12440.0 1337359.0 1075.0
Pipe-based Context Switching 4000.0 473663.9 1184.2
Process Creation 126.0 17491.2 1388.2
Shell Scripts (1 concurrent) 42.4 6865.7 1619.3
Shell Scripts (8 concurrent) 6.0 1015.9 1693.1
System Call Overhead 15000.0 1899535.2 1266.4
========
System Benchmarks Index Score 1278.3
4, Four copies, after patch:
System Benchmarks Index Values BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 38272815.5 3279.6
Double-Precision Whetstone 55.0 11222.8 2040.5
Execl Throughput 43.0 8839.2 2055.6
File Copy 1024 bufsize 2000 maxblocks 3960.0 313912.9 792.7
File Copy 256 bufsize 500 maxblocks 1655.0 80976.1 489.3
File Copy 4096 bufsize 8000 maxblocks 5800.0 1176594.3 2028.6
Pipe Throughput 12440.0 2100941.9 1688.9
Pipe-based Context Switching 4000.0 476696.4 1191.7
Process Creation 126.0 18394.7 1459.9
Shell Scripts (1 concurrent) 42.4 7172.2 1691.6
Shell Scripts (8 concurrent) 6.0 1058.3 1763.9
System Call Overhead 15000.0 1874714.7 1249.8
========
System Benchmarks Index Score 1488.8
Signed-off-by: Jun Yi <yijun@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Use the `.L_xxx` label to improve fixup code and then remove the .fixup
section usage.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Consolidate all the __ex_table constuction code with a _ASM_EXTABLE or
_asm_extable helper.
There should be no functional change as a result of this patch.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Support for the syntactic sugar is present in upstream binutils port
from the beginning. Use it for shorter lines and better consistency.
Generated code should be identical.
Signed-off-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add some library functions for LoongArch, including: delay, memset,
memcpy, memmove, copy_user, strncpy_user, strnlen_user and tlb dump
functions.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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