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Loongson-3A3000: Abnormal memory(VmRSS) usage on mips64 #43091

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orcNo opened this issue Dec 9, 2020 · 8 comments
Closed

Loongson-3A3000: Abnormal memory(VmRSS) usage on mips64 #43091

orcNo opened this issue Dec 9, 2020 · 8 comments
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@orcNo
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orcNo commented Dec 9, 2020

What version of Go are you using (go version)?

$ go version
go version go1.15.5 linux/mips64le

Does this issue reproduce with the latest release?

no

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE="off"
GOARCH="mips64le"
GOBIN="/home/mips/gopath/go/bin/"
GOCACHE="/home/mips/.cache/go-build"
GOENV="/home/mips/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="mips64le"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/mips/gopath/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/mips/gopath/go:/usr/share/gocode/:/home/mips/gopath/dde-go"
GOPRIVATE=""
GOPROXY="https://goproxy.io,direct"
GOROOT="/usr/lib/go-1.15"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.15/pkg/tool/linux_mips64le"
GCCGO="gccgo"
GOMIPS64="hardfloat"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -mabi=64 -mhard-float -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build153396803=/tmp/go-build -gno-record-gcc-switches"

What did you do?

  1. build simple golang binary using default flags
    code:
    `
    package main

import (
"fmt"
"time"
)

func main() {
fmt.Print("hellp go")
time.Sleep(10 * time.Second)
}
`

  1. run binary, monitor RSS use gnome-system-monitor & read /proc/[id]/smap

What did you expect to see?

small memory usage like amd64(4-6 MB) /arm (~1 MB)

What did you see instead?

Abnormal memory(RSS) usage. (32+ MB)
@mengzhuo
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mengzhuo commented Dec 9, 2020 •
edited

I can't reproduce this, I find it's 2MB by Go1.15
Could you provide kernel version and grep rss usage ps -eo vsz,rss,comm|grep <your programe name> as the example do?

uname -a
Linux ls3a4k.mzh.io 5.4.38 #1 SMP PREEMPT Sat Aug 29 22:59:15 CST 2020 mips64 mips64 mips64 GNU/Linux

$ps -eo vsz,rss,comm|grep example
$703344  2272 ok

@randall77
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Go reserves larger chunks of virtual memory than it immediately uses as physical memory.
Assuming VmRSS means virtual memory, then I think this is expected. It should not affect physical memory use.

@orcNo
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orcNo commented Dec 10, 2020

I can't reproduce this, I find it's 2MB by Go1.15
Could you provide kernel version and grep rss usage ps -eo vsz,rss,comm|grep <your programe name> as the example do?

uname -a
Linux ls3a4k.mzh.io 5.4.38 #1 SMP PREEMPT Sat Aug 29 22:59:15 CST 2020 mips64 mips64 mips64 GNU/Linux

$ps -eo vsz,rss,comm|grep example
$703344  2272 ok

@mengzhuo

$ps -eo vsz,rss,comm| grep test.out
703392 33680 test.out

$ uname -a
Linux mips-PC 4.19.0-loongson-3-desktop #1288 SMP PREEMPT Tue Jun 30 15:48:02 CST 2020 mips64 GNU/Linux

Use gccgo-8 to compile the same code, the memory usage will become normal.

@orcNo
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orcNo commented Dec 10, 2020

Go reserves larger chunks of virtual memory than it immediately uses as physical memory.
Assuming VmRSS means virtual memory, then I think this is expected. It should not affect physical memory use.

According to the document (proc man-pages)， I think it means the use of physical memory

@mengzhuo
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Go reserves larger chunks of virtual memory than it immediately uses as physical memory.
Assuming VmRSS means virtual memory, then I think this is expected. It should not affect physical memory use.

According to the document (proc man-pages)， I think it means the use of physical memory

Could you dump the memory map of your test program?

cat /proc/`pgrep <binary>`/maps
00010000-00164000 r-xp 00000000 fd:00 67232101                           /root/ok
00170000-0018c000 rwxp 00160000 fd:00 67232101                           /root/ok
0018c000-001bc000 rwxp 00000000 00:00 0
c000000000-c004000000 rwxp 00000000 00:00 0
7fffcc654000-7fffcea08000 rwxp 00000000 00:00 0
7fffcea08000-7fffceb88000 ---p 00000000 00:00 0
7fffceb88000-7fffceb8c000 rwxp 00000000 00:00 0
7fffceb8c000-7fffeea38000 ---p 00000000 00:00 0
7fffeea38000-7fffeea3c000 rwxp 00000000 00:00 0
7fffeea3c000-7ffff2a0c000 ---p 00000000 00:00 0
7ffff2a0c000-7ffff2a10000 rwxp 00000000 00:00 0
7ffff2a10000-7ffff3208000 ---p 00000000 00:00 0
7ffff3208000-7ffff320c000 rwxp 00000000 00:00 0
7ffff320c000-7ffff3308000 ---p 00000000 00:00 0
7ffff3308000-7ffff3368000 rwxp 00000000 00:00 0
7ffffbb08000-7ffffbb2c000 rw-p 00000000 00:00 0                          [stack]
7ffffbff4000-7ffffbff8000 r-xp 00000000 00:00 0
7fffff000000-7fffff004000 r--p 00000000 00:00 0                          [vvar]
7fffff004000-7fffff008000 r-xp 00000000 00:00 0                          [vdso]

@orcNo
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orcNo commented Dec 10, 2020 •
edited

Go reserves larger chunks of virtual memory than it immediately uses as physical memory.
Assuming VmRSS means virtual memory, then I think this is expected. It should not affect physical memory use.

According to the document (proc man-pages)， I think it means the use of physical memory

Could you dump the memory map of your test program?

cat /proc/`pgrep <binary>`/maps
00010000-00164000 r-xp 00000000 fd:00 67232101                           /root/ok
00170000-0018c000 rwxp 00160000 fd:00 67232101                           /root/ok
0018c000-001bc000 rwxp 00000000 00:00 0
c000000000-c004000000 rwxp 00000000 00:00 0
7fffcc654000-7fffcea08000 rwxp 00000000 00:00 0
7fffcea08000-7fffceb88000 ---p 00000000 00:00 0
7fffceb88000-7fffceb8c000 rwxp 00000000 00:00 0
7fffceb8c000-7fffeea38000 ---p 00000000 00:00 0
7fffeea38000-7fffeea3c000 rwxp 00000000 00:00 0
7fffeea3c000-7ffff2a0c000 ---p 00000000 00:00 0
7ffff2a0c000-7ffff2a10000 rwxp 00000000 00:00 0
7ffff2a10000-7ffff3208000 ---p 00000000 00:00 0
7ffff3208000-7ffff320c000 rwxp 00000000 00:00 0
7ffff320c000-7ffff3308000 ---p 00000000 00:00 0
7ffff3308000-7ffff3368000 rwxp 00000000 00:00 0
7ffffbb08000-7ffffbb2c000 rw-p 00000000 00:00 0                          [stack]
7ffffbff4000-7ffffbff8000 r-xp 00000000 00:00 0
7fffff000000-7fffff004000 r--p 00000000 00:00 0                          [vvar]
7fffff004000-7fffff008000 r-xp 00000000 00:00 0                          [vdso]

maps

pgrep test.out | xargs -i%1 cat /proc/%1/maps
00010000-00164000 r-xp 00000000 08:17 55183520                           /home/mips/Go/tdbus/test.out
00170000-0018c000 rwxp 00160000 08:17 55183520                           /home/mips/Go/tdbus/test.out
0018c000-001bc000 rwxp 00000000 00:00 0 
c000000000-c004000000 rwxp 00000000 00:00 0 
ffce504000-ffd08b8000 rwxp 00000000 00:00 0 
ffd08b8000-ffd0a38000 ---p 00000000 00:00 0 
ffd0a38000-ffd0a3c000 rwxp 00000000 00:00 0 
ffd0a3c000-fff08e8000 ---p 00000000 00:00 0 
fff08e8000-fff08ec000 rwxp 00000000 00:00 0 
fff08ec000-fff48bc000 ---p 00000000 00:00 0 
fff48bc000-fff48c0000 rwxp 00000000 00:00 0 
fff48c0000-fff50b8000 ---p 00000000 00:00 0 
fff50b8000-fff50bc000 rwxp 00000000 00:00 0 
fff50bc000-fff51b8000 ---p 00000000 00:00 0 
fff51b8000-fff5218000 rwxp 00000000 00:00 0 
fffbf10000-fffbf34000 rw-p 00000000 00:00 0                              [stack]
fffbff4000-fffbff8000 r-xp 00000000 00:00 0 
ffffc78000-ffffc80000 r--p 00000000 00:00 0                              [vvar]
ffffc80000-ffffc84000 r-xp 00000000 00:00 0                              [vdso]

smaps

pgrep test.out | xargs -i%1 cat /proc/%1/smaps
00010000-00164000 r-xp 00000000 08:17 55183520                           /home/mips/Go/tdbus/test.out
Size:               1360 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                1216 kB
Pss:                1216 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:      1216 kB
Private_Dirty:         0 kB
Referenced:         1040 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    0
VmFlags: rd ex mr mw me dw 
00170000-0018c000 rwxp 00160000 08:17 55183520                           /home/mips/Go/tdbus/test.out
Size:                112 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                 112 kB
Pss:                 112 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:        16 kB
Private_Dirty:        96 kB
Referenced:          112 kB
Anonymous:            96 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    0
VmFlags: rd wr ex mr mw me dw ac 
0018c000-001bc000 rwxp 00000000 00:00 0 
Size:                192 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  80 kB
Pss:                  80 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        80 kB
Referenced:           80 kB
Anonymous:            80 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
c000000000-c004000000 rwxp 00000000 00:00 0 
Size:              65536 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:               32768 kB
Pss:               32768 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:     32768 kB
Referenced:        32768 kB
Anonymous:         32768 kB
LazyFree:              0 kB
AnonHugePages:     32768 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
ffcf154000-ffd1508000 rwxp 00000000 00:00 0 
Size:              36560 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                 176 kB
Pss:                 176 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:       176 kB
Referenced:          176 kB
Anonymous:           176 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
ffd1508000-ffd1688000 ---p 00000000 00:00 0 
Size:               1536 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: mr mw me 
ffd1688000-ffd168c000 rwxp 00000000 00:00 0 
Size:                 16 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  16 kB
Pss:                  16 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        16 kB
Referenced:           16 kB
Anonymous:            16 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
ffd168c000-fff1538000 ---p 00000000 00:00 0 
Size:             522928 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: mr mw me 
fff1538000-fff153c000 rwxp 00000000 00:00 0 
Size:                 16 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  16 kB
Pss:                  16 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        16 kB
Referenced:           16 kB
Anonymous:            16 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
fff153c000-fff550c000 ---p 00000000 00:00 0 
Size:              65344 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: mr mw me 
fff550c000-fff5510000 rwxp 00000000 00:00 0 
Size:                 16 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  16 kB
Pss:                  16 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        16 kB
Referenced:           16 kB
Anonymous:            16 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
fff5510000-fff5d08000 ---p 00000000 00:00 0 
Size:               8160 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: mr mw me 
fff5d08000-fff5d0c000 rwxp 00000000 00:00 0 
Size:                 16 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  16 kB
Pss:                  16 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        16 kB
Referenced:           16 kB
Anonymous:            16 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
fff5d0c000-fff5e08000 ---p 00000000 00:00 0 
Size:               1008 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: mr mw me 
fff5e08000-fff5e68000 rwxp 00000000 00:00 0 
Size:                384 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  96 kB
Pss:                  96 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        96 kB
Referenced:           96 kB
Anonymous:            96 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr ex mr mw me ac 
fffbdd0000-fffbdf4000 rw-p 00000000 00:00 0                              [stack]
Size:                144 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  32 kB
Pss:                  32 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        32 kB
Referenced:           32 kB
Anonymous:            32 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd wr mr mw me gd ac 
fffbff4000-fffbff8000 r-xp 00000000 00:00 0 
Size:                 16 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    1
VmFlags: rd ex mr mw me 
ffff920000-ffff928000 r--p 00000000 00:00 0                              [vvar]
Size:                 32 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    0
VmFlags: rd mr pf io de dd 
ffff928000-ffff92c000 r-xp 00000000 00:00 0                              [vdso]
Size:                 16 kB
KernelPageSize:       16 kB
MMUPageSize:          16 kB
Rss:                  16 kB
Pss:                   0 kB
Shared_Clean:         16 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:           16 kB
Anonymous:             0 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:                0 kB
THPeligible:    0
VmFlags: rd ex mr mw me de

I use the script to collect data from the file(/proc//smaps)， get this

total size 34544  (Kib)
binary size 0
heap size 0
stack size 32
lib size 0
anonymous size 33168
vdso size 16
vvar size 0
unkown size 1328

@orcNo orcNo changed the title Abnormal memory(VmRSS) usage on mips64 Loongson-3A3000: Abnormal memory(VmRSS) usage on mips64 Dec 10, 2020
@mengzhuo
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Contributor

I think It's the THP(Transparent huge pages).

Please take a look at smap/c000000000 sections, it reads THPeligible: 1, this might mark the whole page in used.
You can find out Loonson kernel setting of THP in byte by

$cat /sys/kernel/mm/redhat_transparent_hugepage/enabled
always [madvise] never
$cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size
33554432

which is same as the c000000000 section's Private_Dirty: 32768 kB.

FYI:
https://www.kernel.org/doc/Documentation/vm/transhuge.txt

@orcNo
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Author

orcNo commented Dec 10, 2020 •
edited

I think It's the THP(Transparent huge pages).

Please take a look at smap/c000000000 sections, it reads THPeligible: 1, this might mark the whole page in used.
You can find out Loonson kernel setting of THP in byte by

$cat /sys/kernel/mm/redhat_transparent_hugepage/enabled
always [madvise] never
$cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size
33554432

which is same as the c000000000 section's Private_Dirty: 32768 kB.

FYI:
https://www.kernel.org/doc/Documentation/vm/transhuge.txt

THX ！
I changed the THP configuration, then memory usage becomes normal
#echo never > /sys/kernel/mm/transparent_hugepage/enabled

@orcNo orcNo closed this as completed Dec 10, 2020
@golang golang locked and limited conversation to collaborators Dec 10, 2021
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@mengzhuo @randall77 @gopherbot @orcNo