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slice.go
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// Copyright (c) Efficient Go Authors
// Licensed under the Apache License 2.0.
package main
import (
"fmt"
"os"
"runtime"
)
var m = &runtime.MemStats{}
func _printHeapUsageAndWait() {
runtime.GC()
runtime.ReadMemStats(m)
fmt.Println(m.HeapAlloc)
fmt.Scanln() // wait for Enter Key
}
// Interactive example of influence of access patterns and GC when using a memory block.
// Read more in "Efficient Go"; Example 5-5, Example 5-6.
/*
# command-line-arguments
./slice.go:25:13: inlining call to fmt.Println
./slice.go:26:12: inlining call to fmt.Scanln
./slice.go:25:15: m.HeapAlloc escapes to heap
./slice.go:25:13: []interface {}{...} does not escape
./slice.go:11:11: make([]byte, size) escapes to heap
<autogenerated>:1: leaking param content: .this
*/
func main() {
fmt.Println("PID", os.Getpid())
b := make([]byte, 600*1024*1024) // 600 MB
// If we would pause the program now `cat /proc/<PID>/smaps | grep -A22 7ff358296000-7ff362d38000 | grep Rss`
_printHeapUsageAndWait()
b[5000] = 3
_printHeapUsageAndWait()
b[100000] = 2
_printHeapUsageAndWait()
b[104000] = 1
_printHeapUsageAndWait()
for i := range b {
b[i] = 3
}
_printHeapUsageAndWait()
b[0] = 1
b = nil
_printHeapUsageAndWait()
_printHeapUsageAndWait()
b = make([]byte, 300*1024*1024) // 300 MB
for i := range b {
b[i] = 3
}
_printHeapUsageAndWait()
runtime.KeepAlive(b)
_printHeapUsageAndWait()
}
/*
cat /proc/2077387/smaps | grep -A22 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 548 kB
Pss: 548 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 548 kB
Referenced: 548 kB
Anonymous: 548 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
➜ ~ cat /proc/2077387/smaps | grep -A22 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 596 kB
Pss: 596 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 596 kB
Referenced: 596 kB
Anonymous: 596 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
➜ ~ cat /proc/2077387/smaps | grep -A22 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 600 kB
Pss: 600 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 600 kB
Referenced: 600 kB
Anonymous: 600 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
➜ ~ cat /proc/2077387/smaps | grep -A22 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 636 kB
Pss: 636 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 636 kB
Referenced: 636 kB
Anonymous: 636 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
➜ ~ cat /proc/2077387/smaps | grep -A22 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 1136 kB
Pss: 1136 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 1136 kB
Referenced: 1136 kB
Anonymous: 1136 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 612352 kB
Pss: 612352 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 612352 kB
Referenced: 612352 kB
Anonymous: 612352 kB
LazyFree: 0 kB
AnonHugePages: 612352 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 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 ac sd hg
➜ ~ cat /proc/2077387/smaps | grep -A22 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 1208 kB
Pss: 1208 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 1208 kB
Referenced: 1208 kB
Anonymous: 1208 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
go run slice.go
PID 2077387
629312016
629317296
629317296
629317296
629317296
171696
VmRSS: 21680 kB
➜ ~ cat /proc/2079522/status | grep VmRSS
VmRSS: 22080 kB
➜ ~ cat /proc/2079522/status | grep VmRSS
VmRSS: 22080 kB
➜ ~ cat /proc/2079522/status | grep VmRSS
VmRSS: 22080 kB
➜ ~ cat /proc/2079522/status | grep VmRSS
VmRSS: 636636 kB
➜ ~ cat /proc/2079522/status | grep VmRSS
VmRSS: 22880 kB
cat /proc/3290226/smaps | grep -A38 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 508 kB
Pss: 508 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 508 kB
Referenced: 508 kB
Anonymous: 508 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
c025800000-c025c00000 rw-p 00000000 00:00 0
Size: 4096 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 120 kB
Pss: 120 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 120 kB
Referenced: 120 kB
Anonymous: 120 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
➜ efficient-go git:(main) ✗ cat /proc/3290226/smaps | grep -A38 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 544 kB
Pss: 544 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 544 kB
Referenced: 544 kB
Anonymous: 544 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
c025800000-c025c00000 rw-p 00000000 00:00 0
Size: 4096 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 120 kB
Pss: 120 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 120 kB
Referenced: 120 kB
Anonymous: 120 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
➜ efficient-go git:(main) ✗ cat /proc/3290226/smaps | grep -A38 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 552 kB
Pss: 552 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 552 kB
Referenced: 552 kB
Anonymous: 552 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
c025800000-c025c00000 rw-p 00000000 00:00 0
Size: 4096 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 152 kB
Pss: 152 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 152 kB
Referenced: 152 kB
Anonymous: 152 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
➜ efficient-go git:(main) ✗ cat /proc/3290226/smaps | grep -A38 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 556 kB
Pss: 556 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 556 kB
Referenced: 556 kB
Anonymous: 556 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
c025800000-c025c00000 rw-p 00000000 00:00 0
Size: 4096 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 184 kB
Pss: 184 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 184 kB
Referenced: 184 kB
Anonymous: 184 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
cat /proc/3290226/smaps | grep -A38 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 1568 kB
Pss: 1568 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 1568 kB
Referenced: 1548 kB
Anonymous: 1568 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 612352 kB
Pss: 612352 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 612352 kB
Referenced: 612352 kB
Anonymous: 612352 kB
LazyFree: 0 kB
AnonHugePages: 612352 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 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 ac sd hg
c025800000-c025c00000 rw-p 00000000 00:00 0
Size: 4096 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 1240 kB
Pss: 1240 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 1240 kB
Referenced: 1204 kB
Anonymous: 1240 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
➜ efficient-go git:(main) ✗ cat /proc/3290226/smaps | grep -A38 c000200000
c000000000-c000200000 rw-p 00000000 00:00 0
Size: 2048 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 1568 kB
Pss: 1568 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 1568 kB
Referenced: 1552 kB
Anonymous: 1568 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 0 kB
THPeligible: 0
VmFlags: rd wr mr mw me ac sd
c000200000-c025800000 rw-p 00000000 00:00 0
Size: 612352 kB
KernelPageSize: 4 kB
MMUPageSize: 4 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
FilePmdMapped: 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 ac sd hg
c025800000-c025c00000 rw-p 00000000 00:00 0
Size: 4096 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 60 kB
Pss: 60 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 60 kB
Referenced: 56 kB
Anonymous: 60 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
*/