Merge pull request #1570 from scop/perf/unnecessary-regexps

Avoid some uses of regexps

cpu/cpu_aix_nocgo.go

@@ -5,15 +5,12 @@ package cpu
 
 import (
 	"context"
-	"regexp"
 	"strconv"
 	"strings"
 
 	"github.com/shirou/gopsutil/v3/internal/common"
 )
 
-var whiteSpaces = regexp.MustCompile(`\s+`)
-
 func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
 	if percpu {
 		return []TimesStat{}, common.ErrNotImplementedError
@@ -28,8 +25,8 @@ func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
 		}
 
 		ret := TimesStat{CPU: "cpu-total"}
-		h := whiteSpaces.Split(lines[len(lines)-3], -1) // headers
-		v := whiteSpaces.Split(lines[len(lines)-2], -1) // values
+		h := strings.Fields(lines[len(lines)-3]) // headers
+		v := strings.Fields(lines[len(lines)-2]) // values
 		for i, header := range h {
 			if t, err := strconv.ParseFloat(v[i], 64); err == nil {
 				switch header {
@@ -58,14 +55,14 @@ func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
 	ret := InfoStat{}
 	for _, line := range strings.Split(string(out), "\n") {
 		if strings.HasPrefix(line, "Number Of Processors:") {
-			p := whiteSpaces.Split(line, 4)
+			p := strings.Fields(line)
 			if len(p) > 3 {
 				if t, err := strconv.ParseUint(p[3], 10, 64); err == nil {
 					ret.Cores = int32(t)
 				}
 			}
 		} else if strings.HasPrefix(line, "Processor Clock Speed:") {
-			p := whiteSpaces.Split(line, 5)
+			p := strings.Fields(line)
 			if len(p) > 4 {
 				if t, err := strconv.ParseFloat(p[3], 64); err == nil {
 					switch strings.ToUpper(p[4]) {

disk/disk_aix_nocgo.go

@@ -12,7 +12,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var whiteSpaces = regexp.MustCompile(`\s+`)
 var startBlank = regexp.MustCompile(`^\s+`)
 
 var ignoreFSType = map[string]bool{"procfs": true}
@@ -60,7 +59,7 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
 		if startBlank.MatchString(line) {
 			line = "localhost" + line
 		}
-		p := whiteSpaces.Split(lines[idx], 6)
+		p := strings.Fields(lines[idx])
 		if len(p) < 5 || ignoreFSType[p[colidx["vfs"]]] {
 			continue
 		}

mem/mem_aix_nocgo.go

@@ -5,15 +5,12 @@ package mem
 
 import (
 	"context"
-	"regexp"
 	"strconv"
 	"strings"
 
 	"github.com/shirou/gopsutil/v3/internal/common"
 )
 
-var whiteSpaces = regexp.MustCompile(`\s+`)
-
 func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
 	vmem, swap, err := callSVMon(ctx)
 	if err != nil {
@@ -49,7 +46,7 @@ func callSVMon(ctx context.Context) (*VirtualMemoryStat, *SwapMemoryStat, error)
 	swap := &SwapMemoryStat{}
 	for _, line := range strings.Split(string(out), "\n") {
 		if strings.HasPrefix(line, "memory") {
-			p := whiteSpaces.Split(line, 7)
+			p := strings.Fields(line)
 			if len(p) > 2 {
 				if t, err := strconv.ParseUint(p[1], 10, 64); err == nil {
 					vmem.Total = t * pagesize
@@ -65,7 +62,7 @@ func callSVMon(ctx context.Context) (*VirtualMemoryStat, *SwapMemoryStat, error)
 				}
 			}
 		} else if strings.HasPrefix(line, "pg space") {
-			p := whiteSpaces.Split(line, 4)
+			p := strings.Fields(line)
 			if len(p) > 3 {
 				if t, err := strconv.ParseUint(p[2], 10, 64); err == nil {
 					swap.Total = t * pagesize