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sys.go
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sys.go
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package system
// Manipulate /sys/ switches.
import (
"io/ioutil"
"os"
"path"
"regexp"
"strconv"
"strings"
)
// GetSysString read a /sys/ key and return the string value.
func GetSysString(parameter string) (string, error) {
val, err := ioutil.ReadFile(path.Join("/sys", strings.Replace(parameter, ".", "/", -1)))
if err != nil {
WarningLog("failed to read sys string key '%s': %v", parameter, err)
return "PNA", err
}
return strings.TrimSpace(string(val)), nil
}
// GetSysChoice read a /sys/ key that comes with current value and alternative
// choices, return the current choice or empty string.
func GetSysChoice(parameter string) (string, error) {
val, err := ioutil.ReadFile(path.Join("/sys", strings.Replace(parameter, ".", "/", -1)))
if err != nil {
WarningLog("failed to read sys key of choices '%s': %v", parameter, err)
return "PNA", err
}
// Split up the choices
allChoices := consecutiveSpaces.Split(string(val), -1)
for _, choice := range allChoices {
if len(choice) > 2 && choice[0] == '[' && choice[len(choice)-1] == ']' {
return choice[1 : len(choice)-1], nil
}
}
return "", nil
}
// GetSysInt read an integer /sys/ key.
func GetSysInt(parameter string) (int, error) {
value, err := GetSysString(parameter)
if err != nil {
WarningLog("failed to read integer sys key '%s': %v", parameter, err)
return 0, err
}
return strconv.Atoi(value)
}
// SetSysString write a string /sys/ value.
func SetSysString(parameter, value string) error {
if value == "PNA" {
WarningLog("value is '%s', so sys key '%s' is/was not supported by os, skipping.", value, parameter)
return nil
}
err := ioutil.WriteFile(path.Join("/sys", strings.Replace(parameter, ".", "/", -1)), []byte(value), 0644)
if os.IsNotExist(err) {
WarningLog("sys key '%s' is not supported by os, skipping.", parameter)
} else if err != nil {
WarningLog("failed to set sys key '%s' to string '%s': %v", parameter, value, err)
return err
}
return nil
}
// SetSysInt write an integer /sys/ value.
func SetSysInt(parameter string, value int) error {
return SetSysString(parameter, strconv.Itoa(value))
}
// TestSysString Test writing a string /sys/ value.
func TestSysString(parameter, value string) error {
save, err := GetSysString(parameter)
if err != nil {
WarningLog("failed to get sys key '%s': %v", parameter, err)
return err
}
if err = ioutil.WriteFile(path.Join("/sys", strings.Replace(parameter, ".", "/", -1)), []byte(value), 0644); err == nil {
// set key back to previous value, because this was only a test
err = ioutil.WriteFile(path.Join("/sys", strings.Replace(parameter, ".", "/", -1)), []byte(save), 0644)
}
return err
}
// GetSysSearchParam returns the search pattern for a given sys key
// and the conterpart section
func GetSysSearchParam(syskey string) (string, string) {
searchParam := ""
sect := ""
// blkdev
sched := regexp.MustCompile(`block.*queue\.scheduler$`)
nrreq := regexp.MustCompile(`block.*queue\.nr_requests$`)
rakb := regexp.MustCompile(`block.*queue\.read_ahead_kb$`)
mskb := regexp.MustCompile(`block.*queue\.max_sectors_kb$`)
dev := regexp.MustCompile(`block\.(.*)\.queue\..*$`)
d := dev.FindStringSubmatch(syskey)
bdev := ""
if len(d) > 0 {
bdev = d[1]
} else {
dev = regexp.MustCompile(`.*_(\w+)$`)
d = dev.FindStringSubmatch(syskey)
if len(d) > 0 {
bdev = d[1]
}
}
switch {
case syskey == "THP":
searchParam = "sys:" + SysKernelTHPEnabled
sect = "sys"
case syskey == "sys:"+SysKernelTHPEnabled:
searchParam = "THP"
sect = "vm"
case syskey == "KSM":
searchParam = "sys:" + SysKSMRun
sect = "sys"
case syskey == "sys:"+SysKSMRun:
searchParam = "KSM"
sect = "vm"
case IsSched.MatchString(syskey):
searchParam = "sys:block." + bdev + ".queue.scheduler"
sect = "sys"
case sched.MatchString(syskey):
searchParam = "IO_SCHEDULER_" + bdev
sect = "block"
case IsNrreq.MatchString(syskey):
searchParam = "sys:block." + bdev + ".queue.nr_requests"
sect = "sys"
case nrreq.MatchString(syskey):
searchParam = "NRREQ_" + bdev
sect = "block"
case IsRahead.MatchString(syskey):
searchParam = "sys:block." + bdev + ".queue.read_ahead_kb"
sect = "sys"
case rakb.MatchString(syskey):
searchParam = "READ_AHEAD_KB_" + bdev
sect = "block"
case IsMsect.MatchString(syskey):
searchParam = "sys:block." + bdev + ".queue.max_sectors_kb"
sect = "sys"
case mskb.MatchString(syskey):
searchParam = "MAX_SECTORS_KB_" + bdev
sect = "block"
}
return searchParam, sect
}
// GetNrTags returns the value from /sys/block/<bdev>/mq/0/nr_tags and the
// related scheduler
func GetNrTags(key string) (int, string, string) {
nrtags := 0
elev := ""
disk := ""
dname := regexp.MustCompile(`^NRREQ_(\w+\-?\d*)$`)
bdev := dname.FindStringSubmatch(key)
if len(bdev) > 0 {
nrTagsFile := path.Join("block", bdev[1], "mq", "0", "nr_tags")
if _, err := os.Stat(path.Join("/sys", nrTagsFile)); err == nil {
nrtags, _ = GetSysInt(nrTagsFile)
}
elev, _ = GetSysChoice(path.Join("block", bdev[1], "queue", "scheduler"))
disk = bdev[1]
}
return nrtags, elev, disk
}