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`/usr/lib/pm-utils/sleep.d/94cpufreq` 尝试做什么？

tag-icon • tag-icon bash shell-script cpu-frequency
`/usr/lib/pm-utils/sleep.d/94cpufreq` 尝试做什么？

在我的 Ubuntu 16.04 上，我试图理解系统默认文件/usr/lib/pm-utils/sleep.d/94cpufreq（有关其内容，请参阅本文末尾。）

是"${PM_FUNCTIONS}"一个脚本，因为它的来源是.？

当我echo "${PM_FUNCTIONS}" 在 bash 中时，它什么也不输出。是PM_FUNCTIONS在调用该脚本的另一个脚本中定义的吗？

savestate、state_exists和restorestate函数是在 中定义的"${PM_FUNCTIONS}"吗？

变量TEMPORARY_CPUFREQ_GOVERNOR"定义在"${PM_FUNCTIONS}"?

该脚本试图在suspend|hibernate之上做什么thaw|resume？

谢谢。

#!/bin/sh                                                                                                                                                                          
# Ensure cpu governor is set to something sane.                                                                                                                                    
# TODO: Which of the cpu governors is still insane?  File bugs against                                                                                                             
#       those that are.                                                                                                                                                            

. "${PM_FUNCTIONS}"

[ -d /sys/devices/system/cpu/ ] || exit $NA

hibernate_cpufreq()
{
  ( cd /sys/devices/system/cpu/
  for x in cpu[0-9]*; do
    # if cpufreq is a symlink, it is handled by another cpu. Skip.                                                                                                                 
    [ -L "$x/cpufreq" ] && continue
    gov="$x/cpufreq/scaling_governor"
    # if we do not have a scaling_governor file, skip.                                                                                                                             
    [ -f "$gov" ] || continue
    # if our temporary governor is not available, skip.                                                                                                                            
    grep -q "$TEMPORARY_CPUFREQ_GOVERNOR" \
            "$x/cpufreq/scaling_available_governors" || continue
    savestate "${x}_governor" < "$gov"
    echo "$TEMPORARY_CPUFREQ_GOVERNOR" > "$gov"
  done )
}

thaw_cpufreq()
{
  ( cd /sys/devices/system/cpu/
  for x in cpu[0-9]*/cpufreq/scaling_governor ; do
    [ -f "$x" ] || continue
    state_exists "${x%%/*}_governor" || continue
    restorestate "${x%%/*}_governor" > "$x"
  done )
}

case "$1" in
  suspend|hibernate)
    hibernate_cpufreq
    ;;
  resume|thaw)
    thaw_cpufreq
    ;;
  *) exit $NA
    ;;
esac

答案1

函数state_exists等定义在/usr/lib/pm-utils/函数并PM_FUNCTIONS引用脚本/usr/lib/pm-utils/pm-functions。是的，TEMPORARY_CPUFREQ_GOVERNOR是在 中定义的PM_FUNCTIONS。

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