/proc/sysrq-trigger详解

下面将sysrq.txt中的内容附加上一段，全部可以使用的command：

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

66 'b'     - Will immediately reboot the system without syncing or unmounting

67           your disks.

68  

69 'c' - Will perform a system crash by a NULL pointer dereference.

70           A crashdump will be taken if configured.

71  

72 'd' - Shows all locks that are held.

73  

74 'e'     - Send a SIGTERM to all processes, except for init.

75  

76 'f' - Will call oom_kill to kill a memory hog process.

77  

78 'g' - Used by kgdb on ppc and sh platforms.

79  

80 'h'     - Will display help (actually any other key than those listed

81           here will display help. but 'h' is easy to remember :-)

82  

83 'i'     - Send a SIGKILL to all processes, except for init.

84  

85 'j'     - Forcibly "Just thaw it" - filesystems frozen by the FIFREEZE ioctl.

86  

87 'k'     - Secure Access Key (SAK) Kills all programs on the current virtual

88           console. NOTE: See important comments below in SAK section.

89  

90 'l'     - Shows a stack backtrace for all active CPUs.

91  

92 'm'     - Will dump current memory info to your console.

93  

94 'n' - Used to make RT tasks nice-able

95  

96 'o'     - Will shut your system off (if configured and supported).

97  

98 'p'     - Will dump the current registers and flags to your console.

99  

100 'q'     - Will dump per CPU lists of all armed hrtimers (but NOT regular

101           timer_list timers) and detailed information about all

102           clockevent devices.

103  

104 'r'     - Turns off keyboard raw mode and sets it to XLATE.

105  

106 's'     - Will attempt to sync all mounted filesystems.

107

108 't'     - Will dump a list of current tasks and their information to your

109           console.

110  

111 'u'     - Will attempt to remount all mounted filesystems read-only.

112  

113 'v' - Dumps Voyager SMP processor info to your console.

114  

115 'w' - Dumps tasks that are in uninterruptable (blocked) state.

116  

117 'x' - Used by xmon interface on ppc/powerpc platforms.

118  

119 'z' - Dump the ftrace buffer

120  

121 '0'-'9' - Sets the console log level, controlling which kernel messages

122           will be printed to your console. ('0', for example would make

123           it so that only emergency messages like PANICs or OOPSes would

124           make it to your console.)

125

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