General question to anyone who may know...
According to this document:
http://www.mjmwired.net/kernel/Documentation/cpu-hotplug.txt
I see that /sys/devices/system/cpu/cpuX/online contains the current
CPU hotplugging state. You can logically offline a CPU by "echo 0
> /.../offline", and you can check the state of the CPU by "cat /.../
offline" (it'll be 0 or 1).
However, looking on my RHEL 5.1 machine, I see:
------
% ls -l /sys/devices/system/cpu/cpu*/online
-rw------- 1 root root 4096 Aug 12 11:10 /sys/devices/system/cpu/cpu1/
online
-rw------- 1 root root 4096 Aug 12 11:10 /sys/devices/system/cpu/cpu2/
online
-rw------- 1 root root 4096 Aug 12 11:10 /sys/devices/system/cpu/cpu3/
online
------
Which seems weird:
1. There's no "online" file for cpu0 (even though the cpu0/ directory
exists). Perhaps you're not allowed to offline cpu0?
2. The perms on these files are 600, which seems pretty useless --
only root can read them.
Does anyone know if this is normal?
--
Jeff Squyres
Cisco Systems
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