Messages in this thread | | | Date | Tue, 3 Apr 2007 13:13:16 -0700 | From | "Siddha, Suresh B" <> | Subject | Re: getting processor numbers |
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On Tue, Apr 03, 2007 at 12:55:22PM -0700, Ulrich Drepper wrote: > Siddha, Suresh B wrote:a > > Not all of the cpu* directories in /sys/devices/system/cpu may be > > online. > > Apparently this information isn't needed. It's very easy to verify: > > $ ls /sys/devices/system/cpu/*/online > /sys/devices/system/cpu/cpu1/online /sys/devices/system/cpu/cpu2/online > /sys/devices/system/cpu/cpu3/online > > This is a quad core machine and cpu0 doesn't have the 'online' file > (2.6.19 kernel).
I think that is expected and intentional, as the current cpu hotplug code doesn't support offlining cpu0.
> So, if nobody noticed this it's not needed and we can > just remove CPUs from /sys/devices/system/cpu when they are brought > offline, right?
No. Logical cpu hotplug uses these interfaces to make a cpu go offline and online.
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