On Tue, 15 Sep 2009 17:37:06 +0530 Gautham R Shenoy wrote: > Signed-off-by: Gautham R Shenoy <e...@in.ibm.com> > --- > Documentation/cpu-hotplug.txt | 22 +++++ > drivers/base/cpu.c | 181 > +++++++++++++++++++++++++++++++++++++++-- > include/linux/cpu.h | 10 ++ > 3 files changed, 204 insertions(+), 9 deletions(-) > > diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt > index 9d620c1..dcec06d 100644 > --- a/Documentation/cpu-hotplug.txt > +++ b/Documentation/cpu-hotplug.txt > @@ -115,6 +115,28 @@ Just remember the critical section cannot call any > function that can sleep or schedule this process away. The preempt_disable() > will work as long as stop_machine_run() is used to take a cpu down. > > +CPU-offline states > +-------------------------------------- > +On architectures which allow the more than one valid state when
^drop "the" > +the CPU goes offline, the system administrator can decide > +the state the CPU needs to go to when it is offlined. s/needs to/should/ > + > +If the architecture has implemented a cpu-offline driver exposing these > +multiple offline states, the system administrator can use the following sysfs > +interfaces to query the available hotplug states and also query and set the > +current hotplug state for a given cpu: > + > +To query the hotplug states, on needs to perform a read on: one > +/sys/devices/system/cpu/cpu<number>/available_hotplug_states > + > +To query or set the current state for a particular CPU, > +one needs to use the sysfs interface > + > +/sys/devices/system/cpu/cpu<number>/current_hotplug_state > + > +Writes to the "online" sysfs files are serialized against the writes to the > +"current_hotplug_state" file. > + > CPU Hotplug - Frequently Asked Questions. > > Q: How to enable my kernel to support CPU hotplug? --- ~Randy _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev