Messages in this thread |  | | | From | lists@frednet ... | | Date | Mon, 5 Feb 2001 15:19:17 -0600 | | Subject | Re: [PATCH] Hot swap CPU support for 2.4.1@ |
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Would any special hardware besides a multi-cpu system be necessarey to test this out?
Matthew Fredrickson
On Mon, Feb 05, 2001 at 03:00:40PM +1100, Rusty Russell wrote: > Hi all, > > I did the infrastructure, Anton did the bugfinding and PPC support, > aka. the hard stuff. Other architectures need to implement > __cpu_disable, __cpu_die and __cpu_up for them to work. Volunteers > appreciated. > > This patch allows you to down & up CPUs as follows: > # echo 0 > /proc/sys/cpu/0/online > # echo 1 > /proc/sys/cpu/0/online > > The relatively trivial patch works as follows: > > 1) Implements synchronize_kernel() (thanks Andi Kleen for forwarding > Paul McKenney's quiescent-state ideas) which waits for a schedule > on all CPUs. > 2) All CPU numbers are now physical: removes cpu_number_map, > cpu_logical_map and smp_num_cpus. > 3) Adds cpu_online(cpu) and cpu_num_online() macros. > 4) Adds cpu_down() and cpu_up() calls, which call arch-specific > __cpu_disable(cpu), __cpu_die(cpu) and __cpu_up(cpu). > 5) Fixes schedule() to check allowed_cpus even if rescheduling same > task. > > Since it's 60k long, mime attached bzip2. > > Go hack! > Rusty Russell & Anton Blanchard > --
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