* [PATCH] Hotplug CPUs for i386 2.5.44
@ 2002-10-28 8:04 Rusty Russell
2002-01-15 19:34 ` Pavel Machek
2002-10-29 19:34 ` Matthew Dobson
0 siblings, 2 replies; 3+ messages in thread
From: Rusty Russell @ 2002-10-28 8:04 UTC (permalink / raw)
To: linux-kernel; +Cc: akpm, mingo, mochel
Doesn't apply to -mm5 because someone did wierd things with the CPU
placement in driverfs, which clashes with this patch which moves it to
kernel/cpu.c...
Usage:
1) Apply patch, and boot resulting kernel.
2) echo 0 > /devices/root/sys/cpu0/online
3) echo 1 > /devices/root/sys/cpu0/online
The CPU actually spins with interrupts off, doing cpu_relax() and
polling a variable. It's basically useful for testing the unplug
infrastructure and benchmarking.
http://www.kernel.org/pub/linux/kernel/people/rusty/patches/hotcpu-x86-28-10-2002.2.5.44.diff.gz
Cheers!
Rusty.
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Hotplug CPUs for i386 2.5.44
2002-10-28 8:04 [PATCH] Hotplug CPUs for i386 2.5.44 Rusty Russell
@ 2002-01-15 19:34 ` Pavel Machek
2002-10-29 19:34 ` Matthew Dobson
1 sibling, 0 replies; 3+ messages in thread
From: Pavel Machek @ 2002-01-15 19:34 UTC (permalink / raw)
To: Rusty Russell; +Cc: linux-kernel, akpm, mingo, mochel
Hi!
> Usage:
> 1) Apply patch, and boot resulting kernel.
> 2) echo 0 > /devices/root/sys/cpu0/online
> 3) echo 1 > /devices/root/sys/cpu0/online
>
> The CPU actually spins with interrupts off, doing cpu_relax() and
> polling a variable. It's basically useful for testing the unplug
> infrastructure and benchmarking.
Hehe, with this swsusp should be doable on
an smp machine (turn it into UP and suspend;
during resume, turn it into UP, resume, and go
back SMP). I guess I schould get some SMP
to play with...
Pavel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Hotplug CPUs for i386 2.5.44
2002-10-28 8:04 [PATCH] Hotplug CPUs for i386 2.5.44 Rusty Russell
2002-01-15 19:34 ` Pavel Machek
@ 2002-10-29 19:34 ` Matthew Dobson
1 sibling, 0 replies; 3+ messages in thread
From: Matthew Dobson @ 2002-10-29 19:34 UTC (permalink / raw)
To: Rusty Russell; +Cc: linux-kernel, akpm, mingo, mochel
Rusty Russell wrote:
> Doesn't apply to -mm5 because someone did wierd things with the CPU
> placement in driverfs, which clashes with this patch which moves it to
> kernel/cpu.c...
>
> Usage:
> 1) Apply patch, and boot resulting kernel.
> 2) echo 0 > /devices/root/sys/cpu0/online
> 3) echo 1 > /devices/root/sys/cpu0/online
<grins sheepishly>
Errr.. you may want to use
/devices/class/cpu/devices/[0..num_online_cpus()]. There are symlinks
here for every registered CPU device, no matter how some NUMA wacko
rearranges the root/sys directory topology. ;)
Cheers!
-Matt
> The CPU actually spins with interrupts off, doing cpu_relax() and
> polling a variable. It's basically useful for testing the unplug
> infrastructure and benchmarking.
>
> http://www.kernel.org/pub/linux/kernel/people/rusty/patches/hotcpu-x86-28-10-2002.2.5.44.diff.gz
>
> Cheers!
> Rusty.
> --
> Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
> -
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-10-28 8:04 [PATCH] Hotplug CPUs for i386 2.5.44 Rusty Russell
2002-01-15 19:34 ` Pavel Machek
2002-10-29 19:34 ` Matthew Dobson
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