[lkml]   [2011]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [PATCH v4 0/7] x86: BSP or CPU0 online/offline
> We need a debug feature for this: CONFIG_DEBUG_BOOT_CPU_OFF=y or
> such (disabled by default): this feature would offline the boot
> CPU as soon as possible, and boot up userspace with the boot CPU
> offlined.

I would think the earliest time when CPU0 can be offline is right after do_initcalls() because do_initcalls() installs some cpu hotplug notifier.

But this will change generic code (e.g. add arch hook in init/main.c or add a new initcall level which is after level 7s).

Another way is to offline CPU0 (or any CPU) in /etc/rc.local. By this way, we don't change kernel. And this is safe, but a bit later than in kernel.

Any comment?



 \ /
  Last update: 2011-12-15 19:41    [W:0.127 / U:19.296 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site