Messages in this thread | | | Date | Tue, 23 Nov 2010 00:04:12 +0800 | From | Américo Wang <> | Subject | Re: [8/8,v3] NUMA Hotplug Emulator: documentation |
| |
On Mon, Nov 22, 2010 at 07:33:51AM +0800, Shaohui Zheng wrote: >On Sun, Nov 21, 2010 at 11:03:45PM +0800, Américo Wang wrote: >> >> >From your documentation above, it looks like you are trying >> to move one CPU between nodes? >Yes, you are correct. With cpu probe/release interface, you can hot-remove a >CPU from a node, and hot-add it to another node.
Can I also move the CPU to another node _after_ it is hot-added? Or I have to hot-remove it first and then hot-add it again?
>> >> >+ cpu_hpe=on/off >> >+ Enable/disable cpu hotplug emulation with software method. when cpu_hpe=on, >> >+ sysfs provides probe/release interface to hot add/remove cpu dynamically. >> >+ this option is disabled in default. >> >+ >> >> Why not just a CONFIG? IOW, why do we need to make another boot >> parameter for this? >Only the developer or QA will use the emulator, we did not want to change the >default action for common user who does not care the hotplug emulator, so we >use a kernel parameter as a switch. The common user is not aware the existence >of the emulator. >
I think it is also useful to other Linux users, e.g. after I boot with "maxcpus=1", I can still bring the rest 3 CPU's back without reboot.
Thanks.
-- Live like a child, think like the god.
-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |