[lkml]   [2010]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [2/8,v3] NUMA Hotplug Emulator: infrastructure of NUMA hotplug emulation
On Wed, 17 Nov 2010, wrote:

> From: Haicheng Li <>
> NUMA hotplug emulator introduces a new node state N_HIDDEN to
> identify the fake offlined node. It firstly hides RAM via E820
> table and then emulates fake offlined nodes with the hidden RAM.

Hmm, why can't you use numa=hide to hide a specified quantity of memory
from the kernel and then use the add_memory() interface to hot-add the
offlined memory in the desired quantity? In other words, why do you need
to track the offlined nodes with a state?

The userspace interface would take a desired size of hidden memory to
hot-add and the node id would be the first_unset_node(node_online_map).

> After system bootup, user is able to hotplug-add these offlined
> nodes, which is just similar to a real hardware hotplug behavior.
> Using boot option "numa=hide=N*size" to fake offlined nodes:
> - N is the number of hidden nodes
> - size is the memory size (in MB) per hidden node.

size should be parsed with memparse() so users can specify 'M' or 'G', it
would even make your parsing code simpler.

 \ /
  Last update: 2010-11-17 09:19    [W:0.407 / U:2.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site