Messages in this thread | | | Date | Tue, 23 May 2006 19:56:36 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [RFC][PATCH] node hotplug : register_cpu() changes [0/3] |
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With Goto-san's patch, we can add new pgdat/node in runtime. I'm now considering node-hot-add with cpu + memory on ACPI.
I found acpi container, which describes node, could evaluate cpu before memory. This means cpu-hot-add occurs before memory hot add.
In most part, cpu-hot-add doesn't depend on node hot add. But register_cpu, which creates symbolic link from node to cpu, requires that node should be onlined before register_cpu(). When a node is onlined, its pgdat should be there.
This patch-set holds off creating symbolic link from node to cpu until node is onlined.
[1/3] modifies register_cpu [2/3] changes caller of register cpu [3/3] changes register_node. create symbolic link fron node to cpu.
By these patch, (cpu + memory) node hot add will succeed. (cpu-only)/(IO-only) node hot add will need more fixes. (But we need this ?)
And ia64 needs more fixes. I'll post later.
-Kame
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