Re: [RFC][PATCH] node hotplug : register_cpu() changes [0/3]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On Tue, 23 May 2006 07:52:03 -0700
Ashok Raj <[email protected]> wrote:

> On Tue, May 23, 2006 at 07:56:36PM +0900, KAMEZAWA Hiroyuki wrote:
> > I found acpi container, which describes node, could evaluate cpu before
> > memory. This means cpu-hot-add occurs before memory hot add.
> > 
> Is it possible to process memory before cpu in container hot-add code?

Maybe No. I know ACPI people doesn't want to add special handling for cpu/memory
in a container. It complicates the code very much.

> > 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
> Dont you need all per-cpu allocated on that node? Or is it from node0 or 
> something for all hotpluggable cpus?
I want to allocate on-node. But it's impossible now because per-cpu-pages
has to be allocated at boot-time as for possible cpus. They has to be
off-node now. They are from node0 (ia64) now.

I want to migrate per-cpu when a cpu is enabled (if I can). But maybe there
is a code which has pointer to object in per-cpu area.

> If node is online first, then all allocations come from that node, thought you
> *want* to ensure node/mem is online before cpu is up to get that benefit.
Yes. But per-cpu should be allocated at boot-time now. I'd like to go step-by-step.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at
Please read the FAQ at

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux