On 01/26/2013 09:29 AM, H. Peter Anvin wrote:
On 01/25/2013 05:12 PM, Andrew Morton wrote:
On Fri, 25 Jan 2013 17:42:09 +0800
Tang Chen<tangchen@xxxxxxxxxxxxxx> wrote:
NOTE: Using this way will cause NUMA performance down because the whole node
will be set as ZONE_MOVABLE, and kernel cannot use memory on it.
If users don't want to lose NUMA performance, just don't use it.
I agree with this, but it means that nobody will test any of your new code.
To get improved testing coverage, can you think of any temporary
testing-only patch which will cause testers to exercise the
memory-hotplug changes?
There is another problem: if ALL the nodes in the system support
hotpluggable memory, what happens?
Hi HPA,
I think I missed this case. If all the memory is hotpluggable, and user
specified
movablemem_map=acpi, all the memory could be set as movable, and the
kernel will
fail to start.
I will post a patch to fix it. How about always keep node0 unhotpluggable ?
Thanks. :)
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