[lkml]   [2016]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v4 4/5] mm: make processing of movable_node arch-specific

On 26/10/16 02:55, Reza Arbab wrote:
> On Tue, Oct 25, 2016 at 11:15:40PM +1100, Balbir Singh wrote:
>> After the ack, I realized there were some more checks needed, IOW
>> questions for you :)
> Hey! No takebacks!

I still believe we need your changes, I was wondering if we've tested
it against normal memory nodes and checked if any memblock
allocations end up there. Michael showed me some memblock
allocations on node 1 of a two node machine with movable_node
I'll double check at my end. See my question below

> The short answer is that neither of these is a concern.
> Longer; if you use "movable_node", x86 can identify these nodes at boot. They call memblock_mark_hotplug() while parsing the SRAT. Then, when the zones are initialized, those markings are used to determine ZONE_MOVABLE.
> We have no analog of this SRAT information, so our movable nodes can only be created post boot, by hotplugging and explicitly onlining with online_movable.

Is this true for all of system memory as well or only for nodes
hotplugged later?

Balbir Singh.

 \ /
  Last update: 2016-10-26 00:35    [W:0.666 / U:0.936 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site