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SubjectRe: [PATCH] mm/alloc: fallback to first node if the wanted node offline
On Thu 20-12-18 15:19:39, Pingfan Liu wrote:
> Hi Michal,
>
> WIth this patch applied on the old one, I got the following message.
> Please get it from attachment.
[...]
> [ 0.409637] NUMA: Node 1 [mem 0x00000000-0x0009ffff] + [mem 0x00100000-0x7fffffff] -> [mem 0x00000000-0x7fffffff]
> [ 0.419858] NUMA: Node 1 [mem 0x00000000-0x7fffffff] + [mem 0x100000000-0x47fffffff] -> [mem 0x00000000-0x47fffffff]
> [ 0.430356] NODE_DATA(0) allocated [mem 0x87efd4000-0x87effefff]
> [ 0.436325] NODE_DATA(0) on node 5
> [ 0.440092] Initmem setup node 0 [mem 0x0000000000000000-0x0000000000000000]
> [ 0.447078] node[0] zonelist:
> [ 0.450106] NODE_DATA(1) allocated [mem 0x47ffd5000-0x47fffffff]
> [ 0.456114] NODE_DATA(2) allocated [mem 0x87efa9000-0x87efd3fff]
> [ 0.462064] NODE_DATA(2) on node 5
> [ 0.465852] Initmem setup node 2 [mem 0x0000000000000000-0x0000000000000000]
> [ 0.472813] node[2] zonelist:
> [ 0.475846] NODE_DATA(3) allocated [mem 0x87ef7e000-0x87efa8fff]
> [ 0.481827] NODE_DATA(3) on node 5
> [ 0.485590] Initmem setup node 3 [mem 0x0000000000000000-0x0000000000000000]
> [ 0.492575] node[3] zonelist:
> [ 0.495608] NODE_DATA(4) allocated [mem 0x87ef53000-0x87ef7dfff]
> [ 0.501587] NODE_DATA(4) on node 5
> [ 0.505349] Initmem setup node 4 [mem 0x0000000000000000-0x0000000000000000]
> [ 0.512334] node[4] zonelist:
> [ 0.515370] NODE_DATA(5) allocated [mem 0x87ef28000-0x87ef52fff]
> [ 0.521384] NODE_DATA(6) allocated [mem 0x87eefd000-0x87ef27fff]
> [ 0.527329] NODE_DATA(6) on node 5
> [ 0.531091] Initmem setup node 6 [mem 0x0000000000000000-0x0000000000000000]
> [ 0.538076] node[6] zonelist:
> [ 0.541109] NODE_DATA(7) allocated [mem 0x87eed2000-0x87eefcfff]
> [ 0.547090] NODE_DATA(7) on node 5
> [ 0.550851] Initmem setup node 7 [mem 0x0000000000000000-0x0000000000000000]
> [ 0.557836] node[7] zonelist:

OK, so it is clear that building zonelists this early is not going to
fly. We do not have the complete information yet. I am not sure when do
we get that at this moment but I suspect the we either need to move that
initialization to a sooner stage or we have to reconsider whether the
phase when we build zonelists really needs to consider only online numa
nodes.

[...]
> [ 1.067658] percpu: Embedded 46 pages/cpu @(____ptrval____) s151552 r8192 d28672 u262144
> [ 1.075692] node[1] zonelist: 1:Normal 1:DMA32 1:DMA 5:Normal
> [ 1.081376] node[5] zonelist: 5:Normal 1:Normal 1:DMA32 1:DMA

I hope to get to this before I leave for christmas vacation, if not I
will stare into it after then.

Thanks!
--
Michal Hocko
SUSE Labs

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