Re: [PATCH RFC 0/5] powerpc:numa Add serial nid support
From: Raghavendra K T
Date: Tue Sep 29 2015 - 15:10:41 EST
On 09/28/2015 11:04 PM, Nishanth Aravamudan wrote:
On 27.09.2015 [23:59:08 +0530], Raghavendra K T wrote:
2) Map the sparse chipid got from device tree to a serial nid at kernel
level (The idea proposed in this series).
Pro: It is more natural to handle at kernel level than at lower (OPAL) layer.
con: The chipid is in device tree no longer the same as nid in kernel
Is there any debugging/logging? Looks like not -- so how does a sysadmin
map from firmware-provided values to the Linux values? That's going to
make debugging of large systems (PowerVM or otherwise) less than
pleasant, it seems? Possibly you could put something in sysfs?
I see 2 things could be done here:
1) while doing dump_numa_cpu_topology() we can dump nid_to_chipid()
as additional information.
Does /sys/devices/system/node/nodeX/*chipid* looks good. May be we
should add only for powerpc or otherwise we need to have chipid = nid
populated for other archs. [ I think this change may be done slowly ]
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