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* cpu: Support processor-less (memory-only) NUMA nodes (#734) * cpu: Support processor-less (memory-only) NUMA nodes Processor-less (memory-only) NUMA nodes exist e.g. in systems that use Intel Optane drives for RAM expansion using Intel Memory Drive Technology (IMDT). IMDT RAM expansion supports two modes: * "Unify Remote Memory domains": present a processor-less (memory-only) NUMA domain, which is the default * "Expand local memory domains": to expand each processor’s memory domain with a portion of the memory made available by Optane and IMDT This commit fixes a crash in the first case (when "cpulist" is empty). Here's an example of such a system: $ numastat -m|head -n5 Per-node system memory usage (in MBs): Node 0 Node 1 Node 2 Total --------------- --------------- --------------- --------------- MemTotal 118239.56 130816.00 464384.00 713439.56 $ for i in {0..2}; do echo -n "$i: " ; cat /sys/bus/node/devices/node$i/cpulist ; done 0: 0-7,16-23 1: 8-15,24-31 2: $ /opt/vsmp/bin/vsmpversion -vvv Memory Drive Technology: 8.2.1455.74 (Sep 28 2017 13:09:59) System configuration: Boards: 3 1 x Proc. + I/O + Memory 2 x NVM devices (Intel SSDPED1K375GAQ) Processors: 2, Cores: 16, Threads: 32 Intel(R) Xeon(R) CPU E5-2667 v4 @ 3.20GHz Stepping 01 Memory (MB): 713472 (of 977450), Cache: 251416, Private: 12562 1 x 249088MB [262036/ 678/12270] 1 x 232192MB [357707/125369/ 146] 82:00.0#1 1 x 232192MB [357707/125369/ 146] 83:00.0#1 * cpu: rename some variables (pkg => node) * cpu: Use %v not %q in log.Debugf() format strings * Release v0.15.2
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0.15.2
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