RFR: 8220658: Improve the readability of container information in the error log

Jie Fu fujie at loongson.cn
Thu Mar 14 10:00:08 UTC 2019


Hi all,

Bug:    https://bugs.openjdk.java.net/browse/JDK-8220658
Webrev: http://cr.openjdk.java.net/~jiefu/8220658/webrev.00/

In the VM's error log, the container information was dumpped as:
---------------------------------
container (cgroup) information:
container_type: cgroupv1
cpu_cpuset_cpus: 0-11
cpu_memory_nodes: 0
active_processor_count: 12
cpu_quota: -1
cpu_period: 100000
cpu_shares: -1
memory_limit_in_bytes: -1
memory_and_swap_limit_in_bytes: -2
memory_soft_limit_in_bytes: -1
memory_usage_in_bytes: 11690164224
memory_max_usage_in_bytes: 1806413824
---------------------------------

Items such as "memory_limit_in_bytes" and 
"memory_and_swap_limit_in_bytes" are difficult to understand.

It might be more human-readable if we could dump it like this:
---------------------------------
container (cgroup) information:
container_type: cgroupv1
cpu_cpuset_cpus: 0-11
cpu_memory_nodes: 0
active_processor_count: 12
cpu_quota: no quota
cpu_period: 100000
cpu_shares: no share
memory_limit_in_bytes: unlimited
memory_and_swap_limit_in_bytes: failed
memory_soft_limit_in_bytes: unlimited
memory_usage_in_bytes: 11690164224
memory_max_usage_in_bytes: 1806413824
---------------------------------

I made this patch to improve the readability of container information in 
the error log.
The change has been tested with hotspot:tier1 on Linux/x86-64.

Could you please review it?
Thanks a lot.

Best regards,
Jie




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