[CentOS] memory cgroup max_usage_in_bytes question

Stijn De Weirdt
2018-04-05T06:55:14Z

hi mark,

>> can someone help explaining what we are seeing? it makes no sense to
us.
>> this is a host running centos 7.4 with 3.10.0-693.17.1 kernel, and it
>> has 192GB of ram
>>
>>> [] free -b
>>>               total        used        free      shared  buff/cache
>>> available
>>> Mem:    201402642432 14413479936 75642777600    48586752
111346384896
>>> 185689632768
>>> Swap:   21474832384    31961088 21442871296
>>> [] cat /sys/fs/cgroup/memory/memory.max_usage_in_bytes
>>> 273102151680
>>
>> how can the max be so much higher than total, and this is not even
memsw?
>>
>> either we're very tired and are overlooking something obvious, or
>> there's something new to be learned ;)
>>
> Wonder if it's overcommitting memory.VMs do that, as a matter of
course.
should have mentioned this, but this is not a VM.
also, i expect any overcommit related numbers to show up in the memsw
counters

stijn

>
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