c - Is there any efficient way get the left physical memory in docker? -


my app program wants read free avail physical memory in docker.

currently，which means can think of, reading 2 values memory.limit_in_bytes , memory.usage_in_bytes 'cgroup' file in docker, figuring them out 

free_memory = value memory.limit_in_bytes - memory.usage_in_bytes

but slow.

is there efficient way free physical memory?

my app focuses on performance much.


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