Description in /etc/sysconfig/zram is wrong

[mohag]

The script sets the disksize value, which is the size of the zram block device, not the amount of memory used (which is allocated dynamically). The memory can be limited by the mem_limit parameter. (Setting Factor to even 200 won't cause OOM, unless lots of hard to compress data is written to the zram device) (mem_limit can prevent that, but is not supported on some older kernels (Like CentOS7's 3.10))

See https://www.kernel.org/doc/Documentation/blockdev/zram.txt