That's not how it (ZRAM) works. You're holding it wrong.
Though I have to concede that there is much (mostly) wrong documentation about it on the net. On low RAM systems, where such stuff could happen, it may be insufficient to just use it, there is more setup necessary, beginning with https://docs.kernel.org/admin-guide/sysctl/vm.html?highlight... and associated sysctls.
Also tools making use of 'PSI - pressure stall information' are lacking, especially making use of these in an automated and universal way.
Though I have to concede that there is much (mostly) wrong documentation about it on the net. On low RAM systems, where such stuff could happen, it may be insufficient to just use it, there is more setup necessary, beginning with https://docs.kernel.org/admin-guide/sysctl/vm.html?highlight... and associated sysctls.
Also tools making use of 'PSI - pressure stall information' are lacking, especially making use of these in an automated and universal way.