You can troubleshoot memory issues on the ESXi host with the esxtop commando. Then press "m" for memory. then you will see the active memory from the VM's on the ESXi host.
If you perform this look at the counters at the left. This will represent the values for TPS, memctl, zip and swap.
This due the fact that if the host is using memory reclamation technique the state is fairly not changing.
 |
| esxtop + m |
