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...such as oVirt's "mom" app (Memory Overcommit Manager). > Do you have any procedure, how it can be tested? Or there is any log > where I can see that the memory ballooning is started to work? So the out of the box behaviour if you have host memory pressure is that QEMU will get pushued out to swap. You need to make sure you have enough swap to cope with the worst case memory load on the host to avoid risk of the OOM Killer waking up. Finally note that QEMU's default behaviour will not make guest RAM resident when it starts up. A guest with 32 GB of RAM configured may only us...

...h as oVirt's "mom" app (Memory Overcommit Manager). > Do you have any procedure, how it can be tested? Or there is any log > where I can see that the memory ballooning is started to work? So the out of the box behaviour if you have host memory pressure is that QEMU will get pushued out to swap. You need to make sure you have enough swap to cope with the worst case memory load on the host to avoid risk of the OOM Killer waking up. Finally note that QEMU's default behaviour will not make guest RAM resident when it starts up. A guest with 32 GB of RAM configured may onl...