OOM has trouble to KVM, it can’t shot down the kvm

韦远科

于 2013-05-09 08:30:33 发布

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本文讨论了Linux系统中内存管理的问题，特别是当运行多个虚拟机（VMs）并耗尽所有内存时，Linux如何处理内存不足（OOM）情况。详细介绍了尝试在FC18环境下运行64个使用1GB内存的QEMU-KVM虚拟机时遇到的挑战，以及开启交换分区（swap）的重要性。文章最后强调了在使用QEMU-KVM或OpenStack时开启交换分区的必要性。

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碰到过同样的问题。

http://peter.kingofcoders.com/?p=322

In Linux, if the system is out of memory, OOM will pick one process to kill. But someone reported the OOM can’t kill the qemu-kvm, that mean if you are running many VMs that eat up all the memory, the Linux will hang because OOM can’t kill them

In tried to run 64 VMs using qemu-kvm with 1GB ram each. Without turn on the swap, the linux just hang, i am using FC18 64 bits. If i turn on the swap, the linux will become very slow, but at least it won’t hang.

So turn on the swap is important when you are playing kvm or openstack.

Peter.