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<think>
Okay, so I need to classify this bug report into one of the given categories. The title is about enabling postcopy migration for mixed Hugepage backed KVM guests and improving dirty-page tracking in QEMU/KVM.
First, let me break down what's mentioned here. "KVM" is explicitly stated, which is a hypervisor. Postcopy migration relates to how virtual machines are moved between physical hosts during live migration. This process requires handling memory efficiently, especially when dealing with hugepages, which are large memory pages used for performance optimization.
The bug report also mentions improving dirty-page tracking. Dirty pages are those that have been modified by the guest OS and need to be copied during migration. Handling this correctly is crucial for efficient migrations and preventing data loss or corruption.
Looking at the categories provided: hypervisor seems like the most fitting because KVM is a hypervisor, and the issue relates directly to its functionality in handling VM migrations and memory tracking. Other categories like "network" might be related, but the focus here is more on the hypervisor's role rather than network transmission specifics.
Therefore, the category should be "hypervisor."
</think>
hypervisor
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