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#!/bin/bash
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# Author: SharkWipf (https://github.com/SharkWipf)
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#
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# This file depends on the PassthroughPOST hook helper script found here:
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# https://github.com/PassthroughPOST/VFIO-Tools/tree/master/libvirt_hooks
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# This hook only needs to run on `prepare/begin`, not on stop.
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#
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# This hook will help free and compact memory to ease THP allocation.
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# QEMU VMs will use THP (Transparent HugePages) by default if enough
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# unfragmented memory can be found on startup. If your memory is very
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# fragmented, this may cause a slow VM startup (like a slowly responding
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# VM start button/command), and may cause QEMU to fall back to regular
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# memory pages, slowing down VM performance.
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# If you (suspect you) suffer from this, this hook will help ease THP
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# allocation so you don't need to resort to misexplained placebo scripts.
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#
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# Don't use the old hugepages.sh script in this repo. It's useless.
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# It's only kept in for archival reasons and offers no benefits.
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# Finish writing any outstanding writes to disk.
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sync
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# Drop all filesystem caches to free up more memory.
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echo 3 > /proc/sys/vm/drop_caches
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# Do another run of writing any possible new outstanding writes.
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sync
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# Tell the kernel to "defragment" memory where possible.
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echo 1 > /proc/sys/vm/compact_memory
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