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---Problem Description---
Hugepages memory is not getting released even after destroying the guest
Machine Type = P10 Denali LPAR
---uname output---
Linux ubuntu2404lp3 6.8.0-22-generic #22-Ubuntu SMP Thu Apr 4 22:47:57 UTC
2024 ppc64le ppc64le ppc64le GNU/Linux
---Steps to Reproduce---
1. Create a guest which is backed by hugepages.
2. Destroy the guest
3. execute "free -h" or "cat /proc/meminfo" to see that Hugepage memory is
still getting held.
HugePages_Total: 20480
HugePages_Free: 20419
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 41943040 kB
DirectMap4k: 0 kB
DirectMap64k: 52428800 kB
DirectMap2M: 0 kB
DirectMap1G: 0 kB
root@ubuntu2404lp3:~# virsh list --all
Id Name State
---------------------------
- ramlp2g1 shut off
- ramlp2g2 shut off
- ramlp2g3 shut off
- ramlp3g3 shut off
root@ubuntu2404lp3:~# free -h
total used free shared buff/cache available
Mem: 48Gi 43Gi 4.6Gi 2.6Mi 277Mi 4.6Gi
Swap: 8.0Gi 243Mi 7.8Gi
root@ubuntu2404lp3:~#
====
This is an issue created by commit 1b151e2435fc ("block: Remove special-casing
of compound pages") that moved the direct-io hugetlb handling from compound
pages to folios.
Following commit has been proposed and merged into 6.9-rc1 which fixes this
issue.
38b43539d64b2fa020b3b9a752a986769f87f7a6("block: Fix page refcounts for
unaligned buffers in __bio_release_pages()")
So the same needs to be backported to the Ubuntu24.04 kernel as well.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-206058 severity-high
targetmilestone-inin2404
--
[Ubuntu-24.04] Hugepage memory is not getting released even after destroying
the guest!
https://bugs.launchpad.net/bugs/2062556
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