** Changed in: linux-azure (Ubuntu Jammy)
Status: New => Fix Committed
** Changed in: linux-azure (Ubuntu Noble)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2114218
Title:
[Arm64] High reboot time for 96 core Linux VMs
Status in linux-azure package in Ubuntu:
Invalid
Status in linux-azure source package in Jammy:
Fix Committed
Status in linux-azure source package in Noble:
Fix Committed
Status in linux-azure source package in Oracular:
Invalid
Status in linux-azure source package in Plucky:
Invalid
Status in linux-azure source package in Questing:
Invalid
Bug description:
SRU Justification
[ Impact ]
* Microsoft request to fix long boot times on arm64 VMs with 96 cores.
[ Fix ]
* Clean cherry-pick of the following patches from upstream:
* 5c63db59c5f8: "arm64: mm: Don't remap pgtables per-cont(pte|pmd) block"
* 1fcb7cea8a5f: "arm64: mm: Batch dsb and isb when populating pgtables"
* 0e9df1c905d8: "arm64: mm: Don't remap pgtables for allocate vs populat"
[ Test Plan ]
* Compile tested
* Microsoft to test further
[ Where problems could occur ]
* Changes made to memory-management, which could have impacts across the
memory subsystems.
* Backport involved stripping out portions of 5-level paging, which was
missing prerequisite
commits. This has been validated, but if logic was not well-separated in
the upstream commits,
the changes for present paging might have some reliance on the 5-level
paging changes.
[ Other info ]
* SF#00412644
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