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Backport #84 to 6.18-lts: xen/balloon: let the OOM notifier grow an empty domU balloon - #85
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Since a6aa4eb ("xen/x86: add extra pages to unpopulated-alloc if available"), a domU built below its maximum hands the rest of its physmap to the unpopulated allocator at boot, so its balloon stays empty until the toolstack first resizes it. balloon_oom_notify() only deflates pages already on the balloon, so a freshly built domU kills a task instead of growing toward its maximum. When the balloon is empty, park one 2 MiB block from the unpopulated allocator on it and deflate that, as dom0's balloon does when it grows. The allocator allocates memory with its lock held, so the OOM path only tries the lock, through a new xen_try_alloc_unpopulated_blocks(). Signed-off-by: Kavi <kavi@edera.dev> (cherry picked from commit ba4e76a)
This was referenced Nov 4, 2026
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Backport of #84 from
edera/mainlinetoedera/6.18-lts(8a4c2881a70c), prepared by Claude. Run log.Merge with Rebase and merge, so
edera/6.18-ltsstays linear.Independent checks
Builds: success (x86_64 and arm64 vmlinux with the Edera features built in).
8a4c2881a70c077dbcddc0cfClaude's report
Claude left no report (backport step: success).