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    SubjectRe: [PATCH v4] xen/balloon: add late_initcall_sync() for initial ballooning done
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    On 11/2/21 5:19 AM, Juergen Gross wrote:
    > When running as PVH or HVM guest with actual memory < max memory the
    > hypervisor is using "populate on demand" in order to allow the guest
    > to balloon down from its maximum memory size. For this to work
    > correctly the guest must not touch more memory pages than its target
    > memory size as otherwise the PoD cache will be exhausted and the guest
    > is crashed as a result of that.
    >
    > In extreme cases ballooning down might not be finished today before
    > the init process is started, which can consume lots of memory.
    >
    > In order to avoid random boot crashes in such cases, add a late init
    > call to wait for ballooning down having finished for PVH/HVM guests.
    >
    > Warn on console if initial ballooning fails, panic() after stalling
    > for more than 3 minutes per default. Add a module parameter for
    > changing this timeout.
    >
    > Cc: <stable@vger.kernel.org>
    > Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
    > Signed-off-by: Juergen Gross <jgross@suse.com>



    Applied to for-linus-5-16b.


    -boris

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