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Re: [Xen-devel] [PATCH] xen: release lock occasionally during ballooning

On 10/07/15 15:42, Juergen Gross wrote:
> When dom0 is being ballooned balloon_process() will hold the balloon
> mutex until it is finished. This will block e.g. creation of new
> domains as the device backends for the new domain need some
> autoballooned pages for the ring buffers.
> Avoid this by releasing the balloon mutex from time to time during
> ballooning. Add a state variable to indicate one balloon_process()
> is active to avoid multiple balloon processes fighting for the mutex.

Is this state variable necessary? balloon_process() is a work item so
there should only be one instance of it running anyway, yes?


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