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SubjectRe: [PATCH v5 1/2] xenbus/backend: Add memory pressure handler callback
On 10.12.19 09:06, SeongJae Park wrote:
> Granting pages consumes backend system memory. In systems configured
> with insufficient spare memory for those pages, it can cause a memory
> pressure situation. However, finding the optimal amount of the spare
> memory is challenging for large systems having dynamic resource
> utilization patterns. Also, such a static configuration might lack a
> flexibility.
> To mitigate such problems, this commit adds a memory reclaim callback to
> 'xenbus_driver'. Using this facility, 'xenbus' would be able to monitor
> a memory pressure and request specific devices of specific backend
> drivers which causing the given pressure to voluntarily release its
> memory.
> That said, this commit simply requests every callback registered driver
> to release its memory for every domain, rather than issueing the
> requests to the drivers and the domain in charge. Such things will be
> done in a futur. Also, this commit focuses on memory only. However, it
> would be ablt to be extended for general resources.
> Signed-off-by: SeongJae Park <>

Reviewed-by: Juergen Gross <>


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