Messages in this thread | | | Subject | Re: [PATCH v5 1/2] xenbus/backend: Add memory pressure handler callback | From | Jürgen Groß <> | Date | Tue, 10 Dec 2019 09:17:38 +0100 |
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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 <sjpark@amazon.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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