On Wed, Dec 11, 2019 at 06:10:14PM +0000, 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 > flexibility. > > To mitigate such problems, this commit adds a memory reclaim callback to > 'xenbus_driver'. If a memory pressure is detected, 'xenbus' requests > every backend driver to volunarily release its memory. > > Note that it would be able to improve the callback facility for more > sophisticated handlings of general pressures. For example, it would be > possible to monitor the memory consumption of each device and issue the > release requests to only devices which causing the pressure. Also, the > callback could be extended to handle not only memory, but general > resources. Nevertheless, this version of the implementation defers such > sophisticated goals as a future work. > > Reviewed-by: Juergen Gross <jgross@xxxxxxxx> > Signed-off-by: SeongJae Park <sjpark@xxxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Thanks, Roger.
