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Reverse migration is used to do the balancing the occupancy of memory zones in a node in the system whose imabalance may be caused by migration of pages to other zones by an operation, eg: hotremove and then hotadding the same memory. In this case there is a lot of free memory in newly hotadd memory which can be filled up by the previous migrated pages(as part of offline/hotremove) thus may free up some pressure in other zones of the node. Upstream discussion: https://lore.kernel.org/patchwork/cover/1382106/ Change-Id: Ib3137dab0db66ecf6858c4077dcadb9dfd0c6b1c Bug: 175403896 Signed-off-by: Charan Teja Reddy <charante@codeaurora.org> |
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