持続性キャッシュフラッシュのためのシステムサポート

Abstract

Described herein are techniques for flushing volatile system memory to persistent memory after loss of alternating current (AC) power. In some embodiments, these techniques include implementing a hold-up window that is extended long enough to fully flush processor caches and memory controller buffers using available energy in one or more power supplies' bulk capacitors after a power outage event. The voltage of one or more power supply units' internal bulk capacitors may be monitored, and a notification may be triggered when a programmable threshold voltage is sensed in the bulk capacitor. The system may configure a voltage threshold to indicate that a certain minimum amount of energy is available to be used to successfully complete a cache flush operation. These techniques allow for flushing volatile system caches without relying on cumbersome to install and maintain battery backup units (BBUs).

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