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In-memory computing inspires us to integrate large-capacity persistent memory into main memory subsystem. However, it remains a challenge to build an integrated memory system on existing kernel because (1) inappropriate integration readily leads to the inconsistencies between the allocation and reclamation of DRAM and those of the persistent memory, (2) the kernel is difficult to transparently trigger an integrating process appropriately, and (3) page descriptors may occupy huge metadata space when the introduced capacity reaches a granularity of terabyte. To address these problems, we present a system architecture to manage the integrated persistent memory space and available DRAM space in a unified manner, and propose an adaptive mechanism that can automatically introduce persistent memory by assessing the degree of memory pressure. We only integrate a moderate amount of persistent memory space into system to refrain from expanding kernel metadata instantaneously. To illustrate the effectiveness of proposed scheme, we design and implement a prototype as a kernel module in Linux.
syswonder.org source code
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