Patent · US Active

Efficient reclamation of pre-allocated direct memory access (DMA) memory

US10289563B2 · kind B2 · utility

0Cited by

6References

18Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Shay H. Akirav · Nes Ziona, IL
Oren Bar · Nes Ziona, IL
Roman Barsky · Nes Ziona, IL
Itay Maoz · Haifa, IL

Key dates

Filing date	Jan 17, 2017
Grant date	May 14, 2019
Priority date	—
Expiry date	Jul 5, 2037

Classification

Technology area (CPC G)Physics
CPC primaryG06F9/4401
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

For efficient reclamation of pre-allocated direct memory access (DMA) memory in a computing environment, hot-add random access memory (RAM) is emulated for a general purpose use by reclamation of pre-allocated DMA memory reserved at boot time by notifying a non-kernel use device user that the non-kernel use device has a smaller window, stopping and remapping to the smaller window, and notifying a kernel that new memory has been added, wherein the new memory is a region left after the remap. The hot-add RAM is split into at least two continuous parts.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.