ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,481,528, issued on Nov. 25, was assigned to International Business Machines Corp. (Armonk, N.Y.).

"Hybrid virtual thread context switching mechanism" was invented by Oluwatobi Ajila (Ottawa), Siwei Lu (Ottawa) and Graham Alan Chapman (Nepean, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "Hybrid virtual thread context switching in virtual machines is provided. For virtual threads scheduled to run on a VM, it is determined whether a virtual thread requires a stack. If a stack is required, it is determined whether low memory has space to allocate a stack. If there is space, a stack in low memory is allocated. If not, unused stacks are copied from l...