Recursive COW Pages in Userspace

In plain words

Recursive COW Pages in Userspace is a technical tool for managing memory efficiency in computing systems. It implements copy-on-write page handling at the userspace level, allowing developers to work with memory management more granularly. The software is designed for programmers and systems engineers who need advanced memory optimization capabilities. It launched in July 2023 and is available through wheybags.com.

written from the facts on this page · September 2026

From the sources

One fine evening, I was walking home after work when I was struck by an idea. It was one of those ideas which, once it lodges itself in my brain, simply refuses to leave until my curiosity has been satisfied. This is that idea: You could use SIGSEGV to implement COW memory pages in userspace. COW stands for Copy On Write. Modern OSes will give you "pages" of memory (chunks of a predefined size) when you ask them to allocate space for your data. Unix-like OSes famously use copy on write pages to implement fork(2) . The process is cloned when you call fork, so naturally you'd need to copy all the memory that program is using into the clone right? Well, that would be fantastically wasteful.…from wheybags.com

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