Conversation

OS communication primitive idea: "inverse mmap" an application creates a file where pages are backed by the application itself, i.e. when someone tries to access that file, a trap gives the application an opportunity to fill in whatever page is being accessed

107

Daniel Micay

@DanielMicay

Replying to

@whitequark

Linux supports userfaultfd for shared memory and hugetlbfs since Linux 4.11, which seems like a fairly close match to this functionality.

2:39 PM · May 4, 2019Twitter Web Client

Replying to

close but I really want to handle page faults for another process

Replying to

I thought it did work that way, by pausing threads triggering user faults and handling them in another thread. I might be wrong, but my understanding is that it would work the same way across processes, so that you could handle a fault triggered in one process in the other one.

Show replies