17.06.2023 08:36, Bin Meng wrote:
Current codes using a brute-force traversal of all file descriptors do not scale on a system where the maximum number of file descriptors is set to a very large value (e.g.: in a Docker container of Manjaro distribution it is set to 1073741816). QEMU just looks frozen during start-up.
What's the reason to close all these file descriptors in the first place? No other software I know does this. For some situations, such closing is actually bad, -- think, eg, flock lockfile qemu-system-foo ... -- this one opens a file, locks it using fcntl/flock, and executes the command, keeping the file descriptor open across exec, so the file stays locked until the process terminates. This works and works well. Qemu with its let's-close-everything approach breaks this. Why? :) /mjt
