On Fri, May 03, 2024 at 05:30:01PM -0700, Andrii Nakryiko wrote: > Implement binary ioctl()-based interface to /proc/<pid>/maps file to allow > applications to query VMA information more efficiently than through textual > processing of /proc/<pid>/maps contents. See patch #2 for the context, > justification, and nuances of the API design. > > Patch #1 is a refactoring to keep VMA name logic determination in one place. > Patch #2 is the meat of kernel-side API. > Patch #3 just syncs UAPI header (linux/fs.h) into tools/include. > Patch #4 adjusts BPF selftests logic that currently parses /proc/<pid>/maps to > optionally use this new ioctl()-based API, if supported. > Patch #5 implements a simple C tool to demonstrate intended efficient use (for > both textual and binary interfaces) and allows benchmarking them. Patch itself > also has performance numbers of a test based on one of the medium-sized > internal applications taken from production. I don't have anything against adding a binary interface for this. But it's somewhat odd to do ioctls based on /proc files. I wonder if there isn't a more suitable place for this. prctl()? New vmstat() system call using a pidfd/pid as reference? ioctl() on fs/pidfs.c?
