[$] The problem of unnecessary readahead

The final session in the memory-management track of the 2025 Linux Storage,Filesystem, Memory-Management, and BPF Summit was a brief, last-minuteaddition run by Kalesh Singh. The kernel's readahead mechanism isgenerally good for performance; it ensures that data is present by the timean application gets around to asking for it. Sometimes, though, readaheadcan go a little too far.