> Cong> This is a draft patch of implementing per-file drop caches.
Interesting. So can I do this from outside a process? I'm a
SysAdmin, so my POV is from noticing, finding and fixing performance
problems when the system is under pressure.
Cong> It introduces a new fcntl command F_DROP_CACHES to drop
Cong> file caches of a specific file. The reason is that currently
Cong> we only have a system-wide drop caches interface, it could
Cong> cause system-wide performance down if we drop all page caches