Hello, Linus. On Sat, Jan 05, 2019 at 01:54:03PM -0800, Linus Torvalds wrote: > And the first hit is 'fincore', which probably nobody cares about > anyway, but it does > > fd = open (name, O_RDONLY) > .. > mmap(window, len, PROT_NONE, MAP_PRIVATE, .. So, folks here have been using fincore(1) for diagnostic purposes and are also looking to expand on it to investigate per-cgroup cache usages (mmap -> mincore -> /proc/self/pagemap -> /proc/kpagecgroup -> cgroup path). These are all root-only usages to find out what's going on with the whole page cache. We aren't attached to doing things this particular way but it'd suck if there's no way. Thanks. -- tejun
