vmtouch like util to show per cgroup per file Page Cache stats.
Show total stats:
$ sudo go run ./main.go /var/tmp/ Files: 2
Directories: 7
Resident Pages: 46182/74343 180.4M/290.4M 62.1%
cgroup inode percent pages path
- 37.9% 28161 not charged
1781 6.2% 4608 /sys/fs/cgroup/user.slice/user-1000.slice/session-3.scope
1717 55.9% 41574 /sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice
Show full per file per cgroup stats:
$ sudo go run ./main.go /var/tmp/ -v/var/tmp/file1.db
cgroup inode percent pages path
- 85.9% 28161 not charged
1781 14.1% 4608 /sys/fs/cgroup/user.slice/user-1000.slice/session-3.scope
--
/var/tmp/ubuntu-21.04-live-server-amd64.iso
cgroup inode percent pages pat
- 0.0% 0 not charged
2453 100.0% 38032 /sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/run-u10.service
--
Files: 2
Directories: 7
Resident Pages: 42640/70801 166.6M/276.6M 60.2%
cgroup inode percent pages path
- 39.8% 28161 not charged
1781 6.5% 4608 /sys/fs/cgroup/user.slice/user-1000.slice/session-3.scope
2453 53.7% 38032 /sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/run-u10.service
Uses pagemap and kpagecgroup https://www.kernel.org/doc/Documentation/vm/pagemap.txt