KSMCollector
This class collects 'Kernel Samepage Merging' statistics. KSM is a memory de-duplication feature of the Linux Kernel (2.6.32+).
It can be enabled, if compiled into your kernel, by echoing 1 to /sys/kernel/mm/ksm/run. You can find more information about KSM at http://www.linux-kvm.org/page/KSM.
Dependencies
- KSM built into your kernel. It does not have to be enabled, but the stats will be less than useful if it isn't:-)
Options
| Setting | Default | Description | Type |
|---|---|---|---|
| byte_unit | byte | Default numeric output(s) | str |
| enabled | False | Enable collecting these metrics | bool |
| ksm_path | /sys/kernel/mm/ksm | location where KSM kernel data can be found | str |
| measure_collector_time | False | Collect the collector run time in ms | bool |
| metrics_blacklist | None | Regex to match metrics to block. Mutually exclusive with metrics_whitelist | NoneType |
| metrics_whitelist | None | Regex to match metrics to transmit. Mutually exclusive with metrics_blacklist | NoneType |
Example Output
servers.hostname.ksm.full_scans 123.0
servers.hostname.ksm.pages_shared 124.0
servers.hostname.ksm.pages_sharing 125.0
servers.hostname.ksm.pages_to_scan 100.0
servers.hostname.ksm.pages_unshared 126.0
servers.hostname.ksm.pages_volatile 127.0
servers.hostname.ksm.run 1.0
servers.hostname.ksm.sleep_millisecs 20.0