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collectors KSMCollector

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Rob Smith edited this page Sep 16, 2014 · 11 revisions

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 - Generic 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

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