Kernel Same-Page Merging

Plugin: proc.plugin Module: /sys/kernel/mm/ksm

Overview

Kernel Samepage Merging (KSM) is a memory-saving feature in Linux that enables the kernel to examine the memory of different processes and identify identical pages. It then merges these identical pages into a single page that the processes share. This is particularly useful for virtualization, where multiple virtual machines might be running the same operating system or applications and have many identical pages.

The collector provides information about the operation and effectiveness of KSM on your system.

This collector is supported on all platforms.

This collector only supports collecting metrics from a single instance of this integration.

Default Behavior

Auto-Detection

This integration doesn't support auto-detection.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Setup

Prerequisites

No action required.

Configuration

Options

There are no configuration options.

via File

There is no configuration file.

Examples

There are no configuration examples.

Alerts

There are no alerts configured by default for this integration.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per Kernel Same-Page Merging instance

This scope has no labels.

Metrics:

Metric	Description	Dimensions	Unit
mem.ksm	Kernel Same Page Merging	shared, unshared, sharing, volatile	MiB
mem.ksm_savings	Kernel Same Page Merging Savings	savings, offered	MiB
mem.ksm_ratios	Kernel Same Page Merging Effectiveness	savings	percentage