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SLAB is a cache mechanism used by the Kernel to avoid fragmentation.

Each internal structure (process, file descriptor, inode...) is stored within a SLAB.

configuring Netdata for slabinfo#

The plugin is disabled by default because it collects and displays a huge amount of metrics. To enable it set slabinfo = yes in the plugins section of the netdata.conf configuration file.

There is currently no configuration needed for the plugin itself.

As /proc/slabinfo is only readable by root, this plugin is setuid root.

For what use#

This slabinfo details allows to have clues on actions done on your system. In the following screenshot, you can clearly see a find done on a ext4 filesystem (the number of ext4_inode_cache & dentry are rising fast), and a few seconds later, an admin issued a echo 3 > /proc/sys/vm/drop_cached as their count dropped.


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