Adding upstream version 1.37.1.upstream/1.37.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 29 insertions, 0 deletions

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+<!--
+title: "slabinfo.plugin"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/slabinfo.plugin/README.md
+-->
+
+# slabinfo.plugin
+
+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.
+
+![netdata_slabinfo](https://user-images.githubusercontent.com/9157986/64433811-7f06e500-d0bf-11e9-8e1e-087497e61033.png)
+
+
+