How to use the slabtop command in Linux
Editor to share with you how to use the slabtop command in Linux. I hope you will get something after reading this article. Let's discuss it together.
The Linux common command slabtop command displays the details of the kernel "slab" buffer in real time.
Syntax: slabtop (option) option:-- delay=n,-d n: update the displayed information every n seconds. Default is 3 seconds-- sort=S,-s S: specify sorting criteria for sorting (sorting criteria) Refer to the following or man manual)-- once,-o: show once and then exit the instance sorting criteria: a: sort by number of active objects b: sort by objects per slab c: sort by cache size l: sort by number of slabs v: sort by number of active slabs n: sort by name o: sort by number of objects p: sort by pages per slabs: sort by object size u: sort by cache utilization knowledge extension: kernel modules when allocating resources In order to improve efficiency and resource utilization, it is allocated through slab. Through the information of slab, combined with the source code, we can roughly understand the operation of the system, such as what resources are abnormal, or what resources are leaked. The linux system exposes slab usage to users through / proc/slabinfo.
The slab allocator used by Linux is based on an algorithm first introduced by Jeff Bonwick for the SunOS operating system. The allocator of Jeff revolves around the object cache. In the kernel, a large amount of memory is allocated for a limited set of objects, such as file descriptors and other common structures. Jeff found that initializing normal objects in the kernel takes longer than it takes to allocate and release them. Therefore, he concluded that memory should not be released back to a global memory pool, but should be kept in a state initialized for a specific purpose. The Linux slab allocator uses this and other ideas to build a memory allocator that is efficient in both space and time.
The file that holds information about all active slab caches in the monitoring system is / proc/slabinfo.
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