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cgroup: Add more precise footnotes.

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tastytea 2021-07-22 00:04:36 +02:00
parent fa77f6868c
commit 0be2de3cf8
Signed by: tastytea
GPG Key ID: CFC39497F1B26E07
1 changed files with 15 additions and 9 deletions
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content/posts/cgroup v2 by hand.adoc
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@ -82,9 +82,10 @@ We will keep it simple by only setting controllers globally in our root cgroup.
== Controlling CPU usage
This control group will use the cpu controllerfootnote:controllers[]. Every
process in this group will be deprioritized, all processes together can only use
the power of 2 CPU cores.
This control group will use the cpu
controllerfootnote:[link:{url-kernel-doc}#cpu[Kernel documentation on Control
Group v2, section Controllers → CPU]]. Every process in this group will be
deprioritized, all processes together can only use the power of 2 CPU cores.
[source,shell]
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@ -126,8 +127,10 @@ values used by link:{url-nice}[nice] and has a range from -20 to 19.
=== Controlling CPU core usage
This control group will use the cpuset controller to restrict the processes to
the CPU cores 0 and 3.
This control group will use the cpuset
controllerfootnote:[link:{url-kernel-doc}#cpuset[Kernel documentation on Control
Group v2, section Controllers → Cpuset]] to restrict the processes to the CPU
cores 0 and 3.
[source,shell]
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@ -148,8 +151,9 @@ kbd:[Enter].
== Controlling memory usage
This control group will use the memory controllerfootnote:controllers[]. All
processes together can only use 1
This control group will use the memory
controllerfootnote:[link:{url-kernel-doc}#memory[Kernel documentation on Control
Group v2, section Controllers → Memory]]. All processes together can only use 1
pass:[<abbr title="Gibibyte, 1024 Mebibyte">GiB</abbr>] of memory at most.
[source,shell]
@ -173,7 +177,8 @@ echo "$$" > cgroup.procs
This control group will increase the IO priority and limit the write speed to 2
pass:[<abbr title="Mebibyte, 1024 Kibibyte">MiB</abbr>] a second using the io
controllerfootnote:controllers[]. IO limits are set per device. You need to
controllerfootnote:[link:{url-kernel-doc}#io[Kernel documentation on Control
Group v2, section Controllers → IO]]. IO limits are set per device. You need to
specify the major and minor device numbers of the _device_ (not partition) you
want to limit (in my case it is “8:0” for `/dev/sda`). Run `lsblk` or `cat
/proc/partitions` to find them out.
@ -209,7 +214,8 @@ yet, since I run kernel 5.10.
== Controlling process numbers
This control group will limit the amount of processes to 10 using the process
number controllerfootnote:controllers[].
number controllerfootnote:[link:{url-kernel-doc}#pid[Kernel documentation on
Control Group v2, section Controllers → PID]].
[source,shell]
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