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config-linux: mark memory.kernel[TCP] as NOT RECOMMENDED

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Per-cgroup kernel memory accounting (and explicit limiting) is
problematic in the Linux kernel for too many reasons to quote here.
Besides, cgroup v2 does not even have a kernel memory limit knob,
and the one in cgroup v1 is made obsoleted in kernel v5.4 [1].

Mark memory.kernel and memory.kernelTCP as NOT RECOMMENDED, in additon
to OPTIONAL. This is a way to say "we do not anyone (runtimes or users)
to set those limits, unless they have good understanding and strong
reasons to do so".

[1] https://github.com/torvalds/linux/commit/0158115f702b0ba208ab0b

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin
2021-03-08 10:41:59 -08:00
parent 43e4633e40
commit f02cd4a427
1 changed files with 2 additions and 2 deletions
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config-linux.md
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@@ -264,8 +264,8 @@ Values for memory specify the limit in bytes, or `-1` for unlimited memory.
* **`limit`** *(int64, OPTIONAL)* - sets limit of memory usage
* **`reservation`** *(int64, OPTIONAL)* - sets soft limit of memory usage
* **`swap`** *(int64, OPTIONAL)* - sets limit of memory+Swap usage
* **`kernel`** *(int64, OPTIONAL)* - sets hard limit for kernel memory
* **`kernelTCP`** *(int64, OPTIONAL)* - sets hard limit for kernel TCP buffer memory
* **`kernel`** *(int64, OPTIONAL, NOT RECOMMENDED)* - sets hard limit for kernel memory
* **`kernelTCP`** *(int64, OPTIONAL, NOT RECOMMENDED)* - sets hard limit for kernel TCP buffer memory
The following properties do not specify memory limits, but are covered by the `memory` controller: