docs: upddate docs regarding the changes in youki-dev#2411

Signed-off-by: fengxsong <[email protected]>

docs/src/developer/libcgroups.md

@@ -10,7 +10,7 @@ This crates exposes several functions and modules that can be used to work with
 
   - Trait `CgroupManager`, this abstracts over the underlying implementation of interacting with specific version of cgroups, and gives functions to add certain process to a certain cgroup, apply resource restrictions, get statistics of a cgroups, freeze a cgroup, remove a cgroup or get list of all processes belonging to a cgroup. v1 and v2 modules both contain a version specific cgroup manager which implements this trait, and thus either can be given to functions or structs which expects a cgroup manager, depending on which cgroups the host system uses.
   - Apart from the trait, this also contains functions which help with reading cgroups files, and write data to a cgroup file, which are used throughout this crate.
-  - A function to detect which cgroup setup (v1, v2 or hybrid) is on the host system, as well as a function to get the corresponding cgroups manager.
+  - Functions to detect which cgroup setup (v1, v2 or hybrid) is on the host system with/without specified mounted cgroup root path, as well as functions to get the corresponding cgroups manager w/o cgroup root path.
 
 - Functions and structs to get and store the statistics of a cgroups such as
 
@@ -38,4 +38,4 @@ Note that this implements the minimal required functionality for youki to use db
 - Refer to see [dbus specification](https://dbus.freedesktop.org/doc/dbus-specification.html) and [header format](https://dbus.freedesktop.org/doc/api/html/structDBusHeader.html) for the individual specifications.
 
 - For systemd interface and types, you can generate the following file and take help from the auto-generated functions
-`dbus-codegen-rust -s -g -m None -d org.freedesktop.systemd1 -p /org/freedesktop/systemd1`, see https://github.com/diwic/dbus-rs
+`dbus-codegen-rust -s -g -m None -d org.freedesktop.systemd1 -p /org/freedesktop/systemd1`, see https://github.com/diwic/dbus-rs

docs/src/user/libcgroups.md

@@ -28,7 +28,10 @@ This module contains functionality that is general to any type of cgroup. Some o
 
 - functions `write_cgroup_file_str` and `write_cgroup_file` which write data to a cgroup file
 - function `read_cgroup_file` which reads data from given cgroup file
-- function `get_cgroup_setup` which returns setup of cgroups (v1,v2, hybrid) on the system
+- function `get_cgroup_setup_with_root` which returns setup of cgroups (v1,v2, hybrid) on the system with specified cgroup root path
+- function `get_cgroup_setup` which returns setup of cgroups (v1,v2, hybrid) on the system with default cgroup root path `/sys/fs/cgroup`
+- function `create_cgroup_manager_with_root` which returns corresponding cgroup manager on the system with specified cgroup root path, if the passed `root_path` argument is `None`, then it's same as function `create_cgroup_manager`
+- function `create_cgroup_manager` which returns corresponding cgroup manager on the system with default cgroup root path `/sys/fs/cgroup`
 
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