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cgroup: Restrict effective limits with global resource provision

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Global resource (whole system or root cg's (e.g. in a container)) is
also a well-defined limit for memory and tasks, take it into account
when calculating effective limits.
This commit is contained in:
Michal Koutný 2023-08-14 19:59:57 +02:00
parent ce35bb95c7
commit 93f8e88d23
2 changed files with 12 additions and 1 deletions
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2
man/systemd.resource-control.xml
View file

@ -438,7 +438,7 @@ CPUWeight=20 DisableControllers=cpu / \
<literal>memory.max</literal> control group attribute. For details about this control group attribute, see
<ulink url="https://docs.kernel.org/admin-guide/cgroup-v2.html#memory-interface-files">Memory Interface Files</ulink>.
The effective configuration is reported as <varname>EffectiveMemoryMax=</varname> (the value is
the most stringent limit of the unit and parent slices).</para>
the most stringent limit of the unit and parent slices and it is capped by physical memory).</para>
<para>While <varname>StartupMemoryMax=</varname> applies to the startup and shutdown phases of the system,
<varname>MemoryMax=</varname> applies to normal runtime of the system, and if the former is not set also to

11
src/core/cgroup.c
View file

@ -4253,6 +4253,17 @@ static uint64_t unit_get_effective_limit_one(Unit *u, CGroupLimitType type) {
assert(u);
assert(UNIT_HAS_CGROUP_CONTEXT(u));
if (unit_has_name(u, SPECIAL_ROOT_SLICE))
switch (type) {
case CGROUP_LIMIT_MEMORY_MAX:
case CGROUP_LIMIT_MEMORY_HIGH:
return physical_memory();
case CGROUP_LIMIT_TASKS_MAX:
return system_tasks_max();
default:
assert_not_reached();
}
cc = unit_get_cgroup_context(u);
switch (type) {
/* Note: on legacy/hybrid hierarchies memory_max stays CGROUP_LIMIT_MAX unless configured