2024-02-23 17:24:26 +01:00
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From 355275a7708d09f7be27ea239478cb3c6defbb9a Mon Sep 17 00:00:00 2001
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2024-01-23 14:52:53 +01:00
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From: =?UTF-8?q?Michal=20Koutn=C3=BD?= <mkoutny@suse.com>
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2024-02-23 17:24:26 +01:00
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Date: Mon, 14 Aug 2023 19:59:57 +0200
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Subject: [PATCH 5009/5010] cgroup: Restrict effective limits with global
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2024-01-23 14:52:53 +01:00
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resource provision
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Global resource (whole system or root cg's (e.g. in a container)) is
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also a well-defined limit for memory and tasks, take it into account
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when calculating effective limits.
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(cherry picked from commit 93f8e88d23bd383b5134f32c1e2ee315ac3a38c8)
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[mkoutny: fixes jsc#PED-5659]
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---
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man/systemd.resource-control.xml | 2 +-
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src/core/cgroup.c | 11 +++++++++++
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2 files changed, 12 insertions(+), 1 deletion(-)
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diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
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index bd8b6a5719..c2aa5b57e8 100644
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--- a/man/systemd.resource-control.xml
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+++ b/man/systemd.resource-control.xml
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2024-02-23 17:24:26 +01:00
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@@ -438,7 +438,7 @@ CPUWeight=20 DisableControllers=cpu / \
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2024-01-23 14:52:53 +01:00
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<literal>memory.max</literal> control group attribute. For details about this control group attribute, see
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<ulink url="https://docs.kernel.org/admin-guide/cgroup-v2.html#memory-interface-files">Memory Interface Files</ulink>.
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The effective configuration is reported as <varname>EffectiveMemoryMax=</varname> (the value is
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- the most stringent limit of the unit and parent slices).</para>
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+ the most stringent limit of the unit and parent slices and it is capped by physical memory).</para>
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<para>While <varname>StartupMemoryMax=</varname> applies to the startup and shutdown phases of the system,
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<varname>MemoryMax=</varname> applies to normal runtime of the system, and if the former is not set also to
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diff --git a/src/core/cgroup.c b/src/core/cgroup.c
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2024-02-23 17:24:26 +01:00
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index 78ca67216a..285fa200d6 100644
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2024-01-23 14:52:53 +01:00
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--- a/src/core/cgroup.c
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+++ b/src/core/cgroup.c
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2024-02-23 17:24:26 +01:00
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@@ -4249,6 +4249,17 @@ static uint64_t unit_get_effective_limit_one(Unit *u, CGroupLimitType type) {
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2024-01-23 14:52:53 +01:00
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assert(u);
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assert(UNIT_HAS_CGROUP_CONTEXT(u));
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+ if (unit_has_name(u, SPECIAL_ROOT_SLICE))
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+ switch (type) {
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+ case CGROUP_LIMIT_MEMORY_MAX:
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+ case CGROUP_LIMIT_MEMORY_HIGH:
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+ return physical_memory();
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+ case CGROUP_LIMIT_TASKS_MAX:
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+ return system_tasks_max();
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+ default:
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+ assert_not_reached();
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+ }
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+
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cc = unit_get_cgroup_context(u);
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switch (type) {
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/* Note: on legacy/hybrid hierarchies memory_max stays CGROUP_LIMIT_MAX unless configured
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--
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2.35.3
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