From: Vipin Sharma <vipinsh@google.com>
To: tj@kernel.org, mkoutny@suse.com, rdunlap@infradead.org,
thomas.lendacky@amd.com, brijesh.singh@amd.com,
jon.grimm@amd.com, eric.vantassell@amd.com, pbonzini@redhat.com,
hannes@cmpxchg.org, frankja@linux.ibm.com,
borntraeger@de.ibm.com
Cc: corbet@lwn.net, seanjc@google.com, vkuznets@redhat.com,
wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
hpa@zytor.com, gingell@google.com, rientjes@google.com,
dionnaglaze@google.com, kvm@vger.kernel.org, x86@kernel.org,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Vipin Sharma <vipinsh@google.com>
Subject: [RFC v2 2/2] cgroup: sev: Miscellaneous cgroup documentation.
Date: Tue, 2 Mar 2021 00:17:05 -0800 [thread overview]
Message-ID: <20210302081705.1990283-3-vipinsh@google.com> (raw)
In-Reply-To: <20210302081705.1990283-1-vipinsh@google.com>
Documentation of miscellaneous cgroup controller. This new controller is
used to track and limit the usage of scalar resources.
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: David Rientjes <rientjes@google.com>
---
Documentation/admin-guide/cgroup-v1/index.rst | 1 +
Documentation/admin-guide/cgroup-v1/misc.rst | 4 ++
Documentation/admin-guide/cgroup-v2.rst | 69 ++++++++++++++++++-
3 files changed, 72 insertions(+), 2 deletions(-)
create mode 100644 Documentation/admin-guide/cgroup-v1/misc.rst
diff --git a/Documentation/admin-guide/cgroup-v1/index.rst b/Documentation/admin-guide/cgroup-v1/index.rst
index 226f64473e8e..99fbc8a64ba9 100644
--- a/Documentation/admin-guide/cgroup-v1/index.rst
+++ b/Documentation/admin-guide/cgroup-v1/index.rst
@@ -17,6 +17,7 @@ Control Groups version 1
hugetlb
memcg_test
memory
+ misc
net_cls
net_prio
pids
diff --git a/Documentation/admin-guide/cgroup-v1/misc.rst b/Documentation/admin-guide/cgroup-v1/misc.rst
new file mode 100644
index 000000000000..661614c24df3
--- /dev/null
+++ b/Documentation/admin-guide/cgroup-v1/misc.rst
@@ -0,0 +1,4 @@
+===============
+Misc controller
+===============
+Please refer "Misc" documentation in Documentation/admin-guide/cgroup-v2.rst
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 1de8695c264b..74777323b7fd 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -63,8 +63,11 @@ v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgrou
5-7-1. RDMA Interface Files
5-8. HugeTLB
5.8-1. HugeTLB Interface Files
- 5-8. Misc
- 5-8-1. perf_event
+ 5-9. Misc
+ 5.9-1 Miscellaneous cgroup Interface Files
+ 5.9-2 Migration and Ownership
+ 5-10. Others
+ 5-10-1. perf_event
5-N. Non-normative information
5-N-1. CPU controller root cgroup process behaviour
5-N-2. IO controller root cgroup process behaviour
@@ -2163,6 +2166,68 @@ HugeTLB Interface Files
Misc
----
+The Miscellaneous cgroup provides the resource limiting and tracking
+mechanism for the scalar resources which cannot be abstracted like the other
+cgroup resources. Controller is enabled by the CONFIG_CGROUP_MISC config
+option.
+
+The first two resources added to the miscellaneous controller are Secure
+Encrypted Virtualization (SEV) ASIDs and SEV - Encrypted State (SEV-ES) ASIDs.
+These limited ASIDs are used for encrypting virtual machines memory on the AMD
+platform.
+
+Misc Interface Files
+~~~~~~~~~~~~~~~~~~~~
+
+Miscellaneous controller provides 3 interface files:
+
+ misc.capacity
+ A read-only flat-keyed file shown only in the root cgroup. It shows
+ miscellaneous scalar resources available on the platform along with
+ their quantities::
+
+ $ cat misc.capacity
+ sev 50
+ sev_es 10
+
+ misc.current
+ A read-only flat-keyed file shown in the non-root cgroups. It shows
+ the current usage of the resources in the cgroup and its children.::
+
+ $ cat misc.current
+ sev 3
+ sev_es 0
+
+ misc.max
+ A read-write flat-keyed file shown in the non root cgroups. Allowed
+ maximum usage of the resources in the cgroup and its children.::
+
+ $ cat misc.max
+ sev max
+ sev_es 4
+
+ Limit can be set by::
+
+ # echo sev 1 > misc.max
+
+ Limit can be set to max by::
+
+ # echo sev max > misc.max
+
+ Limits can be set higher than the capacity value in the misc.capacity
+ file.
+
+Migration and Ownership
+~~~~~~~~~~~~~~~~~~~~~~~
+
+A miscellaneous scalar resource is charged to the cgroup in which it is used
+first, and stays charged to that cgroup until that resource is freed. Migrating
+a process to a different cgroup does not move the charge to the destination
+cgroup where the process has moved.
+
+Others
+------
+
perf_event
~~~~~~~~~~
--
2.30.1.766.gb4fecdf3b7-goog
next prev parent reply other threads:[~2021-03-02 8:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 8:17 [RFC v2 0/2] cgroup: New misc cgroup controller Vipin Sharma
2021-03-02 8:17 ` [RFC v2 1/2] cgroup: sev: Add " Vipin Sharma
2021-03-03 15:42 ` Tejun Heo
2021-03-04 6:12 ` Vipin Sharma
2021-03-04 8:53 ` Tejun Heo
2021-03-02 8:17 ` Vipin Sharma [this message]
2021-03-04 2:55 ` [RFC v2 2/2] cgroup: sev: Miscellaneous cgroup documentation Jacob Pan
2021-03-04 6:22 ` Vipin Sharma
2021-03-04 8:51 ` Tejun Heo
2021-03-12 20:58 ` Jacob Pan
2021-03-12 21:15 ` Vipin Sharma
2021-03-12 22:59 ` Jacob Pan
2021-03-13 10:20 ` Tejun Heo
2021-03-13 16:57 ` Jacob Pan
2021-03-13 18:05 ` Tejun Heo
2021-03-15 22:11 ` Jacob Pan
2021-03-15 22:19 ` Tejun Heo
2021-03-15 23:40 ` Jacob Pan
2021-03-15 23:54 ` Tejun Heo
2021-03-16 1:30 ` Jacob Pan
2021-03-16 2:22 ` Tejun Heo
2021-03-16 18:19 ` Jacob Pan
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