JIRA: https://issues.redhat.com/browse/RHEL-56023
commit 6a26f9c68901797261bc145975a02f85be0c1d8f
Author: Xiu Jianfeng <xiujianfeng@huawei.com>
Date: Thu, 11 Jul 2024 10:14:57 +0000
cgroup/misc: Introduce misc.events.local
Currently the event counting provided by misc.events is hierarchical,
it's not practical if user is only concerned with events of a
specified cgroup. Therefore, introduce misc.events.local collect events
specific to the given cgroup.
This is analogous to memory.events.local and pids.events.local.
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-56023
commit 1028f391d5f9d4248e2f49193e6de2516ad630f8
Author: Xiu Jianfeng <xiujianfeng@huawei.com>
Date: Wed, 3 Jul 2024 00:36:46 +0000
cgroup/misc: Introduce misc.peak
Introduce misc.peak to record the historical maximum usage of the
resource, as in some scenarios the value of misc.max could be
adjusted based on the peak usage of the resource.
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-36683
Upstream Status: RHEL only
This reverts commit 08637d76a2 which is a
revert of "Merge: cgroup: Backport upstream cgroup commits up to v6.8"
Signed-off-by: Waiman Long <longman@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-34600
commit 714e08cc3ec564dc1717000f5a4c1f40ca8c8878
Author: Haitao Huang <haitao.huang@linux.intel.com>
Date: Fri, 21 Jul 2023 05:02:31 -0700
cgroup/misc: Store atomic64_t reads to u64
Change 'new_usage' type to u64 so it can be compared with unsigned 'max'
and 'capacity' properly even if the value crosses the signed boundary.
Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-34600
commit 32bf85c60ca3584a7ba3bef19da2779b73b2e7d6
Author: Haitao Huang <haitao.huang@linux.intel.com>
Date: Mon, 17 Jul 2023 18:08:45 -0700
cgroup/misc: Change counters to be explicit 64bit types
So the variables can account for resources of huge quantities even on
32-bit machines.
Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-16027
commit e973dfe9299441ad263efedf094897fbb31e6a87
Author: LeiZhou-97 <lei.zhou@intel.com>
Date: Tue, 13 Jun 2023 18:59:29 +0800
cgroup/misc: Expose misc.current on cgroup v2 root
Hello,
This patch is to expose misc.current on cgroup v2 root for tracking
how much of the resource has been consumed in total on the system.
Most of the cloud infrastucture use cgroup to fetch the host
information for scheduling purpose.
Currently, the misc controller can be used by Intel TDX HKIDs and
AMD SEV ASIDs, which are both used for creating encrypted VMs.
Intel TDX and AMD SEV are mostly be used by the cloud providers
for providing confidential VMs.
In actual use of a server, these confidential VMs may be launched
in different ways. For the cloud solution, there are kubvirt and
coco (tracked by kubepods.slice); on host, they can be booted
directly through qemu by end user (tracked by user.slice), etc.
In this complex environment, when wanting to know how many resource
is used in total it has to iterate through all existing slices to
get the value of each misc.current and add them up to calculate
the total number of consumed keys.
So exposing misc.current to root cgroup tends to give much easier
when calculates how much resource has been used in total, which
helps to schedule and count resources for the cloud infrastucture.
Signed-off-by: LeiZhou-97 <lei.zhou@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2190004
commit b03357528fd9516600ff358ab5d4b887b8cb80e8
Author: Chunguang Xu <brookxu@tencent.com>
Date: Fri, 17 Sep 2021 20:44:15 +0800
misc_cgroup: remove error log to avoid log flood
In scenarios where containers are frequently created and deleted,
a large number of error logs maybe generated. The logs only show
which node is about to go over the max limit, not the node which
resource request failed. As misc.events has provided relevant
information, maybe we can remove this log.
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2190004
commit f279294b329363eb6ada568e494d609ef78e3e8e
Author: Chunguang Xu <brookxu@tencent.com>
Date: Fri, 17 Sep 2021 20:44:14 +0800
misc_cgroup: introduce misc.events to count failures
Introduce misc.events to make it easier for us to understand
the pressure of resources. Currently only the 'max' event is
implemented, which indicates the times the resource is about
to exceeds the max limit.
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Reviewed-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Secure Encrypted Virtualization (SEV) and Secure Encrypted
Virtualization - Encrypted State (SEV-ES) ASIDs are used to encrypt KVMs
on AMD platform. These ASIDs are available in the limited quantities on
a host.
Register their capacity and usage to the misc controller for tracking
via cgroups.
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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.
A resource can be added to the controller via enum misc_res_type{} in
the include/linux/misc_cgroup.h file and the corresponding name via
misc_res_name[] in the kernel/cgroup/misc.c file. Provider of the
resource must set its capacity prior to using the resource by calling
misc_cg_set_capacity().
Once a capacity is set then the resource usage can be updated using
charge and uncharge APIs. All of the APIs to interact with misc
controller are in include/linux/misc_cgroup.h.
Miscellaneous controller provides 3 interface files. If two misc
resources (res_a and res_b) are registered then:
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
res_a 50
res_b 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
res_a 3
res_b 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
res_a max
res_b 4
Limit can be set by::
# echo res_a 1 > misc.max
Limit can be set to max by::
# echo res_a max > misc.max
Limits can be set more than the capacity value in the misc.capacity
file.
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Waiman Long
Lucas Zampieri
Vipin Sharma