virtcontainers: reimplement sandbox cgroup #1189

devimc · 2019-01-28T21:56:58Z

All containers run in different cgroups even the sandbox, with this new
implementation the sandbox cpu cgroup wil be equal to the sum of all its
containers and the hypervisor process will be placed there impacting to the
containers running in the sandbox (VM). The default number of vcpus is
used when the sandbox has no constraints. For example, if default_vcpus
is 2, then quota will be 200000 and period 100000.

c-ray test
http://www.futuretech.blinkenlights.nl/c-ray.html

+=============================================+
|         | 6 threads 6cpus | 1 thread 1 cpu  |
+=============================================+
| current |   40 seconds    |   122 seconds   |
+==============================================
|   new   |   37 seconds    |   124 seconds   |
+==============================================

current = current cgroups implementation
new = new cgroups implementation

workload

apiVersion: v1
kind: Pod
metadata:
name: c-ray
annotations:
io.kubernetes.cri.untrusted-workload: "true"
spec:
restartPolicy: Never
containers:
- name: c-ray-1
image: docker.io/devimc/c-ray:latest
imagePullPolicy: IfNotPresent
args: ["-t", "6", "-s", "1600x1200", "-r", "8", "-i",
      "/c-ray-1.1/sphfract", "-o", "/tmp/output.ppm"]
resources:
  limits:
    cpu: 6
- name: c-ray-2
image: docker.io/devimc/c-ray:latest
imagePullPolicy: IfNotPresent
args: ["-t", "1", "-s", "1600x1200", "-r", "8", "-i",
      "/c-ray-1.1/sphfract", "-o", "/tmp/output.ppm"]
resources:
  limits:
    cpu: 1

fixes #1125

Signed-off-by: Julio Montes [email protected]

devimc · 2019-01-28T21:57:50Z

@WeiZhang555 please take a look

devimc · 2019-01-29T15:22:13Z

@jcvenegas please take a look

WeiZhang555 · 2019-01-30T01:31:27Z

/test

WeiZhang555

Thanks for the effort! I left some comments, great work!

virtcontainers/container.go

virtcontainers/cgroups.go

WeiZhang555 · 2019-01-30T02:26:19Z

virtcontainers/cgroups.go

-	for _, i := range tids.vcpus {
-		if i <= 0 {
-			continue
-		}


Adding only the vcpus threads is an optimization, which can benefit to small chunks IO performance according to our previous test.

It's OK to remove this if it makes the handling logic too complicated, I'm just wishing to share the performance tuning result to community.

sure I can check that, what tests did you run?

You can test with some network benchmark tools such as netperf, or disk IO benchmark tools such as FIO or iozone. Try to send/receive with small chunks(e.g. 4k package), for one VM with 1 cpu, you can compare W/ or W/O "cpu cgroup of 1 cpu constraint", I believe you can see how the performance is different.

you're right, performance is not good moving the whole hypervisor, I have updated the pull request, now the performance is good, thanks

current - current implementation
new - new implementation
no-cgroup - container without constraints

WeiZhang555 · 2019-01-30T02:34:38Z

virtcontainers/cgroups.go

-	// first move all processes in subgroup to parent in case live process blocks
-	// deletion of cgroup
-	if err := s.cgroup.sandboxSub.MoveTo(s.cgroup.commonParent); err != nil {
-		return fmt.Errorf("failed to clear cgroup processes")


In my previous test, a left-over process (zoombie or removed too slowly) can block the cgroup's deletion which will cause cgroup dir left on disk after sandbox destroyed.

Have you tested this case? I don't see similar code in deleteCgroups

I ran a simple test, and seems like cgroups are removed properly

I noticed lefacy cgroup occasinally before, without specified test case.

I think you can emulate the behaviour by adding some other pid from host OS to that cgroup, and when you delete the container, the cgroup dir will be left. This is a easy emulation not the real case.

yes, cgroups are removed, I filed an issue to test it once this pr land

issue kata-containers/tests#1177

virtcontainers/cgroups.go

WeiZhang555 · 2019-01-30T02:44:15Z

virtcontainers/types/sandbox.go

+
+	// CgroupPath is the cgroup hierarchy where sandbox's processes
+	// including the hypervisor are placed.
+	CgroupPath string `json:"cgroupPath,omitempty"`


This can bring potential broken compatibility.

Suppose sandboxA is created by old kata-runtime and runs for some time, after we upgrade kata-runtime, and when using the new kata-runtime to delete the old container, it will search state.json file from disk and end up to find nothing, The cgroup dir can fail to delete and garbage left.

That's why https://github.com/kata-containers/runtime/pull/883 is important.

The influence is not that big caused by this modification, so I can accept the modification so far.

devimc · 2019-01-30T19:55:25Z

@WeiZhang555 changes applied, thanks

jcvenegas · 2019-02-01T16:30:59Z

virtcontainers/container.go

+func (c *Container) newCgroups() error {
+	ann := c.GetAnnotations()
+
+	config, ok := ann[annotations.ConfigJSONKey]


We use in many places the config json, at some point better to move it from annotations, virtcontainers is not agnostic at all.

Agree. We can definitely save the config in Container . This way we can save many disk read and json Unmarshaling.

jcvenegas

I already tested cpuset with k8s and docker they are working as I expected, I added a quick review, I'll do a second round later.

jcvenegas · 2019-02-01T16:40:34Z

virtcontainers/cgroups.go

-	sandboxSub, err := parent.New(s.id, &specs.LinuxResources{})
+// V1Constraints returns the cgroups that are compatible with th VC architecture
+// and hypervisor, constraints can be applied to these cgroups.
+func V1Constraints() ([]cgroups.Subsystem, error) {


I dont fully get the naming of the cunftions it is because of cgroups v1? I prefer remove that prefix if does not add any information.

This implementation is based on containerd cgroups https://github.com/kata-containers/runtime/blob/master/vendor/github.com/containerd/cgroups/v1.go#L28

jcvenegas · 2019-02-01T16:44:18Z

virtcontainers/cgroups.go

+			fields = strings.Split(text, " ")
+			// safe as mountinfo encodes mountpoints with spaces as \040.
+			index               = strings.Index(text, " - ")
+			postSeparatorFields = strings.Fields(text[index+3:])


Magic number

copy&paste of a containerd private function https://github.com/kata-containers/runtime/blob/master/vendor/github.com/containerd/cgroups/v1.go#L49

jcvenegas · 2019-02-01T16:45:55Z

virtcontainers/cgroups.go

+		if numPostFields == 0 {
+			return "", fmt.Errorf("Found no fields post '-' in %q", text)
+		}
+		if postSeparatorFields[0] == "cgroup" {


Index access without check len

https://github.com/kata-containers/runtime/blob/master/vendor/github.com/containerd/cgroups/v1.go#L72

jcvenegas · 2019-02-01T16:46:38Z

virtcontainers/cgroups.go

+		)
+		// this is an error as we can't detect if the mount is for "cgroup"
+		if numPostFields == 0 {
+			return "", fmt.Errorf("Found no fields post '-' in %q", text)


Not really useful error (at least for me)

jcvenegas · 2019-02-01T16:46:53Z

virtcontainers/cgroups.go

+		}
+		if postSeparatorFields[0] == "cgroup" {
+			// check that the mount is properly formated.
+			if numPostFields < 3 {


Magic number

https://github.com/kata-containers/runtime/blob/master/vendor/github.com/containerd/cgroups/v1.go#L74

jcvenegas · 2019-02-01T16:47:50Z

virtcontainers/cgroups.go

+			if numPostFields < 3 {
+				return "", fmt.Errorf("Error found less than 3 fields post '-' in %q", text)
+			}
+			return filepath.Dir(fields[4]), nil


Index access with out check length

https://github.com/kata-containers/runtime/blob/master/vendor/github.com/containerd/cgroups/v1.go#L77

jcvenegas · 2019-02-01T16:49:10Z

virtcontainers/cgroups.go

+			return filepath.Dir(fields[4]), nil
+		}
+	}
+	return "", cgroups.ErrMountPointNotExist


I wonder if cgroups api does not provide a function like this.
From this file what is string is supose to return ?

cat /proc/self/mountinfo | grep cgroup 27 20 0:24 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:4 - tmpfs tmpfs ro,seclabel,mode=755 28 27 0:25 / /sys/fs/cgroup/unified rw,nosuid,nodev,noexec,relatime shared:5 - cgroup2 cgroup2 rw,seclabel,nsdelegate 29 27 0:26 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:6 - cgroup cgroup rw,seclabel,xattr,name=systemd 33 27 0:30 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:7 - cgroup cgroup rw,seclabel,cpu,cpuacct 34 27 0:31 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:8 - cgroup cgroup rw,seclabel,freezer 35 27 0:32 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:9 - cgroup cgroup rw,seclabel,blkio 36 27 0:33 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:10 - cgroup cgroup rw,seclabel,cpuset 37 27 0:34 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:11 - cgroup cgroup rw,seclabel,devices 38 27 0:35 / /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime shared:12 - cgroup cgroup rw,seclabel,perf_event 39 27 0:36 / /sys/fs/cgroup/hugetlb rw,nosuid,nodev,noexec,relatime shared:13 - cgroup cgroup rw,seclabel,hugetlb 40 27 0:37 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:14 - cgroup cgroup rw,seclabel,memory 41 27 0:38 / /sys/fs/cgroup/net_cls,net_prio rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,seclabel,net_cls,net_prio 42 27 0:39 / /sys/fs/cgroup/pids rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,seclabel,pids

it does, but it's private https://github.com/kata-containers/runtime/blob/master/vendor/github.com/containerd/cgroups/v1.go#L49

devimc · 2019-02-05T16:25:44Z

/test

devimc · 2019-02-05T20:17:10Z

/test

devimc · 2019-02-05T20:32:46Z

ping @raravena80

raravena80 · 2019-02-05T20:37:53Z

@devimc did you mean to ping @WeiZhang555? 😄

devimc · 2019-02-05T20:39:55Z

@raravena80 nop, this needs review 😄

raravena80

Looks fine to me, I assume it passed all tests. Did you address @WeiZhang555's comment? I believe I'm not an approver.

devimc · 2019-02-05T20:53:22Z

@raravena80 thanks

devimc · 2019-02-05T21:11:31Z

/test

devimc · 2019-02-06T18:21:31Z

/test

devimc · 2019-02-06T21:51:35Z

Shimv2 tests are failing with this change

STEP: stop PodSandbox
E0206 21:45:40.234455   28101 remote_runtime.go:115] StopPodSandbox "762c340ac84f4b554cfbee6b8fd058d9b7dfbd832dd30b77acf6e8b2431a4d54" from runtime service failed: rpc error: code = Unknown desc = failed to stop container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f": failed to kill container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f": Could not find the container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f" from the sandbox "762c340ac84f4b554cfbee6b8fd058d9b7dfbd832dd30b77acf6e8b2431a4d54" containers list: unknown
STEP: delete PodSandbox
E0206 21:45:40.236155   28101 remote_runtime.go:229] StopContainer "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f" from runtime service failed: rpc error: code = Unknown desc = failed to kill container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f": Could not find the container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f" from the sandbox "762c340ac84f4b554cfbee6b8fd058d9b7dfbd832dd30b77acf6e8b2431a4d54" containers list: unknown
Feb  6 21:45:40.236: INFO: Unexpected error occurred: rpc error: code = Unknown desc = failed to kill container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f": Could not find the container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f" from the sandbox "762c340ac84f4b554cfbee6b8fd058d9b7dfbd832dd30b77acf6e8b2431a4d54" containers list: unknown
E0206 21:45:40.236587   28101 remote_runtime.go:132] RemovePodSandbox "762c340ac84f4b554cfbee6b8fd058d9b7dfbd832dd30b77acf6e8b2431a4d54" from runtime service failed: rpc error: code = Unknown desc = sandbox container "762c340ac84f4b554cfbee6b8fd058d9b7dfbd832dd30b77acf6e8b2431a4d54" is not fully stopped
[AfterEach] [k8s.io] Container
  /tmp/cri-install-crictl.sDoz/src/github.com/kubernetes-sigs/cri-tools/pkg/framework/framework.go:51


• Failure [67.015 seconds]
[k8s.io] Container
/tmp/cri-install-crictl.sDoz/src/github.com/kubernetes-sigs/cri-tools/pkg/framework/framework.go:72
  runtime should support basic operations on container
  /tmp/cri-install-crictl.sDoz/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:68
    runtime should support stopping container [Conformance] [It]
    /tmp/cri-install-crictl.sDoz/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:100

    Feb  6 21:45:40.229: stop container "91cd574ea84883dc442e90fb04f1a0af1880437212bf53720825c087f2f3054f" timeout.

I'm trying to debug it but I don't see logs in the journal. @lifupan any thoughts?

devimc · 2019-02-18T18:51:37Z

/test

devimc · 2019-02-18T20:26:31Z

ping @kata-containers/runtime

devimc · 2019-02-18T22:02:48Z

/test

devimc · 2019-02-19T14:42:07Z

@WeiZhang555 @lifupan @jcvenegas please take a look

jcvenegas · 2019-02-19T17:51:30Z

virtcontainers/container.go

+	// Add shim into cgroup
+	if c.process.Pid > 0 {
+		if err := cgroup.Add(cgroups.Process{Pid: c.process.Pid}); err != nil {
+			return fmt.Errorf("Could not add PID %d to cgroup %v: %v", c.process.Pid, spec.Linux.CgroupsPath, err)


What about deleted cgroup if the operation was not successful ? In a defer maybe?

I'd prefer to leave it there and delete it once delete command is used, otherwise we'll face some issues with tools that monitor the cgroups

In that case, I wonder should not delay c.state.CgroupPath = spec.Linux.CgroupsPath to the end ? If return intermediately we dont save the path in the state.

you're right, fixing, thanks

cpu cgroups are container's specific hence all containers even the sandbox should be able o create, delete and update their cgroups. The cgroup crated matches with the cgroup path passed by the containers manager. fixes kata-containers#1117 fixes kata-containers#1118 fixes kata-containers#1021 Signed-off-by: Julio Montes <[email protected]>

All containers run in different cgroups even the sandbox, with this new implementation the sandbox cpu cgroup wil be equal to the sum of all its containers and the hypervisor process will be placed there impacting to the containers running in the sandbox (VM). The default number of vcpus is used when the sandbox has no constraints. For example, if default_vcpus is 2, then quota will be 200000 and period 100000. **c-ray test** http://www.futuretech.blinkenlights.nl/c-ray.html ``` +=============================================+ | | 6 threads 6cpus | 1 thread 1 cpu | +=============================================+ | current | 40 seconds | 122 seconds | +============================================== | new | 37 seconds | 124 seconds | +============================================== ``` current = current cgroups implementation new = new cgroups implementation **workload** ```yaml apiVersion: v1 kind: Pod metadata: name: c-ray annotations: io.kubernetes.cri.untrusted-workload: "true" spec: restartPolicy: Never containers: - name: c-ray-1 image: docker.io/devimc/c-ray:latest imagePullPolicy: IfNotPresent args: ["-t", "6", "-s", "1600x1200", "-r", "8", "-i", "/c-ray-1.1/sphfract", "-o", "/tmp/output.ppm"] resources: limits: cpu: 6 - name: c-ray-2 image: docker.io/devimc/c-ray:latest imagePullPolicy: IfNotPresent args: ["-t", "1", "-s", "1600x1200", "-r", "8", "-i", "/c-ray-1.1/sphfract", "-o", "/tmp/output.ppm"] resources: limits: cpu: 1 ``` fixes kata-containers#1153 Signed-off-by: Julio Montes <[email protected]>

container is killed by force, container's state MUST change its state to stop immediately to avoid leaving it in a bad state. fixes kata-containers#1088 Signed-off-by: Julio Montes <[email protected]>

To avoid long timeouts, the runtime shouldn't try to talk with the proxy when it's not running. Signed-off-by: Julio Montes <[email protected]>

jcvenegas · 2019-02-19T19:22:04Z

lgtm

jcvenegas · 2019-02-19T19:35:44Z

/test

sboeuf · 2019-02-20T16:28:28Z

Oh no... I wanted to review this, and I was expecting more approval for this PR since that is a pretty important/big change...

sboeuf · 2019-02-20T17:07:23Z

virtcontainers/container.go

+	// container was killed by force, container MUST change its state
+	// as soon as possible just in case one of below operations fail leaving
+	// the containers in a bad state.
+	if err := c.setContainerState(types.StateStopped); err != nil {


How is it related to the PR? I'm not saying this is not fixing something, but it's been hidden into the PR that is supposed to fix cgroups, not the lifecycle of a container. This is the type of changes that can have a big impact and that is good to get reviewed standalone through its own PR.

sboeuf · 2019-02-20T17:08:00Z

virtcontainers/kata_agent.go

@@ -1569,6 +1569,13 @@ func (k *kataAgent) sendReq(request interface{}) (interface{}, error) {
 	span.SetTag("request", request)
 	defer span.Finish()

+	if k.state.ProxyPid > 0 {


Same thing here, I don't think this is related to cgroups, and this should not be part the same PR.

sboeuf · 2019-02-20T17:12:18Z

virtcontainers/qemu.go

+}
+
+func (q *qemu) pid() int {
+	data, err := ioutil.ReadFile(q.pidFile())


The PID has been stored through its own file? Don't you think we could improve this by having the PID part of the qemu.state structure? This would be saved as part of the state.json file associated with the VM, and it would avoid yet another file to be created.

devimc requested a review from WeiZhang555 January 28, 2019 21:56

devimc force-pushed the topic/fixCpuCgroup branch from 009a12a to 2da5814 Compare January 28, 2019 21:57

devimc requested a review from jcvenegas January 29, 2019 15:22

jcvenegas mentioned this pull request Jan 29, 2019

cgroup: ignore cpuset if can not be applied. kata-containers/agent#447

Merged

WeiZhang555 reviewed Jan 30, 2019

View reviewed changes

devimc force-pushed the topic/fixCpuCgroup branch from 2da5814 to 747636e Compare January 30, 2019 19:45

devimc force-pushed the topic/fixCpuCgroup branch from 747636e to df502f1 Compare January 31, 2019 21:08

jcvenegas reviewed Feb 1, 2019

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devimc force-pushed the topic/fixCpuCgroup branch from df502f1 to 37a8448 Compare February 5, 2019 16:17

devimc force-pushed the topic/fixCpuCgroup branch 2 times, most recently from eb36e74 to 14e5ea3 Compare February 5, 2019 19:56

raravena80 reviewed Feb 5, 2019

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devimc force-pushed the topic/fixCpuCgroup branch from 14e5ea3 to ca4b9cf Compare February 5, 2019 21:10

devimc force-pushed the topic/fixCpuCgroup branch from ca4b9cf to 498c7bc Compare February 6, 2019 18:11

devimc force-pushed the topic/fixCpuCgroup branch 2 times, most recently from 89e8893 to 01c86c3 Compare February 6, 2019 21:49

devimc force-pushed the topic/fixCpuCgroup branch from 5dcce06 to 746f6ad Compare February 18, 2019 18:50

devimc force-pushed the topic/fixCpuCgroup branch from 746f6ad to 107faaf Compare February 18, 2019 21:47

This was referenced Feb 19, 2019

kata not supporting cpuset/cpus via cri? #1079

Closed

cgroup: Check that cpu and cpuset are set correctly in the host kata-containers/tests#1199

Closed

jcvenegas reviewed Feb 19, 2019

View reviewed changes

Julio Montes added 4 commits February 19, 2019 13:13

virtcontainers: change container's state to stop asap

62c393c

container is killed by force, container's state MUST change its state to stop immediately to avoid leaving it in a bad state. fixes kata-containers#1088 Signed-off-by: Julio Montes <[email protected]>

virtcontainers: don't try to talk with the proxy when it's not running

58d2785

To avoid long timeouts, the runtime shouldn't try to talk with the proxy when it's not running. Signed-off-by: Julio Montes <[email protected]>

devimc force-pushed the topic/fixCpuCgroup branch from 107faaf to 58d2785 Compare February 19, 2019 19:15

jcvenegas approved these changes Feb 19, 2019

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devimc mentioned this pull request Feb 20, 2019

cgroups: some question about kata host cgroup set #1256

Closed

GabyCT approved these changes Feb 20, 2019

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GabyCT merged commit 60f7c4f into kata-containers:master Feb 20, 2019

devimc mentioned this pull request Feb 20, 2019

add cpuset cgroup on the host. #1157

Closed

sboeuf reviewed Feb 20, 2019

View reviewed changes

egernst mentioned this pull request Feb 26, 2019

Stable 1.5.1 rc #1281

Merged

WeiZhang555 mentioned this pull request Mar 28, 2019

[RFC]cgroup: Move all qemu to sandbox cgroup #1431

Closed

devimc deleted the topic/fixCpuCgroup branch April 8, 2019 14:51

This was referenced Apr 11, 2019

virtcontainers: prepend a kata specific string to host cgroups path #1518

Merged

Resource governance doesn't work with kata 1.6.0 #1521

Closed

virtcontainers: reimplement sandbox cgroup #1189

virtcontainers: reimplement sandbox cgroup #1189

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