Merge pull request #59217 from filbranden/cos1

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Increase RSS limit for runtime from 300MB to 350MB on test creating 100 pods per node.

**What this PR does / why we need it**:

In recent COS image (cos-dev-65), the typical RSS increased a bit. It seems it was already close to the limit and now surpassed it.

I looked at some samples of failures of the test... In [some cases](https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/logs/ci-kubernetes-e2e-gce-cosdev-k8sbeta-serial/1270) it seems very close (<1%), a [more representative example](https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/logs/ci-kubernetes-e2e-gce-cosdev-k8sbeta-serial/1266)  goes up about ~5% but in [some](https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/logs/ci-kubernetes-e2e-gce-cosdev-k8sbeta-serial/1269) [cases](https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/logs/ci-kubernetes-e2e-gce-cosdev-k8sbeta-serial/1267) it did go up to close or above 340MB.

I did some tests using just "docker" on the machines, creating 100 "pause" containers. I didn't really see much difference in RSS, though after killing the containers RSS was a bit higher on the host running cos-dev.

I looked at some possible reasons that would explain that:
- Transparent huge pages: confirmed they were disabled;
- Version of docker: same on cos-65, cos-64 and cos-63;
- Version of Go: same, 1.9.2 on cos-64 and cos-65, while 1.9.1 on cos-63 but 64 was already using same as current version;
- Version of systemd (maybe due to systemd libraries linked into Docker?): same on the three images.

I don't really know what can explain this increase... So cc @adityakali in case he has something to add here. Also cc @yguo0905 with whom I discussed the testgrid.




**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
N/A

**Special notes for your reviewer**:
N/A

**Release note**:

```release-note
NONE
```

test/e2e/node/kubelet_perf.go

@@ -257,7 +257,7 @@ var _ = SIGDescribe("Kubelet [Serial] [Slow]", func() {
 				podsPerNode: 100,
 				memLimits: framework.ResourceUsagePerContainer{
 					stats.SystemContainerKubelet: &framework.ContainerResourceUsage{MemoryRSSInBytes: 300 * 1024 * 1024},
-					stats.SystemContainerRuntime: &framework.ContainerResourceUsage{MemoryRSSInBytes: 300 * 1024 * 1024},
+					stats.SystemContainerRuntime: &framework.ContainerResourceUsage{MemoryRSSInBytes: 350 * 1024 * 1024},
 				},
 			},
 		}