Bug 1907924: enable madvdontneed for golang

[rphillips]

Golang 1.12 changed to use MADV_FREE. MADV_FREE is somewhat faster than MADV_DONTNEED; however, the kernel will not try and reclaim memory in golang processes until the system is memory constrained. Cloud servers can potentially page out executable caches, which can cause IOPS throttles. Since golang 1.16 will be changing the default to MADV_DONTNEED, we are going to enable the flag by default.

This patch is 1 of 2. We need a separate patch in MCO to enable the system daemons (Kubelet and Crio).

golang/go#42330

[openshift-ci-robot]

@rphillips: This pull request references Bugzilla bug 1907924, which is invalid:

• expected the bug to target the "4.7.0" release, but it targets "---" instead

Comment /bugzilla refresh to re-evaluate validity if changes to the Bugzilla bug are made, or edit the title of this pull request to link to a different bug.

In response to this:

Bug 1907924: enable madvdontneed for golang

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[rphillips]

/bugzilla refresh
/assign @smarterclayton

[openshift-ci-robot]

@rphillips: This pull request references Bugzilla bug 1907924, which is valid. The bug has been moved to the POST state. The bug has been updated to refer to the pull request using the external bug tracker.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target release (4.7.0) matches configured target release for branch (4.7.0)
• bug is in the state NEW, which is one of the valid states (NEW, ASSIGNED, ON_DEV, POST, POST)

In response to this:

/bugzilla refresh
/assign @smarterclayton

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[rphillips]

e2e-aws-upgrade: /bin/bash: line 59: LEASED_RESOURCE: unbound variable

/test e2e-aws-upgrade

[smarterclayton]

/retest

[sdodson]

/uncc

[rphillips]

/retest

[smarterclayton]

Can't test in PR unfortunately (base doesn't propogate) so YOLO

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rphillips, smarterclayton

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Needs approval from an approver in each of these files:

• base/OWNERS [smarterclayton]

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[openshift-ci-robot]

@rphillips: All pull requests linked via external trackers have merged:

• openshift/images#61

Bugzilla bug 1907924 has been moved to the MODIFIED state.

In response to this:

Bug 1907924: enable madvdontneed for golang

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[tnozicka]

/cherry-pick release-4.6

[openshift-cherrypick-robot]

@tnozicka: new pull request created: #75

In response to this:

/cherry-pick release-4.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.