Stephen J Day
fd1a7dfd47
To avoid noise in sampling CPU usage metrics, we now sample the system usage closer to the actual response from the underlying runtime. Because the response from the runtime may be delayed, this makes the sampling more resilient in loaded conditions. In addition to this, we also replace the tick with a sleep to avoid situations where ticks can backup under loaded conditions. The trade off here is slightly more load reading the system CPU usage for each container. There may be an optimization required for large amounts of containers but the cost is on the order of 15 ms per 1000 containers. If this becomes a problem, we can time slot the sampling, but the complexity may not be worth it unless we can test further. Unfortunately, there aren't really any good tests for this condition. Triggering this behavior is highly system dependent. As a matter of course, we should qualify the fix with the users that are affected. Signed-off-by: Stephen J Day <stephen.day@docker.com> (cherry picked from commit fd0e24b7189374e0fe7c55b6d26ee916d3ee1655) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Docker CE
This repository hosts open source components of Docker CE products. The
master branch serves to unify the upstream components on a regular
basis. Long-lived release branches host the code that goes into a product
version for the lifetime of the product.
This repository is solely maintained by Docker, Inc.
Issues
There are separate issue-tracking repos for the end user Docker CE products specialized for a platform. Find your issue or file a new issue for the platform you are using:
- https://github.com/docker/for-linux
- https://github.com/docker/for-mac
- https://github.com/docker/for-win
- https://github.com/docker/for-aws
- https://github.com/docker/for-azure
Unifying upstream sources
The master branch is a combination of components adapted from
different upstream git repos into a unified directory structure using the
moby-components
tool.
You can view the upstream git repos in the components.conf file. Each component is isolated into its own directory under the components directory.
The tool will import each component git history within the appropriate path.
For example, this shows a commit
is imported into the component engine from
moby/moby@a27b4b8
into the components/engine directory.
commit 5c70746915d4589a692cbe50a43cf619ed0b7152
Author: Andrea Luzzardi <aluzzardi@gmail.com>
Date: Sat Jan 19 00:13:39 2013
Initial commit
Upstream-commit: a27b4b8cb8e838d03a99b6d2b30f76bdaf2f9e5d
Component: engine
components/engine/container.go | 203 ++++++++++++++++++++++++++++...
components/engine/container_test.go | 186 ++++++++++++++++++++++++++++...
components/engine/docker.go | 112 ++++++++++++++++++++++++++++...
components/engine/docker_test.go | 175 ++++++++++++++++++++++++++++...
components/engine/filesystem.go | 52 ++++++++++++++++++++++++++++...
components/engine/filesystem_test.go | 35 +++++++++++++++++++++++++++
components/engine/lxc_template.go | 94 ++++++++++++++++++++++++++++...
components/engine/state.go | 48 ++++++++++++++++++++++++++++...
components/engine/utils.go | 115 ++++++++++++++++++++++++++++...
components/engine/utils_test.go | 126 ++++++++++++++++++++++++++++...
10 files changed, 1146 insertions(+)
Updates to master branch
Main development of new features should be directed towards the upstream
git repos. The master branch of this repo will periodically pull in new
changes from upstream to provide a point for integration.
Branching for release
When a release is started for Docker CE, a new branch will be created
from master. Branch names will be YY.MM to represent the time-based
release version of the product, e.g. 17.06.
Adding fixes to release branch
Note: every commit of a fix should affect files only within one component directory.
Fix available upstream
A PR cherry-picking the necessary commits should be created against the release branch. If the the cherry-pick cannot be applied cleanly, the logic of the fix should be ported manually.
No fix yet
First create the PR with the fix for the release branch. Once the fix has been merged, be sure to port the fix to the respective upstream git repo.
Release tags
There will be a git tag for each release candidate (RC) and general availablilty (GA) release. The tag will only point to commits on release branches.