Read cpu.stat regardless if controller enabled. #348
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The unified hierarchy provides the cpu.stat file for every cgroup, regardless if the CPU controller is enabled (in fact, setting the systemd property CPUAccounting=True does not enable this controller because of this fact). It provides the usage_usec, user_usec, and system_usec by default. Instead of reading the stat for each enabled controller (CPU and memory), just attempt to read them each time the Stat() function is called. Attempting to read the memory.stat file even if memory accounting is not enabled seems insignificant (some other files always have a read attempt, such as memory.current), and eliminates finding and looping over enabled controllers. Resolves: containerd#347 Signed-off-by: Jackson McKay <[email protected]>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The unified hierarchy provides the cpu.stat file for every cgroup, regardless if the CPU controller is enabled (in fact, setting the systemd property CPUAccounting=True does not enable this controller because of this fact). It provides the usage_usec, user_usec, and system_usec by default. Instead of reading the stat for each enabled controller (CPU and memory), just attempt to read them each time the Stat() function is called.
Attempting to read the memory.stat file even if memory accounting is not enabled seems insignificant (some other files always have a read attempt, such as memory.current), and eliminates finding and looping over enabled controllers.
resolves #347