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Merge pull request #23948 from derekwaynecarr/memory_available

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Add memory available to summary stats provider

To support out of resource killing when low on memory, we want to let operators specify eviction thresholds based on available memory instead of memory usage for ease of use when working with heterogeneous nodes.  

So for example, a valid eviction threshold would be the following: 
* If node.memory.available < 200Mi for 30s, then evict pod(s)

For the node, `memory.availableBytes` is always known since the `memory.limit_in_bytes` is always known for root cgroup.  For individual containers in pods, we only populate the `availableBytes` if the container was launched with a memory limit specified.  When no memory limit is specified, the cgroupfs sets a value of 1 << 63 in the `memory.limit_in_bytes` so we look for a similar max value to handle unbounded limits, and ignore setting `memory.availableBytes`.

FYI @vishh @timstclair - as discussed on Slack.

/cc @kubernetes/sig-node @kubernetes/rh-cluster-infra
This commit is contained in:
k8s-merge-robot
2016-04-17 06:32:36 -07:00
parent 2b9637da6a a9e362d70c
commit 75b49f591a
3 changed files with 71 additions and 21 deletions
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5
pkg/kubelet/api/v1alpha1/stats/types.go
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@@ -128,10 +128,13 @@ type CPUStats struct {
type MemoryStats struct {
// The time at which these stats were updated.
Time unversioned.Time `json:"time"`
// Available memory for use. This is defined as the memory limit - workingSetBytes.
// If memory limit is undefined, the available bytes is omitted.
AvailableBytes *uint64 `json:"availableBytes,omitempty"`
// Total memory in use. This includes all memory regardless of when it was accessed.
UsageBytes *uint64 `json:"usageBytes,omitempty"`
// The amount of working set memory. This includes recently accessed memory,
// dirty memory, and kernel memory. UsageBytes is <= TotalBytes.
// dirty memory, and kernel memory. WorkingSetBytes is <= UsageBytes
WorkingSetBytes *uint64 `json:"workingSetBytes,omitempty"`
// The amount of anonymous and swap cache memory (includes transparent
// hugepages).