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Add methods for listing and fetching container stats

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This uses the previously unusued lib/stats.go code to return data
about container stats to the CRI API. Helpers have been built around
filtering based on the OCI API, and CPU stat reporting has been fixed.

No data on filesystem layer usage is returned at this time.

Fixes one-half of #1248

Signed-off-by: Yann Ramin <atrus@stackworks.net>
This commit is contained in:
Yann Ramin 2018-01-07 14:16:46 -08:00
parent ef57cf2810
commit 14c1c70407
4 changed files with 118 additions and 41 deletions
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14
lib/stats.go
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@ -15,8 +15,8 @@ import (
type ContainerStats struct {
Container string
CPU float64
cpuNano uint64
systemNano uint64
CPUNano uint64
SystemNano int64
MemUsage uint64
MemLimit uint64
MemPerc float64
@ -29,8 +29,8 @@ type ContainerStats struct {
// GetContainerStats gets the running stats for a given container
func (c *ContainerServer) GetContainerStats(ctr *oci.Container, previousStats *ContainerStats) (*ContainerStats, error) {
previousCPU := previousStats.cpuNano
previousSystem := previousStats.systemNano
previousCPU := previousStats.CPUNano
previousSystem := previousStats.SystemNano
libcontainerStats, err := c.LibcontainerStats(ctr)
if err != nil {
return nil, err
@ -38,6 +38,8 @@ func (c *ContainerServer) GetContainerStats(ctr *oci.Container, previousStats *C
cgroupStats := libcontainerStats.CgroupStats
stats := new(ContainerStats)
stats.Container = ctr.ID()
stats.CPUNano = cgroupStats.CpuStats.CpuUsage.TotalUsage
stats.SystemNano = time.Now().UnixNano()
stats.CPU = calculateCPUPercent(libcontainerStats, previousCPU, previousSystem)
stats.MemUsage = cgroupStats.MemoryStats.Usage.Usage
stats.MemLimit = getMemLimit(cgroupStats.MemoryStats.Usage.Limit)
@ -84,11 +86,11 @@ func getContainerNetIO(stats *libcontainer.Stats) (received uint64, transmitted
return
}
func calculateCPUPercent(stats *libcontainer.Stats, previousCPU, previousSystem uint64) float64 {
func calculateCPUPercent(stats *libcontainer.Stats, previousCPU uint64, previousSystem int64) float64 {
var (
cpuPercent = 0.0
cpuDelta = float64(stats.CgroupStats.CpuStats.CpuUsage.TotalUsage - previousCPU)
systemDelta = float64(uint64(time.Now().UnixNano()) - previousSystem)
systemDelta = float64(uint64(time.Now().UnixNano()) - uint64(previousSystem))
)
if systemDelta > 0.0 && cpuDelta > 0.0 {
// gets a ratio of container cpu usage total, multiplies it by the number of cores (4 cores running