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Calculating the disk usage based on available bytes instead of usage bytes to account for reserved blocks in image GC

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This commit is contained in:
Ron Lai 2016-06-23 17:44:56 -07:00
parent a27fd4b01e
commit 038b8797c4
2 changed files with 13 additions and 9 deletions
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10
pkg/kubelet/image_manager.go
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@ -213,8 +213,12 @@ func (im *realImageManager) GarbageCollect() error {
if err != nil { if err != nil {
return err return err
} }
usage := int64(fsInfo.Usage)
capacity := int64(fsInfo.Capacity) capacity := int64(fsInfo.Capacity)
available := int64(fsInfo.Available)
if available > capacity {
glog.Warningf("available %d is larger than capacity %d", available, capacity)
available = capacity
}
// Check valid capacity. // Check valid capacity.
if capacity == 0 { if capacity == 0 {
@ -224,9 +228,9 @@ func (im *realImageManager) GarbageCollect() error {
} }
// If over the max threshold, free enough to place us at the lower threshold. // If over the max threshold, free enough to place us at the lower threshold.
usagePercent := int(usage * 100 / capacity) usagePercent := 100 - int(available*100/capacity)
if usagePercent >= im.policy.HighThresholdPercent { if usagePercent >= im.policy.HighThresholdPercent {
amountToFree := usage - (int64(im.policy.LowThresholdPercent) * capacity / 100) amountToFree := capacity*int64(100-im.policy.LowThresholdPercent)/100 - available
glog.Infof("[ImageManager]: Disk usage on %q (%s) is at %d%% which is over the high threshold (%d%%). Trying to free %d bytes", fsInfo.Device, fsInfo.Mountpoint, usagePercent, im.policy.HighThresholdPercent, amountToFree) glog.Infof("[ImageManager]: Disk usage on %q (%s) is at %d%% which is over the high threshold (%d%%). Trying to free %d bytes", fsInfo.Device, fsInfo.Mountpoint, usagePercent, im.policy.HighThresholdPercent, amountToFree)
freed, err := im.freeSpace(amountToFree, time.Now()) freed, err := im.freeSpace(amountToFree, time.Now())
if err != nil { if err != nil {

12
pkg/kubelet/image_manager_test.go
View File

@ -374,8 +374,8 @@ func TestGarbageCollectBelowLowThreshold(t *testing.T) {
// Expect 40% usage. // Expect 40% usage.
mockCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{ mockCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{
Usage: 400, Available: 600,
Capacity: 1000, Capacity: 1000,
}, nil) }, nil)
assert.NoError(t, manager.GarbageCollect()) assert.NoError(t, manager.GarbageCollect())
@ -401,8 +401,8 @@ func TestGarbageCollectBelowSuccess(t *testing.T) {
// Expect 95% usage and most of it gets freed. // Expect 95% usage and most of it gets freed.
mockCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{ mockCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{
Usage: 950, Available: 50,
Capacity: 1000, Capacity: 1000,
}, nil) }, nil)
fakeRuntime.ImageList = []container.Image{ fakeRuntime.ImageList = []container.Image{
makeImage(0, 450), makeImage(0, 450),
@ -420,8 +420,8 @@ func TestGarbageCollectNotEnoughFreed(t *testing.T) {
// Expect 95% usage and little of it gets freed. // Expect 95% usage and little of it gets freed.
mockCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{ mockCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{
Usage: 950, Available: 50,
Capacity: 1000, Capacity: 1000,
}, nil) }, nil)
fakeRuntime.ImageList = []container.Image{ fakeRuntime.ImageList = []container.Image{
makeImage(0, 50), makeImage(0, 50),