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feat(fragmem): unified solution for memory compaction
Signed-off-by: Robin Lu <robin.lu@bytedance.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /* | ||
| Copyright 2022 The Katalyst Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package fragmem | ||
|
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| const ( | ||
| // Constants for fragmem related kernel features | ||
| hostFragScoreFile = "/sys/kernel/debug/extfrag/unusable_index" | ||
| hostCompactProactivenessFile = "/proc/sys/vm/compaction_proactiveness" | ||
| hostMemNodePath = "/sys/devices/system/node/node" | ||
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| fragScoreMin = 50.0 | ||
| fragScoreMax = 90.0 | ||
| minFragScoreGap = 8 | ||
| delayCompactTimes = 10 | ||
| sleepCompactTime = 10 | ||
| minHostLoad = 110 | ||
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|
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| commandKcompactd = "kcompactd" | ||
| ) | ||
|
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||
| const ( | ||
| metricNameMemoryCompaction = "async_handler_memory_compaction" | ||
| ) | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| //go:build linux | ||
| // +build linux | ||
|
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| /* | ||
| Copyright 2022 The Katalyst Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
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| package fragmem | ||
|
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| import ( | ||
| "sync" | ||
| "time" | ||
|
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| "k8s.io/apimachinery/pkg/util/errors" | ||
|
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| memconsts "github.com/kubewharf/katalyst-core/pkg/agent/qrm-plugins/memory/consts" | ||
| coreconfig "github.com/kubewharf/katalyst-core/pkg/config" | ||
| dynamicconfig "github.com/kubewharf/katalyst-core/pkg/config/agent/dynamic" | ||
| "github.com/kubewharf/katalyst-core/pkg/consts" | ||
| "github.com/kubewharf/katalyst-core/pkg/metaserver" | ||
| "github.com/kubewharf/katalyst-core/pkg/metaserver/agent/metric/helper" | ||
| "github.com/kubewharf/katalyst-core/pkg/metrics" | ||
| "github.com/kubewharf/katalyst-core/pkg/util/general" | ||
| ) | ||
|
|
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| var ( | ||
| delayTimes int | ||
| mu sync.RWMutex | ||
| ) | ||
|
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| // SetDelayValue sets the value of the global delayTimes | ||
| func SetDelayTimes(value int) { | ||
| mu.Lock() | ||
| defer mu.Unlock() | ||
| delayTimes = value | ||
| } | ||
|
|
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| // GetDelayValue returns the value of the global delayTimes | ||
| func GetDelayTimes() int { | ||
| mu.RLock() | ||
| defer mu.RUnlock() | ||
| return delayTimes | ||
| } | ||
|
|
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| /* SetMemCompact is the unified solution for memory compaction. | ||
| * it includes 3 parts: | ||
| * 1, set the threshold of fragmentation score that triggers synchronous memory compaction in the memory slow path. | ||
| * 2, if has proactive compaction feature, then set the threshold of fragmentation score for asynchronous memory compaction through compaction_proactiveness. | ||
| * 3, if no proactive compaction feature, then use the async threshold of fragmentation score to trigger manually memory compaction. | ||
| */ | ||
| func SetMemCompact(conf *coreconfig.Configuration, | ||
| _ interface{}, _ *dynamicconfig.DynamicAgentConfiguration, | ||
| emitter metrics.MetricEmitter, metaServer *metaserver.MetaServer, | ||
| ) { | ||
| general.Infof("called") | ||
|
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| var errList []error | ||
| defer func() { | ||
| _ = general.UpdateHealthzStateByError(memconsts.SetMemCompact, errors.NewAggregate(errList)) | ||
| }() | ||
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| if conf == nil { | ||
| general.Errorf("nil extraConf") | ||
| return | ||
| } else if emitter == nil { | ||
| general.Errorf("nil emitter") | ||
| return | ||
| } else if metaServer == nil { | ||
| general.Errorf("nil metaServer") | ||
| return | ||
| } | ||
|
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| delay := GetDelayTimes() | ||
| if delay > 0 { | ||
| general.Infof("No memory fragmentation in this node, skip this scanning cycle, delay=%d", delay) | ||
| delay-- | ||
| SetDelayTimes(delay) | ||
| return | ||
| } | ||
|
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| // EnableSettingMemCompact featuregate. | ||
| if !conf.EnableSettingFragMem { | ||
| general.Infof("EnableSettingFragMem disabled") | ||
| return | ||
| } | ||
|
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| // Step1, check proactive compaction. | ||
| // if proactive compaction feature enabled, then return. | ||
| if !checkCompactionProactivenessDisabled(hostCompactProactivenessFile) { | ||
| general.Infof("proactive compaction enabled, then return") | ||
| return | ||
| } | ||
|
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| // Step2, if proactive compaction feature was disabled, then a user space solution for memory compaction will be triggered. | ||
| // Step2.0, avoid too much system pressure. | ||
| load, err := helper.GetNodeMetricWithTime(metaServer.MetricsFetcher, emitter, consts.MetricLoad5MinSystem) | ||
| if err != nil { | ||
| general.Errorf("Failed to get load:%v", err) | ||
| return | ||
| } | ||
| numCPU := metaServer.CPUTopology.NumCPUs | ||
| loadPerCPU := int(load.Value) * 100 / numCPU | ||
| general.Infof("Host load info: load:%v, numCPU:%v, loadPerCPU:%v", load.Value, numCPU, loadPerCPU) | ||
| if loadPerCPU > minHostLoad { | ||
| return | ||
| } | ||
|
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| // Step2.1, async user space memory compaction will be trigger while exceeding fragScoreWatermark(default:80). | ||
| fragScoreWatermark := uint64(general.Clamp(float64(conf.SetMemFragScoreAsync), fragScoreMin, fragScoreMax)) | ||
| for _, numaID := range metaServer.CPUDetails.NUMANodes().ToSliceNoSortInt() { | ||
| score, err := helper.GetNumaMetricWithTime(metaServer.MetricsFetcher, emitter, consts.MetricMemFragScoreNuma, numaID) | ||
| if err != nil { | ||
| general.Errorf("Failed to get frag score:%v", err) | ||
| continue | ||
| } | ||
| fragScore := int(score.Value) | ||
| general.Infof("NUMA fragScore info: node:%d, fragScore:%d, fragScoreGate:%d", numaID, fragScore, fragScoreWatermark) | ||
| if fragScore < int(fragScoreWatermark) { | ||
| continue | ||
| } | ||
|
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| // Step 2.2, check if kcompactd is in D state | ||
| if isCommandInDState(commandKcompactd) { | ||
| general.Infof("kcompactd is in D state") | ||
| return | ||
| } | ||
|
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| // Step 2.3, do memory compaction in node level | ||
| _ = emitter.StoreInt64(metricNameMemoryCompaction, 1, metrics.MetricTypeNameRaw) | ||
| setHostMemCompact(numaID) | ||
| time.Sleep(sleepCompactTime * time.Second) | ||
|
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| // Step 2.4, if memory compression is not effective, extend the check interval | ||
| newScore, err := helper.GetNumaMetricWithTime(metaServer.MetricsFetcher, emitter, consts.MetricMemFragScoreNuma, numaID) | ||
| if err != nil { | ||
| continue | ||
| } | ||
| newFragScore := int(newScore.Value) | ||
| general.Infof("Node fragScore new info: node:%d, fragScore:%d", numaID, newFragScore) | ||
| // compare the new and old average fragmentation core to avoid ineffective compaction. | ||
| if newFragScore >= int(fragScoreWatermark-minFragScoreGap) { | ||
| general.Infof("No memory fragmentation in this node, increase the scanning cycle") | ||
| SetDelayTimes(delayCompactTimes) | ||
| } | ||
| } | ||
| } |
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