96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package boot
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import (
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"os"
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"runtime"
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"runtime/pprof"
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"runtime/trace"
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"gvisor.dev/gvisor/pkg/log"
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"gvisor.dev/gvisor/pkg/sentry/control"
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)
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// startProfiling initiates profiling as defined by the ProfileConfig, and
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// returns a function that should be called to stop profiling.
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func startProfiling(args Args) func() {
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var onStopProfiling []func()
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stopProfiling := func() {
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for _, f := range onStopProfiling {
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f()
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}
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}
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if args.ProfileBlockFD >= 0 {
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file := os.NewFile(uintptr(args.ProfileBlockFD), "profile-block")
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runtime.SetBlockProfileRate(control.DefaultBlockProfileRate)
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onStopProfiling = append(onStopProfiling, func() {
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if err := pprof.Lookup("block").WriteTo(file, 0); err != nil {
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log.Warningf("Error writing block profile: %v", err)
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}
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file.Close()
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runtime.SetBlockProfileRate(0)
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})
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}
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if args.ProfileCPUFD >= 0 {
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file := os.NewFile(uintptr(args.ProfileCPUFD), "profile-cpu")
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pprof.StartCPUProfile(file)
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onStopProfiling = append(onStopProfiling, func() {
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pprof.StopCPUProfile()
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file.Close()
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})
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}
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if args.ProfileHeapFD >= 0 {
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file := os.NewFile(uintptr(args.ProfileHeapFD), "profile-heap")
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onStopProfiling = append(onStopProfiling, func() {
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if err := pprof.Lookup("heap").WriteTo(file, 0); err != nil {
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log.Warningf("Error writing heap profile: %v", err)
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}
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file.Close()
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})
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}
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if args.ProfileMutexFD >= 0 {
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file := os.NewFile(uintptr(args.ProfileMutexFD), "profile-mutex")
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prev := runtime.SetMutexProfileFraction(control.DefaultMutexProfileRate)
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onStopProfiling = append(onStopProfiling, func() {
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if err := pprof.Lookup("mutex").WriteTo(file, 0); err != nil {
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log.Warningf("Error writing mutex profile: %v", err)
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}
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file.Close()
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runtime.SetMutexProfileFraction(prev)
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})
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}
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if args.TraceFD >= 0 {
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file := os.NewFile(uintptr(args.TraceFD), "trace")
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trace.Start(file)
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onStopProfiling = append(onStopProfiling, func() {
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trace.Stop()
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file.Close()
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})
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}
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return stopProfiling
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}
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