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// Copyright 2021 The gVisor 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 boot
import (
"os"
"runtime"
"runtime/pprof"
"runtime/trace"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/sentry/control"
)
// startProfiling initiates profiling as defined by the ProfileConfig, and
// returns a function that should be called to stop profiling.
func startProfiling(args Args) func() {
var onStopProfiling []func()
stopProfiling := func() {
for _, f := range onStopProfiling {
f()
}
}
if args.ProfileBlockFD >= 0 {
file := os.NewFile(uintptr(args.ProfileBlockFD), "profile-block")
runtime.SetBlockProfileRate(control.DefaultBlockProfileRate)
onStopProfiling = append(onStopProfiling, func() {
if err := pprof.Lookup("block").WriteTo(file, 0); err != nil {
log.Warningf("Error writing block profile: %v", err)
}
file.Close()
runtime.SetBlockProfileRate(0)
})
}
if args.ProfileCPUFD >= 0 {
file := os.NewFile(uintptr(args.ProfileCPUFD), "profile-cpu")
pprof.StartCPUProfile(file)
onStopProfiling = append(onStopProfiling, func() {
pprof.StopCPUProfile()
file.Close()
})
}
if args.ProfileHeapFD >= 0 {
file := os.NewFile(uintptr(args.ProfileHeapFD), "profile-heap")
onStopProfiling = append(onStopProfiling, func() {
if err := pprof.Lookup("heap").WriteTo(file, 0); err != nil {
log.Warningf("Error writing heap profile: %v", err)
}
file.Close()
})
}
if args.ProfileMutexFD >= 0 {
file := os.NewFile(uintptr(args.ProfileMutexFD), "profile-mutex")
prev := runtime.SetMutexProfileFraction(control.DefaultMutexProfileRate)
onStopProfiling = append(onStopProfiling, func() {
if err := pprof.Lookup("mutex").WriteTo(file, 0); err != nil {
log.Warningf("Error writing mutex profile: %v", err)
}
file.Close()
runtime.SetMutexProfileFraction(prev)
})
}
if args.TraceFD >= 0 {
file := os.NewFile(uintptr(args.TraceFD), "trace")
trace.Start(file)
onStopProfiling = append(onStopProfiling, func() {
trace.Stop()
file.Close()
})
}
return stopProfiling
}
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