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-rw-r--r--pkg/sentry/control/pprof.go15
-rw-r--r--pkg/sentry/kernel/kernel.go20
-rw-r--r--pkg/sentry/kernel/syscalls.go8
-rw-r--r--pkg/sentry/kernel/task.go20
-rw-r--r--pkg/sentry/kernel/task_block.go8
-rw-r--r--pkg/sentry/kernel/task_clone.go1
-rw-r--r--pkg/sentry/kernel/task_exec.go3
-rw-r--r--pkg/sentry/kernel/task_exit.go1
-rw-r--r--pkg/sentry/kernel/task_log.go86
-rw-r--r--pkg/sentry/kernel/task_run.go14
-rw-r--r--pkg/sentry/kernel/task_start.go8
-rw-r--r--pkg/sentry/kernel/task_syscall.go8
12 files changed, 171 insertions, 21 deletions
diff --git a/pkg/sentry/control/pprof.go b/pkg/sentry/control/pprof.go
index 1f78d54a2..e1f2fea60 100644
--- a/pkg/sentry/control/pprof.go
+++ b/pkg/sentry/control/pprof.go
@@ -22,6 +22,7 @@ import (
"sync"
"gvisor.dev/gvisor/pkg/fd"
+ "gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/urpc"
)
@@ -56,6 +57,9 @@ type Profile struct {
// traceFile is the current execution trace output file.
traceFile *fd.FD
+
+ // Kernel is the kernel under profile.
+ Kernel *kernel.Kernel
}
// StartCPUProfile is an RPC stub which starts recording the CPU profile in a
@@ -147,6 +151,9 @@ func (p *Profile) StartTrace(o *ProfileOpts, _ *struct{}) error {
return err
}
+ // Ensure all trace contexts are registered.
+ p.Kernel.RebuildTraceContexts()
+
p.traceFile = output
return nil
}
@@ -158,9 +165,15 @@ func (p *Profile) StopTrace(_, _ *struct{}) error {
defer p.mu.Unlock()
if p.traceFile == nil {
- return errors.New("Execution tracing not start")
+ return errors.New("Execution tracing not started")
}
+ // Similarly to the case above, if tasks have not ended traces, we will
+ // lose information. Thus we need to rebuild the tasks in order to have
+ // complete information. This will not lose information if multiple
+ // traces are overlapping.
+ p.Kernel.RebuildTraceContexts()
+
trace.Stop()
p.traceFile.Close()
p.traceFile = nil
diff --git a/pkg/sentry/kernel/kernel.go b/pkg/sentry/kernel/kernel.go
index 28ba950bd..bd3fb4c03 100644
--- a/pkg/sentry/kernel/kernel.go
+++ b/pkg/sentry/kernel/kernel.go
@@ -841,9 +841,11 @@ func (k *Kernel) CreateProcess(args CreateProcessArgs) (*ThreadGroup, ThreadID,
AbstractSocketNamespace: args.AbstractSocketNamespace,
ContainerID: args.ContainerID,
}
- if _, err := k.tasks.NewTask(config); err != nil {
+ t, err := k.tasks.NewTask(config)
+ if err != nil {
return nil, 0, err
}
+ t.traceExecEvent(tc) // Simulate exec for tracing.
// Success.
tgid := k.tasks.Root.IDOfThreadGroup(tg)
@@ -1118,6 +1120,22 @@ func (k *Kernel) SendContainerSignal(cid string, info *arch.SignalInfo) error {
return lastErr
}
+// RebuildTraceContexts rebuilds the trace context for all tasks.
+//
+// Unfortunately, if these are built while tracing is not enabled, then we will
+// not have meaningful trace data. Rebuilding here ensures that we can do so
+// after tracing has been enabled.
+func (k *Kernel) RebuildTraceContexts() {
+ k.extMu.Lock()
+ defer k.extMu.Unlock()
+ k.tasks.mu.RLock()
+ defer k.tasks.mu.RUnlock()
+
+ for t, tid := range k.tasks.Root.tids {
+ t.rebuildTraceContext(tid)
+ }
+}
+
// FeatureSet returns the FeatureSet.
func (k *Kernel) FeatureSet() *cpuid.FeatureSet {
return k.featureSet
diff --git a/pkg/sentry/kernel/syscalls.go b/pkg/sentry/kernel/syscalls.go
index 220fa73a2..2fdee0282 100644
--- a/pkg/sentry/kernel/syscalls.go
+++ b/pkg/sentry/kernel/syscalls.go
@@ -339,6 +339,14 @@ func (s *SyscallTable) Lookup(sysno uintptr) SyscallFn {
return nil
}
+// LookupName looks up a syscall name.
+func (s *SyscallTable) LookupName(sysno uintptr) string {
+ if sc, ok := s.Table[sysno]; ok {
+ return sc.Name
+ }
+ return fmt.Sprintf("sys_%d", sysno) // Unlikely.
+}
+
// LookupEmulate looks up an emulation syscall number.
func (s *SyscallTable) LookupEmulate(addr usermem.Addr) (uintptr, bool) {
sysno, ok := s.Emulate[addr]
diff --git a/pkg/sentry/kernel/task.go b/pkg/sentry/kernel/task.go
index 80c8e5464..ab0c6c4aa 100644
--- a/pkg/sentry/kernel/task.go
+++ b/pkg/sentry/kernel/task.go
@@ -15,6 +15,8 @@
package kernel
import (
+ gocontext "context"
+ "runtime/trace"
"sync"
"sync/atomic"
@@ -390,7 +392,14 @@ type Task struct {
// logPrefix is a string containing the task's thread ID in the root PID
// namespace, and is prepended to log messages emitted by Task.Infof etc.
- logPrefix atomic.Value `state:".(string)"`
+ logPrefix atomic.Value `state:"nosave"`
+
+ // traceContext and traceTask are both used for tracing, and are
+ // updated along with the logPrefix in updateInfoLocked.
+ //
+ // These are exclusive to the task goroutine.
+ traceContext gocontext.Context `state:"nosave"`
+ traceTask *trace.Task `state:"nosave"`
// creds is the task's credentials.
//
@@ -528,14 +537,6 @@ func (t *Task) loadPtraceTracer(tracer *Task) {
t.ptraceTracer.Store(tracer)
}
-func (t *Task) saveLogPrefix() string {
- return t.logPrefix.Load().(string)
-}
-
-func (t *Task) loadLogPrefix(prefix string) {
- t.logPrefix.Store(prefix)
-}
-
func (t *Task) saveSyscallFilters() []bpf.Program {
if f := t.syscallFilters.Load(); f != nil {
return f.([]bpf.Program)
@@ -549,6 +550,7 @@ func (t *Task) loadSyscallFilters(filters []bpf.Program) {
// afterLoad is invoked by stateify.
func (t *Task) afterLoad() {
+ t.updateInfoLocked()
t.interruptChan = make(chan struct{}, 1)
t.gosched.State = TaskGoroutineNonexistent
if t.stop != nil {
diff --git a/pkg/sentry/kernel/task_block.go b/pkg/sentry/kernel/task_block.go
index dd69939f9..4a4a69ee2 100644
--- a/pkg/sentry/kernel/task_block.go
+++ b/pkg/sentry/kernel/task_block.go
@@ -16,6 +16,7 @@ package kernel
import (
"runtime"
+ "runtime/trace"
"time"
ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
@@ -133,19 +134,24 @@ func (t *Task) block(C <-chan struct{}, timerChan <-chan struct{}) error {
runtime.Gosched()
}
+ region := trace.StartRegion(t.traceContext, blockRegion)
select {
case <-C:
+ region.End()
t.SleepFinish(true)
+ // Woken by event.
return nil
case <-interrupt:
+ region.End()
t.SleepFinish(false)
// Return the indicated error on interrupt.
return syserror.ErrInterrupted
case <-timerChan:
- // We've timed out.
+ region.End()
t.SleepFinish(true)
+ // We've timed out.
return syserror.ETIMEDOUT
}
}
diff --git a/pkg/sentry/kernel/task_clone.go b/pkg/sentry/kernel/task_clone.go
index 0916fd658..3eadfedb4 100644
--- a/pkg/sentry/kernel/task_clone.go
+++ b/pkg/sentry/kernel/task_clone.go
@@ -299,6 +299,7 @@ func (t *Task) Clone(opts *CloneOptions) (ThreadID, *SyscallControl, error) {
// nt that it must receive before its task goroutine starts running.
tid := nt.k.tasks.Root.IDOfTask(nt)
defer nt.Start(tid)
+ t.traceCloneEvent(tid)
// "If fork/clone and execve are allowed by @prog, any child processes will
// be constrained to the same filters and system call ABI as the parent." -
diff --git a/pkg/sentry/kernel/task_exec.go b/pkg/sentry/kernel/task_exec.go
index 17a089b90..90a6190f1 100644
--- a/pkg/sentry/kernel/task_exec.go
+++ b/pkg/sentry/kernel/task_exec.go
@@ -129,6 +129,7 @@ type runSyscallAfterExecStop struct {
}
func (r *runSyscallAfterExecStop) execute(t *Task) taskRunState {
+ t.traceExecEvent(r.tc)
t.tg.pidns.owner.mu.Lock()
t.tg.execing = nil
if t.killed() {
@@ -253,7 +254,7 @@ func (t *Task) promoteLocked() {
t.tg.leader = t
t.Infof("Becoming TID %d (in root PID namespace)", t.tg.pidns.owner.Root.tids[t])
- t.updateLogPrefixLocked()
+ t.updateInfoLocked()
// Reap the original leader. If it has a tracer, detach it instead of
// waiting for it to acknowledge the original leader's death.
oldLeader.exitParentNotified = true
diff --git a/pkg/sentry/kernel/task_exit.go b/pkg/sentry/kernel/task_exit.go
index 535f03e50..435761e5a 100644
--- a/pkg/sentry/kernel/task_exit.go
+++ b/pkg/sentry/kernel/task_exit.go
@@ -236,6 +236,7 @@ func (*runExit) execute(t *Task) taskRunState {
type runExitMain struct{}
func (*runExitMain) execute(t *Task) taskRunState {
+ t.traceExitEvent()
lastExiter := t.exitThreadGroup()
// If the task has a cleartid, and the thread group wasn't killed by a
diff --git a/pkg/sentry/kernel/task_log.go b/pkg/sentry/kernel/task_log.go
index a29e9b9eb..0fb3661de 100644
--- a/pkg/sentry/kernel/task_log.go
+++ b/pkg/sentry/kernel/task_log.go
@@ -16,6 +16,7 @@ package kernel
import (
"fmt"
+ "runtime/trace"
"sort"
"gvisor.dev/gvisor/pkg/log"
@@ -127,11 +128,88 @@ func (t *Task) debugDumpStack() {
}
}
-// updateLogPrefix updates the task's cached log prefix to reflect its
-// current thread ID.
+// trace definitions.
+//
+// Note that all region names are prefixed by ':' in order to ensure that they
+// are lexically ordered before all system calls, which use the naked system
+// call name (e.g. "read") for maximum clarity.
+const (
+ traceCategory = "task"
+ runRegion = ":run"
+ blockRegion = ":block"
+ cpuidRegion = ":cpuid"
+ faultRegion = ":fault"
+)
+
+// updateInfoLocked updates the task's cached log prefix and tracing
+// information to reflect its current thread ID.
//
// Preconditions: The task's owning TaskSet.mu must be locked.
-func (t *Task) updateLogPrefixLocked() {
+func (t *Task) updateInfoLocked() {
// Use the task's TID in the root PID namespace for logging.
- t.logPrefix.Store(fmt.Sprintf("[% 4d] ", t.tg.pidns.owner.Root.tids[t]))
+ tid := t.tg.pidns.owner.Root.tids[t]
+ t.logPrefix.Store(fmt.Sprintf("[% 4d] ", tid))
+ t.rebuildTraceContext(tid)
+}
+
+// rebuildTraceContext rebuilds the trace context.
+//
+// Precondition: the passed tid must be the tid in the root namespace.
+func (t *Task) rebuildTraceContext(tid ThreadID) {
+ // Re-initialize the trace context.
+ if t.traceTask != nil {
+ t.traceTask.End()
+ }
+
+ // Note that we define the "task type" to be the dynamic TID. This does
+ // not align perfectly with the documentation for "tasks" in the
+ // tracing package. Tasks may be assumed to be bounded by analysis
+ // tools. However, if we just use a generic "task" type here, then the
+ // "user-defined tasks" page on the tracing dashboard becomes nearly
+ // unusable, as it loads all traces from all tasks.
+ //
+ // We can assume that the number of tasks in the system is not
+ // arbitrarily large (in general it won't be, especially for cases
+ // where we're collecting a brief profile), so using the TID is a
+ // reasonable compromise in this case.
+ t.traceContext, t.traceTask = trace.NewTask(t, fmt.Sprintf("tid:%d", tid))
+}
+
+// traceCloneEvent is called when a new task is spawned.
+//
+// ntid must be the new task's ThreadID in the root namespace.
+func (t *Task) traceCloneEvent(ntid ThreadID) {
+ if !trace.IsEnabled() {
+ return
+ }
+ trace.Logf(t.traceContext, traceCategory, "spawn: %d", ntid)
+}
+
+// traceExitEvent is called when a task exits.
+func (t *Task) traceExitEvent() {
+ if !trace.IsEnabled() {
+ return
+ }
+ trace.Logf(t.traceContext, traceCategory, "exit status: 0x%x", t.exitStatus.Status())
+}
+
+// traceExecEvent is called when a task calls exec.
+func (t *Task) traceExecEvent(tc *TaskContext) {
+ if !trace.IsEnabled() {
+ return
+ }
+ d := tc.MemoryManager.Executable()
+ if d == nil {
+ trace.Logf(t.traceContext, traceCategory, "exec: << unknown >>")
+ return
+ }
+ defer d.DecRef()
+ root := t.fsContext.RootDirectory()
+ if root == nil {
+ trace.Logf(t.traceContext, traceCategory, "exec: << no root directory >>")
+ return
+ }
+ defer root.DecRef()
+ n, _ := d.FullName(root)
+ trace.Logf(t.traceContext, traceCategory, "exec: %s", n)
}
diff --git a/pkg/sentry/kernel/task_run.go b/pkg/sentry/kernel/task_run.go
index c92266c59..d97f8c189 100644
--- a/pkg/sentry/kernel/task_run.go
+++ b/pkg/sentry/kernel/task_run.go
@@ -17,6 +17,7 @@ package kernel
import (
"bytes"
"runtime"
+ "runtime/trace"
"sync/atomic"
"gvisor.dev/gvisor/pkg/abi/linux"
@@ -205,9 +206,11 @@ func (*runApp) execute(t *Task) taskRunState {
t.tg.pidns.owner.mu.RUnlock()
}
+ region := trace.StartRegion(t.traceContext, runRegion)
t.accountTaskGoroutineEnter(TaskGoroutineRunningApp)
info, at, err := t.p.Switch(t.MemoryManager().AddressSpace(), t.Arch(), t.rseqCPU)
t.accountTaskGoroutineLeave(TaskGoroutineRunningApp)
+ region.End()
if clearSinglestep {
t.Arch().ClearSingleStep()
@@ -225,6 +228,7 @@ func (*runApp) execute(t *Task) taskRunState {
case platform.ErrContextSignalCPUID:
// Is this a CPUID instruction?
+ region := trace.StartRegion(t.traceContext, cpuidRegion)
expected := arch.CPUIDInstruction[:]
found := make([]byte, len(expected))
_, err := t.CopyIn(usermem.Addr(t.Arch().IP()), &found)
@@ -232,10 +236,12 @@ func (*runApp) execute(t *Task) taskRunState {
// Skip the cpuid instruction.
t.Arch().CPUIDEmulate(t)
t.Arch().SetIP(t.Arch().IP() + uintptr(len(expected)))
+ region.End()
// Resume execution.
return (*runApp)(nil)
}
+ region.End() // Not an actual CPUID, but required copy-in.
// The instruction at the given RIP was not a CPUID, and we
// fallthrough to the default signal deliver behavior below.
@@ -251,8 +257,10 @@ func (*runApp) execute(t *Task) taskRunState {
// an application-generated signal and we should continue execution
// normally.
if at.Any() {
+ region := trace.StartRegion(t.traceContext, faultRegion)
addr := usermem.Addr(info.Addr())
err := t.MemoryManager().HandleUserFault(t, addr, at, usermem.Addr(t.Arch().Stack()))
+ region.End()
if err == nil {
// The fault was handled appropriately.
// We can resume running the application.
@@ -260,6 +268,12 @@ func (*runApp) execute(t *Task) taskRunState {
}
// Is this a vsyscall that we need emulate?
+ //
+ // Note that we don't track vsyscalls as part of a
+ // specific trace region. This is because regions don't
+ // stack, and the actual system call will count as a
+ // region. We should be able to easily identify
+ // vsyscalls by having a <fault><syscall> pair.
if at.Execute {
if sysno, ok := t.tc.st.LookupEmulate(addr); ok {
return t.doVsyscall(addr, sysno)
diff --git a/pkg/sentry/kernel/task_start.go b/pkg/sentry/kernel/task_start.go
index ae6fc4025..3522a4ae5 100644
--- a/pkg/sentry/kernel/task_start.go
+++ b/pkg/sentry/kernel/task_start.go
@@ -154,10 +154,10 @@ func (ts *TaskSet) newTask(cfg *TaskConfig) (*Task, error) {
// Below this point, newTask is expected not to fail (there is no rollback
// of assignTIDsLocked or any of the following).
- // Logging on t's behalf will panic if t.logPrefix hasn't been initialized.
- // This is the earliest point at which we can do so (since t now has thread
- // IDs).
- t.updateLogPrefixLocked()
+ // Logging on t's behalf will panic if t.logPrefix hasn't been
+ // initialized. This is the earliest point at which we can do so
+ // (since t now has thread IDs).
+ t.updateInfoLocked()
if cfg.InheritParent != nil {
t.parent = cfg.InheritParent.parent
diff --git a/pkg/sentry/kernel/task_syscall.go b/pkg/sentry/kernel/task_syscall.go
index b543d536a..3180f5560 100644
--- a/pkg/sentry/kernel/task_syscall.go
+++ b/pkg/sentry/kernel/task_syscall.go
@@ -17,6 +17,7 @@ package kernel
import (
"fmt"
"os"
+ "runtime/trace"
"syscall"
"gvisor.dev/gvisor/pkg/abi/linux"
@@ -160,6 +161,10 @@ func (t *Task) executeSyscall(sysno uintptr, args arch.SyscallArguments) (rval u
ctrl = ctrlStopAndReinvokeSyscall
} else {
fn := s.Lookup(sysno)
+ var region *trace.Region // Only non-nil if tracing == true.
+ if trace.IsEnabled() {
+ region = trace.StartRegion(t.traceContext, s.LookupName(sysno))
+ }
if fn != nil {
// Call our syscall implementation.
rval, ctrl, err = fn(t, args)
@@ -167,6 +172,9 @@ func (t *Task) executeSyscall(sysno uintptr, args arch.SyscallArguments) (rval u
// Use the missing function if not found.
rval, err = t.SyscallTable().Missing(t, sysno, args)
}
+ if region != nil {
+ region.End()
+ }
}
if bits.IsOn32(fe, ExternalAfterEnable) && (s.ExternalFilterAfter == nil || s.ExternalFilterAfter(t, sysno, args)) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 14:00:49 +0000