diff options
| author | Jamie Liu <jamieliu@google.com> | 2018-10-17 15:48:55 -0700 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2018-10-17 15:50:02 -0700 |
| commit | b2a88ff4713325fca736f6a3bf200be02d2d72a7 (patch) | |
| tree | 489e54828c2bfe0bf326976920e5d5e612f877a0 /pkg/sentry/kernel/task_exit.go | |
| parent | 6922eee6499212a009fdc254224f916bd1c46f29 (diff) | |
Check thread group CPU timers in the CPU clock ticker.
This reduces the number of goroutines and runtime timers when
ITIMER_VIRTUAL or ITIMER_PROF are enabled, or when RLIMIT_CPU is set.
This also ensures that thread group CPU timers only advance if running
tasks are observed at the time the CPU clock advances, mostly
eliminating the possibility that a CPU timer expiration observes no
running tasks and falls back to the group leader.
PiperOrigin-RevId: 217603396
Change-Id: Ia24ce934d5574334857d9afb5ad8ca0b6a6e65f4
Diffstat (limited to 'pkg/sentry/kernel/task_exit.go')
| -rw-r--r-- | pkg/sentry/kernel/task_exit.go | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/pkg/sentry/kernel/task_exit.go b/pkg/sentry/kernel/task_exit.go index f5b45fb17..65969ca9b 100644 --- a/pkg/sentry/kernel/task_exit.go +++ b/pkg/sentry/kernel/task_exit.go @@ -675,9 +675,6 @@ func (t *Task) exitNotifyLocked(fromPtraceDetach bool) { t.tg.ioUsage.Accumulate(t.ioUsage) t.tg.signalHandlers.mu.Lock() t.tg.tasks.Remove(t) - if t.tg.lastTimerSignalTask == t { - t.tg.lastTimerSignalTask = nil - } t.tg.tasksCount-- tc := t.tg.tasksCount t.tg.signalHandlers.mu.Unlock() |