gvisor

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Jamie Liu 7920b5b40a kernel: improve tcpip.Timer implementation

- Move ktime.VariableTimer to kernel.timekeeperTcpipTimer, its only use case.
  This allows timekeeperTcpipTimer to use concrete types kernel.timekeeperClock
  and ktime.SampledTimer instead of ktime.Clock and ktime.Timer, saving a tiny
  amount of memory (interface values consist of two pointers) and CPU (for
  interface method calls).

- Fix a bug where timekeeperTcpipTimer expiration can cancel a racing call to
  timekeeperTcpipTimer.Reset() (see use of new field
  timekeeperTcpipTimer.resets).

- Define Listener.NotifyTimer directly on timekeeperTcpipTimer (dropping
  ktime.functionNotifier), and move goroutine spawning from the anonymous
  function in ktime.AfterFunc() into timekeeperTcpipTimer.NotifyTimer(). This
  slightly simplifies the control flow and saves an allocation for the
  anonymous function object.

- Use monotonicClock rather than realtimeClock. It doesn't make sense for
  time-of-day clock adjustments to affect netstack timeouts, and this is
  consistent with tcpip.stdClock => time.AfterFunc => runtime.timer.

PiperOrigin-RevId: 695504159

2024-11-11 15:38:55 -08:00

BUILD

kernel: improve tcpip.Timer implementation

2024-11-11 15:38:55 -08:00

context.go

Move //pkg/sentry/kernel/time to //pkg/sentry/ktime.

2024-11-06 18:13:51 -08:00

ktime.go

ktime: support varying Timer implementations

2024-11-07 17:19:25 -08:00

sampled_timer.go

ktime: support varying Timer implementations