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We don't know how stable they are, so let's start with warning.
PiperOrigin-RevId: 278484186
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Kernel.cpuClockTicker increments kernel.cpuClock, which tasks use as a clock to
track their CPU usage. This improves latency in the syscall path by avoid
expensive monotonic clock calls on every syscall entry/exit.
However, this timer fires every 10ms. Thus, when all tasks are idle (i.e.,
blocked or stopped), this forces a sentry wakeup every 10ms, when we may
otherwise be able to sleep until the next app-relevant event. These wakeups
cause the sentry to utilize approximately 2% CPU when the application is
otherwise idle.
Updates to clock are not strictly necessary when the app is idle, as there are
no readers of cpuClock. This commit reduces idle CPU by disabling the timer
when tasks are completely idle, and computing its effects at the next wakeup.
Rather than disabling the timer as soon as the app goes idle, we wait until the
next tick, which provides a window for short sleeps to sleep and wakeup without
doing the (relatively) expensive work of disabling and enabling the timer.
PiperOrigin-RevId: 272265822
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Bump up the threshold on number of SIGALRMs received by worker
threads from 50 to 200. Even with the new threshold we still
expect that the majority of SIGALRMs are received by the
thread group leader.
PiperOrigin-RevId: 254289787
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Based on the guidelines at
https://opensource.google.com/docs/releasing/authors/.
1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./'
2. Manual fixup of "Google Inc" references.
3. Add AUTHORS file. Authors may request to be added to this file.
4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS.
Fixes #209
PiperOrigin-RevId: 245823212
Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
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PiperOrigin-RevId: 225455503
Change-Id: I327fc6e7ba26532b628f343dece3bd9fc4d3b524
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This allows ValueOrDie() to be called on PosixErrorOr rvalues (e.g.
temporaries) holding move-only types without extraneous std::move()s.
PiperOrigin-RevId: 225098036
Change-Id: I662862e4f3562141f941845fc6e197edb27ce29b
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PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22
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