timerfd: Guard expected performance failure

During the timerfd__periodic_timer_performance test, only expect
failures when the expiration count is less than 400000000. This
prevents the test from be

timerfd: Guard expected performance failure

During the timerfd__periodic_timer_performance test, only expect
failures when the expiration count is less than 400000000. This
prevents the test from being reported as a true failure in environments
where scheduling latency is high enough to delay timerfd wakeups.

Fixes: cb692380f1e0 ("timerfd: Expect periodic timer ...")
MFC after: 1 week

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timerfd: Expect periodic timer performance failures

The current timerfd implementation fails to correctly count events on a
nanosecond callout interval. The timerfd__periodic_timer_performance
test

timerfd: Expect periodic timer performance failures

The current timerfd implementation fails to correctly count events on a
nanosecond callout interval. The timerfd__periodic_timer_performance
test detects this and reports failure.

Mark this test as an expected failure so it isn't flagged by CI. A link
to the bug report is attached to the test for reference.

While we're here, clean up some minor style and Make issues.

Fixes: 834c1ba793d9 ("timerfd: Add tests")
MFC after: 1 week

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timerfd: Fix interval callout scheduling

When a timerfd interval callout misses its scheduled activation time, a
differential is calculated based on the actual activation time and the
scheduled acti

timerfd: Fix interval callout scheduling

When a timerfd interval callout misses its scheduled activation time, a
differential is calculated based on the actual activation time and the
scheduled activation time. This differential is divided by the timerfd's
interval time and the quotient is added to the timerfd's counter.

Before this change, the next callout was scheduled to activate at:
scheduled activation time + timerfd interval.

This change fixes the scheduling of the next callout to activate at:
actual activation time + timerfd interval - remainder.

Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D55790
MFC after: 2 weeks

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timerfd: Add tests

Take Jan Kokemuller's timerfd tests from the epoll-shim project,
stripping out code that isn't directly related to FreeBSD.

Reviewed by: markj
Differential Revision: https://rev

timerfd: Add tests

Take Jan Kokemuller's timerfd tests from the epoll-shim project,
stripping out code that isn't directly related to FreeBSD.

Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D55789
MFC after: 2 weeks

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