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Konstantin Belousov
b48aeaf4cf
Prevent parallel tc_windup() calls, both parallel top-level calls from setclock() and from simultaneous top-level and interrupt. For this, tc_windup() is protected with a tc_setclock_mtx spinlock, in the try mode when called from hardclock interrupt. If spinlock cannot be obtained without spinning from the interrupt context, this means that top-level executes tc_windup() on other core and our try may be avoided. The boottimebin and boottime variables should be adjusted from tc_windup(). To be correct, they must be part of the timehands and read using lockless protocol. Remove the globals and reimplement the getboottime(9)/getboottimebin(9) KPI using the timehands read protocol. Tested by: pho (as part of the whole patch) Reviewed by: jhb (same) Discussed wit: bde Sponsored by: The FreeBSD Foundation MFC after: 1 month X-Differential revision: https://reviews.freebsd.org/D7302 Update #3175.
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