On Sun, Jan 20, 2013 at 5:29 AM, Konstantin Belousov <kostik...@gmail.com>wrote:
> Both atrtc and hpet register the interrupt handler as the filter. > The filters call loop enters critical section around handlers, see > kern_intr.c:intr_event_handle(). At least on HEAD it is so, and I see > the same code in the 8. > Huh, I missed that. However, on 8.2 ipi_bitmap_handler does not do a critical_enter() (while HEAD does), so if CPU 0 gets an IPI_STATCLOCK, we have my bug. I have DTrace data (from 8.2) showing a thread entering sched_switch() from sched_balance() when called through an IPI_STATCLOCK. I'll poke around some more in HEAD to see if there are any entry points (maybe on other architectures) that don't do a critical section, and then add the assertions that you suggested. _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
