On Thu, Mar 27, 2008 at 06:38:44PM -0700, David Miller wrote:

This runs from softirqs, the local thread's scheduling
state is updated from timers which also run from softirqs,
so this need_resched() test won't work.

I had a trawl through the scheduler/timer code and it appears
that even with softirqs disabled we should able to set the flag
through this call chain (on x86-32):

timer_interrupt => do_timer_interrupt_hook => tick_handle_periodic =>
tick_periodic => update_process_times => scheduler_tick

Ingo, could you confirm that the scheduler is capable of setting
need_resched even with BH disabled?

Thanks,
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