Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1

[Ingo Molnar]

* Mark_H_Johnson@xxxxxxxxxxxx <Mark_H_Johnson@xxxxxxxxxxxx> wrote:

> 00000004 0.005ms (+0.321ms): send_IPI_mask_bitmask (flush_tlb_others)
> 00010004 0.327ms (+0.000ms): do_nmi (flush_tlb_others)
> 00010004 0.327ms (+0.003ms): do_nmi (kallsyms_lookup)

these traces happen if you forget to do 'dmesg -n 1' to turn off console
output. One CPU does a latency-printout with interrupts disabled, and
this CPU keeps waiting in flush_tlb_others(). The second do_nmi() entry
(which is a special one, showing the other CPU's activity) indeed shows
that the CPU is executing in kallsyms_lookup() - possibly it's in the
middle of a latency printout.

i havent seen such type of traces with 'dmesg -n 1'.

	Ingo
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