Sitsofe Wheeler wrote:
> Hi Alexey,
>
> Alexey Starikovskiy wrote:
>> I think the least troubling place to add cond_resched() is then 
>> ACPICA is exiting interpreter.
>> Please check if the attached patch helps with latencies.
>
> There was no real change (latency was still bad). If you look at the 
> trace (before your patch) on 
> http://sucs.org/~sits/test/eeepc-debug/20080923/latency_trace.gz 
> (700kbyte compressed, 15Mbytes uncompressed) you can see that 
> acpi_ex_exit_interpreter is only called once near the end of the trace:
>
>      cat-5901    0.N.. 270496us : acpi_ex_exit_interpreter 
> (acpi_ev_address_space_dispatch)
>
> By then the time had already been racked up...
>
Ok, let's add it to the end of acpi_ps_complete_op() then... They appear 
every 100usec or so...