William Lee Irwin III wrote:

>On Tue, Jul 13, 2004 at 05:28:05AM -0700, William Lee Irwin III wrote:
>  
>
>>>This patch uses the preemption counter increments and decrements to time
>>>non-preemptible critical sections.
>>>This is an instrumentation patch intended to help determine the causes of
>>>scheduling latency related to long non-preemptible critical sections.
>>>Changes from 2.6.7-based patch:
>>>(1) fix unmap_vmas() check correctly this time
>>>(2) add touch_preempt_timing() to cond_resched_lock()
>>>(3) depend on preempt until it's worked out wtf goes wrong without it
>>>      
>>>
>
>On Tue, Jul 13, 2004 at 10:36:00AM -0400, Joe Korty wrote:
>  
>
>>You preemption-block hold times will improve *enormously* if you move all
>>softirq processing down to the daemon (and possibly raise the daemon to
>>one of the higher SCHED_RR priorities, to compensate for softirq processing
>>no longer happening at interrupt level).
>>    
>>
>
>Plausible. Got a patch?
>  
>

How about this?  It moves softirqs to a thread but keeps the old spill 
thread.

This is a patch against 2.6.6 written primarily by Scott Wood.

Signed-off-by: La Monte H.P. Yarroll <piggy@timesys.com> under TS0058

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