Re: preempt-timing-2.6.8-rc1

William Lee Irwin III
2004-07-13T14:40:37Z

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?

-- wli