Messages in this thread | | | Date | Tue, 13 Jul 2004 10:36:00 -0400 | From | Joe Korty <> | Subject | Re: preempt-timing-2.6.8-rc1 |
| |
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
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).
Joe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |