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?