CVS commit: src/sys

[Andrew Doran <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Tue May 27 14:48:52 UTC 2008

Modified Files:
        src/sys/kern: kern_idle.c kern_runq.c
        src/sys/sys: idle.h sched.h

Log Message:
PR kern/38707 scheduler related deadlock during build.sh

- Fix performance regression inroduced by the workaround by making job
  stealing a lot simpler: if the local run queue is empty, let the CPU enter
  the idle loop. In the idle loop, try to steal a job from another CPU's run
  queue if we are idle. If we succeed, re-enter mi_switch() immediatley to
  dispatch the job.

- When stealing jobs, consider a remote CPU to have one less job in its
  queue if it's currently in the idle loop. It will dispatch the job soon,
  so there's no point sloshing it about.

- Introduce a few event counters to monitor what's happening with the run
  queues.

- Revert the idle CPU bitmap change. It's pointless considering NUMA.


To generate a diff of this commit:
cvs rdiff -r1.17 -r1.18 src/sys/kern/kern_idle.c
cvs rdiff -r1.9 -r1.10 src/sys/kern/kern_runq.c
cvs rdiff -r1.3 -r1.4 src/sys/sys/idle.h
cvs rdiff -r1.56 -r1.57 src/sys/sys/sched.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.