updated scheduler changes/fixes, against 2.5.27-BK + cli-sti-cleanup-B2 +
remove-irqlock-E0:
http://redhat.com/~mingo/O(1)-scheduler/sched-2.5.27-C0
Bugfixes:
- introduce new type of context-switch locking, this is a must-have for
ia64 and sparc64.
- load_balance() bug noticed by Scott Rhine and myself: scan the
whole list to find imbalance number of tasks, not just the tail
of the list.
- sched_yield() fix: use current->array not rq->active.
Features:
- SCHED_BATCH feature.
- ->first_time_slice to limit the number of timeslices 'won' via child
exit - this is the logical equivalent of the child-timeslice
distribution change in Andrea's tree.
- sched_yield() cleanup and simplification: yielding puts the task
into the expired queue. This eliminates spurious yields in which
the same task repeatedly calls into yield() without achieving
anything. It's also the most logical thing to do - the yielder
has asked for other tasks to be scheduled first.
Cleanups, smaller changes:
- simpler locking in schedule_tail().
- load_balance() cleanup: split up into find_busiest_queue(),
pull_task() and load_balance() functions.
- idle_tick() cleanups: use a parameter already existing in the
calling function.
- scheduler_tick() cleanups: use more intuitive variable names.
- remove obsolete comments.
- clear ->first_time_slice when a new timeslice is calculated.
- move the sched initialization code to the end of sched.c.
- no need for nr_uninterruptible to be signed.
Ingo
-
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This archive was generated by hypermail 2b29 : Tue Jul 23 2002 - 22:00:40 EST