Linus, please pull the latest scheduler git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
It includes 8 commits, 3 of which are important: the most important
change is a bugfix to the new task startup penalty code. This could
explain the task-startup unpredictability problem reported by Al Boldi.
Then there's also a change/tweak that increases the default granularity:
it's still well below human perception so should not be noticeable, but
servers win a bit from less preemption of CPU-bound tasks. (this is also
the first step towards eliminating HZ from the granularity default
calculation.)
Plus a bonus balance inconsistency has been fixed: the previous logic
was slightly inflatory of sleeper wait-runtime, without a
counter-balance on runners. (I found no noticeable or measurable impact,
other than a ~5% improvement in hackbench performance [due to less
preemption scheduling] and a slightly nicer looking /proc/sched_debug
output when there are lots of sleepers.)
Five other, low-impact changes: a group-scheduling fixlet from Bruce
Ashfield, two nice simplifications from Peter Zijlstra to the
bonus-balance code (which eliminate a 64-bit multiplication and shrink
the code), a QOI improvement from Dmitry Adamushko to RR RT task
preemption [not strictly required for .23 but this has been in my tree
for some time already with no ill effects and the code is obviously
correct] and a dead code elimination fix from Sven-Thorsten Dietrich.
Test-built and test-booted on x86-32 and x86-64, and it passed a few
dozen "make randconfig" builds as well.
Ingo
------------------>
Bruce Ashfield (1):
sched: CONFIG_SCHED_GROUP_FAIR=y fixlet
Dmitry Adamushko (1):
sched: optimize task_tick_rt() a bit
Ingo Molnar (3):
sched: increase default granularity a bit
sched: tidy up and simplify the bonus balance
sched: fix startup penalty calculation
Peter Zijlstra (2):
sched: simplify bonus calculation #1
sched: simplify bonus calculation #2
Sven-Thorsten Dietrich (1):
sched: simplify can_migrate_task()
sched.c | 6 ------
sched_fair.c | 26 +++++++++++++++-----------
sched_rt.c | 11 ++++++++---
3 files changed, 23 insertions(+), 20 deletions(-)
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