By popular demand, here is release -v24 of the CFS scheduler patch.
It is a full backport of the latest & greatest scheduler code to
v2.6.24-rc3, v2.6.23.8, v2.6.22.13, v2.6.21.7. The patches can be
downloaded from the usual place:
http://people.redhat.com/mingo/cfs-scheduler/
There's tons of changes since v22 was released:
36 files changed, 2359 insertions(+), 1082 deletions(-)
that's 187 individual commits from 32 authors.
So even if CFS v22 worked well for you, please try this release too and
report regressions (if any).
There are countless improvements in -v24 (see the shortlog further below
for details), but here are a few highlights:
- improved interactivity via Peter Ziljstra's "virtual slices" feature.
As load increases, the scheduler shortens the virtual timeslices that
tasks get, so that applications observe the same constant latency for
getting on the CPU. (This goes on until the slices reach a minimum
granularity value)
- CONFIG_FAIR_USER_SCHED is now available across all backported
kernels and the per user weights are configurable via
/sys/kernel/uids/. Group scheduling got refined all around.
- performance improvements
- bugfixes
99% of these changes are already upstream in Linus's git tree and they
will be released as part of v2.6.24. (there are 4 pending commits that
are in the small 2.6.24-rc3-v24 patch.)
As usual, any sort of feedback, bugreport, fix and suggestion is more
than welcome!
Ingo
------------------>
Adrian Bunk (3):
sched: make kernel/sched.c:account_guest_time() static
sched: proper prototype for kernel/sched.c:migration_init()
sched: make sched_nr_latency static
Alexey Dobriyan (1):
sched: uninline scheduler
Andi Kleen (5):
sched: cleanup: remove unnecessary gotos
sched: cleanup: refactor common code of sleep_on / wait_for_completion
sched: cleanup: refactor normalize_rt_tasks
sched: remove stale comment from sched_group_set_shares()
sched: fix return value of wait_for_completion_interruptible()
Arjan van de Ven (1):
Make scheduler debug file operations const
Balbir Singh (1):
sched: fix delay accounting regression
Christian Borntraeger (1):
sched: fix accounting of interrupts during guest execution on s390
Cliff Wickman (1):
hotplug cpu: migrate a task within its cpuset
Dhaval Giani (1):
sched: group scheduling, sysfs tunables
Dmitry Adamushko (16):
sched: clean up struct load_stat
sched: clean up schedstat block in dequeue_entity()
sched: sched_setscheduler() fix
sched: add set_curr_task() calls
sched: do not keep current in the tree and get rid of sched_entity::fair_key
sched: optimize task_new_fair()
sched: simplify sched_class::yield_task()
sched: rework enqueue/dequeue_entity() to get rid of set_curr_task()
sched: yield fix
sched: fix __pick_next_entity()
sched: tidy up SCHED_RR
sched: cleanup, remove calc_weighted()
sched: cleanup, make dequeue_entity() and update_stats_wait_end() similar
sched: fix group scheduling for SCHED_BATCH
sched: fix __set_task_cpu() SMP race
sched: remove activate_idle_task()
Eric Dumazet (1):
sched: cleanup, use NSEC_PER_MSEC and NSEC_PER_SEC
Eugene Teo (1):
Fix tsk->exit_state usage
Gautham R Shenoy (1):
sched: fix rt ptracer monopolizing CPU
Hiroshi Shimamoto (1):
sched: clean up sched_fork()
Ingo Molnar (80):
sched: fix sysctl_sched_child_runs_first flag
sched: resched task in task_new_fair()
sched: small sched_debug cleanup
sched: debug: track maximum 'slice'
sched: uniform tunings
sched: use constants if !CONFIG_SCHED_DEBUG
sched: remove stat_gran
sched: remove precise CPU load
sched: remove precise CPU load calculations #2
sched: track cfs_rq->curr on !group-scheduling too
sched: cleanup: simplify cfs_rq_curr() methods
sched: uninline __enqueue_entity()/__dequeue_entity()
sched: speed up update_load_add/_sub()
sched: clean up calc_weighted()
sched: introduce se->vruntime
sched: move sched_feat() definitions
sched: optimize vruntime based scheduling
sched: simplify check_preempt() methods
sched: wakeup granularity increase
sched: add se->vruntime debugging
sched: remove SCHED_FEAT_SKIP_INITIAL
sched: add more vruntime statistics
sched: debug: update exec_clock only when SCHED_DEBUG
sched: remove wait_runtime limit
sched: remove wait_runtime fields and features
sched: fix delay accounting performance regression
sched: prettify /proc/sched_debug output
sched: enhance debug output
sched: kernel/sched_fair.c whitespace cleanups
sched debug: BKL usage statistics
sched: remove unneeded tunables
sched debug: print settings
sched debug: more width for parameter printouts
sched: entity_key() fix
sched: remove condition from set_task_cpu()
sched: remove last_min_vruntime effect
sched: undo some of the recent changes
sched: fix sign check error in place_entity()
sched: fix sched_fork()
sched: remove set_leftmost()
sched: clean up schedstats, cnt -> count
sched: cleanup, remove stale comment
sched: mark scheduling classes as const
sched: whitespace cleanups
sched: vslice fixups for non-0 nice levels
sched: optimize schedule() a bit on SMP
sched: tweak wakeup granularity
sched: run sched_domain_debug() if CONFIG_SCHED_DEBUG=y
sched: break out if printing a warning in sched_domain_debug()
sched: style cleanup
sched: kfree(NULL) is valid
sched: cleanup: rename SCHED_FEAT_USE_TREE_AVG to SCHED_FEAT_TREE_AVG
sched: cleanup: rename task_grp to task_group
sched: cleanup: function prototype cleanups
sched: fix: move the CPU check into ->task_new_fair()
sched: update comment
sched: clean up is_migration_thread()
sched: do not normalize kernel threads via SysRq-N
sched: do not wakeup-preempt with SCHED_BATCH tasks
sched: speed up context-switches a bit
sched: reintroduce cache-hot affinity
sched: debug: increase width of debug line
sched: debug, improve migration statistics
sched: allow the immediate migration of cache-cold tasks
sched: affine sync wakeups
sched: sync wakeups preempt too
sched: cleanup, fix spacing
sched: cleanup, make struct rq comments more consistent
sched: add KERN_CONT annotation
sched: fix fastcall mismatch in completion APIs
sched: clean up sched_domain_debug()
sched: fix style of swap() macro in kernel/sched_fair.c
sched: fix style in kernel/sched.c
sched: reintroduce SMP tunings again
sched: turn off PREEMPT_RESTRICT
sched: remove PREEMPT_RESTRICT
sched: wakeup preemption fix
sched: clean up the wakeup preempt check
sched: clean up the wakeup preempt check, #2
sched: reorder SCHED_FEAT_ bits
James Bottomley (1):
sched: fix incorrect assumption that cpu 0 exists
Ken Chen (2):
sched: fix improper load balance across sched domain
sched: reduce schedstat variable overhead a bit
Laurent Vivier (2):
sched: guest CPU accounting: maintain stats in account_system_time()
sched: don't clear PF_VCPU in scheduler
Matthias Kaehlcke (1):
sched: use list_for_each_entry_safe() in __wake_up_common()
Michael Neuling (2):
Add scaled time to taskstats based process accounting
kernel/sched.c: remove bogus comment from account_user_time
Mike Galbraith (3):
sched: fix SMP migration latencies
sched: fix formatting of /proc/sched_debug
sched: prevent wakeup over-scheduling
Milton Miller (7):
sched: domain sysctl fixes: use kcalloc()
sched: domain sysctl fixes: use for_each_online_cpu()
sched: domain sysctl fixes: unregister the sysctl table before domains
sched: domain sysctl fixes: do not crash on allocation failure
sched: domain sysctl fixes: add terminator comment
sched: more robust sd-sysctl entry freeing
sched: fix sched_domain sysctl registration again
Oleg Nesterov (3):
do CPU_DEAD migrating under read_lock(tasklist) instead of write_lock_irq(tasklist)
migration_call(CPU_DEAD): use spin_lock_irq() instead of task_rq_lock()
sched: fix SCHED_FIFO tasks & FAIR_GROUP_SCHED
Paul E. McKenney (1):
sched: export cpu_clock()
Paul Jackson (2):
cpuset: remove sched domain hooks from cpusets
cpuset sched_load_balance flag
Paul Menage (4):
Task Control Groups: example CPU accounting subsystem
Fix cpusets update_cpumask
sched: clean up some control group code
sched: report CPU usage in CFS cgroup directories
Pavel Emelyanov (3):
pid namespaces: changes to show virtual ids to user
Uninline find_task_by_xxx set of functions
Use helpers to obtain task pid in printks
Peter Williams (2):
sched: reduce balance-tasks overhead
sched: isolate SMP balancing code a bit more
Peter Zijlstra (21):
sched: simplify SCHED_FEAT_* code
sched: new task placement for vruntime
sched: simplify adaptive latency
sched: clean up new task placement
sched: add tree based averages
sched: handle vruntime 64-bit overflow
sched: better min_vruntime tracking
sched: add vslice
sched debug: check spread
sched: max_vruntime() simplification
sched: clean up min_vruntime use
sched: speed up and simplify vslice calculations
sched: another wakeup_granularity fix
sched: disable sleeper_fairness on SCHED_BATCH
sched: disable forced preemption by default
sched: activate task_hot() only on fair-scheduled tasks
sched: fix unconditional irq lock
sched: fix vslice
sched: documentation: place_entity() comments
sched: reintroduce the sched_min_granularity tunable
sched: avoid large irq-latencies in smp-balancing
S.Caglar Onur (1):
sched debug: BKL usage statistics, fix
Satyam Sharma (1):
sched: use show_regs() to improve __schedule_bug() output
Srivatsa Vaddagiri (16):
sched: group-scheduler core
sched: revert recent removal of set_curr_task()
sched: fix minor bug in yield
sched: print nr_running and load in /proc/sched_debug
sched: print &rq->cfs stats
sched: clean up code under CONFIG_FAIR_GROUP_SCHED
sched: add fair-user scheduler
sched: group scheduler wakeup latency fix
sched: group scheduler SMP migration fix
sched: group scheduler, fix coding style issues
sched: group scheduler, fix bloat
sched: group scheduler, fix latency
sched: fix new task startup crash
Hook up group scheduler with control groups
sched: move rcu_head to task_group struct
sched: fix copy_namespace() <-> sched_fork() dependency in do_fork
Zou Nan hai (1):
sched: some proc entries are missed in sched_domain sys_ctl debug code
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