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2007-10-15sched: prevent wakeup over-schedulingMike Galbraith3-4/+15
Prevent wakeup over-scheduling. Once a task has been preempted by a task of the same or lower priority, it becomes ineligible for repeated preemption by same until it has been ticked, or slept. Instead, the task is marked for preemption at the next tick. Tasks of higher priority still preempt immediately. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: disable forced preemption by defaultPeter Zijlstra2-12/+16
Implement feature bit to disable forced preemption. This way it can be checked whether a workload is overscheduling or not. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: fix group scheduling for SCHED_BATCHDmitry Adamushko1-3/+2
The following patch (sched: disable sleeper_fairness on SCHED_BATCH) seems to break GROUP_SCHED. Although, it may be 'oops'-less due to the possibility of 'p' being always a valid address. Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: some proc entries are missed in sched_domain sys_ctl debug codeZou Nan hai1-3/+3
cache_nice_tries and flags entry do not appear in proc fs sched_domain directory, because ctl_table entry is skipped. This patch fixes the issue. Signed-off-by: Zou Nan hai <nanhai.zou@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: fix rt ptracer monopolizing CPUGautham R Shenoy1-1/+1
yield() in wait_task_inactive(), can cause a high priority thread to be scheduled back in, and there by loop forever while it is waiting for some lower priority thread which is unfortunately still on the runqueue. Use schedule_timeout_uninterruptible(1) instead. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Credit: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: group scheduling, sysfs tunablesDhaval Giani6-79/+309
Add tunables in sysfs to modify a user's cpu share. A directory is created in sysfs for each new user in the system. /sys/kernel/uids/<uid>/cpu_share Reading this file returns the cpu shares granted for the user. Writing into this file modifies the cpu share for the user. Only an administrator is allowed to modify a user's cpu share. Ex: # cd /sys/kernel/uids/ # cat 512/cpu_share 1024 # echo 2048 > 512/cpu_share # cat 512/cpu_share 2048 # Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: disable sleeper_fairness on SCHED_BATCHPeter Zijlstra1-1/+3
disable sleeper fairness for batch tasks - they are about batch processing after all. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: another wakeup_granularity fixPeter Zijlstra1-2/+5
unit mis-match: wakeup_gran was used against a vruntime Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: export cpu_clock()Paul E. McKenney1-0/+1
export cpu_clock() - the preferred API instead of sched_clock(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: fix: move the CPU check into ->task_new_fair()Ingo Molnar2-5/+3
noticed by Peter Zijlstra: fix: move the CPU check into ->task_new_fair(), this way we can call place_entity() and get child ->vruntime right at initial wakeup time. (without this there can be large latencies) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched: cleanup: function prototype cleanupsIngo Molnar1-10/+5
noticed by Thomas Gleixner: cleanup: function prototype cleanups - move into single line wherever possible. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: cleanup: rename task_grp to task_groupIngo Molnar4-28/+28
cleanup: rename task_grp to task_group. No need to save two characters and 'grp' is annoying to read. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: cleanup: rename SCHED_FEAT_USE_TREE_AVG to SCHED_FEAT_TREE_AVGIngo Molnar2-3/+3
cleanup: rename SCHED_FEAT_USE_TREE_AVG to SCHED_FEAT_TREE_AVG, to make SCHED_FEAT_ names more consistent. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: kfree(NULL) is validIngo Molnar1-8/+5
kfree(NULL) is valid. pointed out by checkpatch.pl. the fix shrinks the code a bit: text data bss dec hex filename 40024 3842 100 43966 abbe sched.o.before 40002 3842 100 43944 aba8 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: style cleanupIngo Molnar1-1/+1
fix up __setup() style bug - noticed via checkpatch.pl. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: break out if printing a warning in sched_domain_debug()Ingo Molnar1-0/+3
checkpatch.pl and Andy Whitcroft noticed the following bug: we did not break out after printing an error. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: run sched_domain_debug() if CONFIG_SCHED_DEBUG=yIngo Molnar1-2/+1
run sched_domain_debug() if CONFIG_SCHED_DEBUG=y, instead of relying on the hand-crafted SCHED_DOMAIN_DEBUG switch. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: cleanup, remove the TASK_NONINTERACTIVE flagMike Galbraith2-4/+2
Here's another piece of low hanging obsolete fruit. Remove obsolete TASK_NONINTERACTIVE. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: cleanup, make dequeue_entity() and update_stats_wait_end() similarDmitry Adamushko1-4/+7
make dequeue_entity() / enqueue_entity() and update_stats_dequeue() / update_stats_enqueue() look similar, structure-wise. zero effect, functionality-wise: text data bss dec hex filename 34550 3026 100 37676 932c sched.o.before 34550 3026 100 37676 932c sched.o.after Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: cleanup, remove calc_weighted()Dmitry Adamushko1-11/+0
remove obsolete code -- calc_weighted() Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: tidy up SCHED_RRDmitry Adamushko2-25/+18
- make timeslices of SCHED_RR tasks constant and not dependent on task's static_prio [1] ; - remove obsolete code (timeslice related bits); - make sched_rr_get_interval() return something more meaningful [2] for SCHED_OTHER tasks. [1] according to the following link, it's not compliant with SUSv3 (not sure though, what is the reference for us :-) http://lkml.org/lkml/2007/3/7/656 [2] the interval is dynamic and can be depicted as follows "should a task be one of the runnable tasks at this particular moment, it would expect to run for this interval of time before being re-scheduled by the scheduler tick". (i.e. it's more precise if a task is runnable at the moment) yeah, this seems to require task_rq_lock/unlock() but this is not a hot path. results: (SCHED_FIFO) dimm@earth:~/storage/prog$ sudo chrt -f 10 ./rr_interval time_slice: 0 : 0 (SCHED_RR) dimm@earth:~/storage/prog$ sudo chrt 10 ./rr_interval time_slice: 0 : 99984800 (SCHED_NORMAL) dimm@earth:~/storage/prog$ ./rr_interval time_slice: 0 : 19996960 (SCHED_NORMAL + a cpu_hog of similar 'weight' on the same CPU --- so should be a half of the previous result) dimm@earth:~/storage/prog$ taskset 1 ./rr_interval time_slice: 0 : 9998480 Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: uninline schedulerAlexey Dobriyan3-24/+24
* save ~300 bytes * activate_idle_task() was moved to avoid a warning bloat-o-meter output: add/remove: 6/0 grow/shrink: 0/16 up/down: 438/-733 (-295) <=== function old new delta __enqueue_entity - 165 +165 finish_task_switch - 110 +110 update_curr_rt - 79 +79 __load_balance_iterator - 32 +32 __task_rq_unlock - 28 +28 find_process_by_pid - 24 +24 do_sched_setscheduler 133 123 -10 sys_sched_rr_get_interval 176 165 -11 sys_sched_getparam 156 145 -11 normalize_rt_tasks 482 470 -12 sched_getaffinity 112 99 -13 sys_sched_getscheduler 86 72 -14 sched_setaffinity 226 212 -14 sched_setscheduler 666 642 -24 load_balance_start_fair 33 9 -24 load_balance_next_fair 33 9 -24 dequeue_task_rt 133 67 -66 put_prev_task_rt 97 28 -69 schedule_tail 133 50 -83 schedule 682 594 -88 enqueue_entity 499 366 -133 task_new_fair 317 180 -137 Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: tweak wakeup granularityIngo Molnar1-4/+4
tweak wakeup granularity. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: optimize schedule() a bit on SMPIngo Molnar1-2/+6
optimize schedule() a bit on SMP, by moving the rq-clock update outside the rq lock. code size is the same: text data bss dec hex filename 25725 2666 96 28487 6f47 sched.o.before 25725 2666 96 28487 6f47 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: fix __pick_next_entity()Dmitry Adamushko1-2/+5
The thing is that __pick_next_entity() must never be called when first_fair(cfs_rq) == NULL. It wouldn't be a problem, should 'run_node' be the very first field of 'struct sched_entity' (and it's the second). The 'nr_running != 0' check is _not_ enough, due to the fact that 'current' is not within the tree. Generic paths are ok (e.g. schedule() as put_prev_task() is called previously)... I'm more worried about e.g. migration_call() -> CPU_DEAD_FROZEN -> migrate_dead_tasks()... if 'current' == rq->idle, no problems.. if it's one of the SCHED_NORMAL tasks (or imagine, some other use-cases in the future -- i.e. we should not make outer world dependent on internal details of sched_fair class) -- it may be "Houston, we've got a problem" case. it's +16 bytes to the ".text". Another variant is to make 'run_node' the first data member of 'struct sched_entity' but an additional check (se ! = NULL) is still needed in pick_next_entity(). Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: vslice fixups for non-0 nice levelsIngo Molnar1-13/+40
Make vslice accurate wrt nice levels, and add some comments while we're at it. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: whitespace cleanupsIngo Molnar1-26/+26
more whitespace cleanups. No code changed: text data bss dec hex filename 26553 2790 288 29631 73bf sched.o.before 26553 2790 288 29631 73bf sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: mark scheduling classes as constIngo Molnar5-19/+13
mark scheduling classes as const. The speeds up the code a bit and shrinks it: text data bss dec hex filename 40027 4018 292 44337 ad31 sched.o.before 40190 3842 292 44324 ad24 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: group scheduler, fix latencySrivatsa Vaddagiri1-0/+2
There is a possibility that because of task of a group moving from one cpu to another, it may gain more cpu time that desired. See http://marc.info/?l=linux-kernel&m=119073197730334 for details. This is an attempt to fix that problem. Basically it simulates dequeue of higher level entities as if they are going to sleep. Similarly it simulate wakeup of higher level entities as if they are waking up from sleep. Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: group scheduler, fix bloatSrivatsa Vaddagiri1-18/+25
Recent fix to check_preempt_wakeup() to check for preemption at higher levels caused a size bloat for !CONFIG_FAIR_GROUP_SCHED. Fix the problem. 42277 10598 320 53195 cfcb kernel/sched.o-before_this_patch 42216 10598 320 53134 cf8e kernel/sched.o-after_this_patch Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: group scheduler, fix coding style issuesSrivatsa Vaddagiri2-13/+9
Fix coding style issues reported by Randy Dunlap and others Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: cleanup, remove stale commentIngo Molnar1-1/+0
cleanup, remove stale comment. Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: speed up and simplify vslice calculationsPeter Zijlstra4-14/+14
speed up and simplify vslice calculations. [ From: Mike Galbraith <efault@gmx.de>: build fix ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: clean up min_vruntime usePeter Zijlstra1-11/+15
clean up min_vruntime use. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: group scheduler SMP migration fixSrivatsa Vaddagiri1-1/+4
group scheduler SMP migration fix: use task_cfs_rq(p) to get to the relevant fair-scheduling runqueue of a task, rq->cfs is not the right one. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: clean up schedstats, cnt -> countIngo Molnar6-36/+36
rename all 'cnt' fields and variables to the less yucky 'count' name. yuckage noticed by Andrew Morton. no change in code, other than the /proc/sched_debug bkl_count string got a bit larger: text data bss dec hex filename 38236 3506 24 41766 a326 sched.o.before 38240 3506 24 41770 a32a sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: yield fixDmitry Adamushko1-20/+5
fix yield bugs due to the current-not-in-rbtree changes: the task is not in the rbtree so rbtree-removal is a no-no. [ From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>: build fix. ] also, nice code size reduction: kernel/sched.o: text data bss dec hex filename 38323 3506 24 41853 a37d sched.o.before 38236 3506 24 41766 a326 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: group scheduler wakeup latency fixSrivatsa Vaddagiri1-5/+16
group scheduler wakeup latency fix: when checking for preemption we must check cross-group too, not just intra-group. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-15sched: remove set_leftmost()Ingo Molnar1-12/+2
Lee Schermerhorn noticed that set_leftmost() contains dead code, remove this. Reported-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: clean up sched_fork()Hiroshi Shimamoto1-5/+2
The adjusting sched_class is a missing part of the already existing "do not leak PI boosting priority to the child" at the sched_fork(). This patch moves the adjusting sched_class from wake_up_new_task() to sched_fork(). this also shrinks the code a bit: text data bss dec hex filename 40111 4018 292 44421 ad85 sched.o.before 40102 4018 292 44412 ad7c sched.o.after Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: max_vruntime() simplificationPeter Zijlstra1-2/+2
max_vruntime() simplification. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched: fix sched_fork()Ingo Molnar1-1/+1
fix sched_fork(): large latencies at new task creation time because the ->vruntime was not fixed up cross-CPU, if the parent got migrated after the child's CPU got set up. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: fix sign check error in place_entity()Ingo Molnar1-1/+1
fix sign check error in place_entity() - we'd get excessive latencies due to negatives being converted to large u64's. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched: undo some of the recent changesIngo Molnar3-12/+3
undo some of the recent changes that are not needed after all, such as last_min_vruntime. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched: remove last_min_vruntime effectIngo Molnar1-1/+1
remove last_min_vruntime use - prepare to remove it. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched: remove condition from set_task_cpu()Ingo Molnar1-3/+1
remove condition from set_task_cpu(). Now that ->vruntime is not global anymore, it should (and does) work fine without it too. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched: entity_key() fixIngo Molnar1-7/+10
entity_key() fix - we'd occasionally end up with a 0 vruntime in the !initial case. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched debug: check spreadPeter Zijlstra3-0/+22
debug feature: check how well we schedule within a reasonable vruntime 'spread' range. (note that CPU overload can increase the spread, so this is not a hard condition, but normal loads should be within the spread.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2007-10-15sched debug: more width for parameter printoutsIngo Molnar1-2/+2
more width for parameter printouts in /proc/sched_debug. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-15sched: add vslicePeter Zijlstra3-15/+32
add vslice: the load-dependent "virtual slice" a task should run ideally, so that the observed latency stays within the sched_latency window. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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