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* sched: run_rebalance_domains: s/SCHED_IDLE/CPU_IDLE/Oleg Nesterov2007-08-121-1/+1
| | | | | | | | | | rebalance_domains(SCHED_IDLE) looks strange (typo), change it to CPU_IDLE. the effect of this bug was slightly more agressive idle-balancing on SMP than intended. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: make global code staticAdrian Bunk2007-08-121-23/+23
| | | | | | | | | | | | This patch makes the following needlessly global code static: - arch_reinit_sched_domains() - struct attr_sched_mc_power_savings - struct attr_sched_smt_power_savings Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: improve rq-clock overflow logicIngo Molnar2007-08-101-2/+13
| | | | | | | | | | | | improve the rq-clock overflow logic: limit the absolute rq->clock delta since the last scheduler tick, instead of limiting the delta itself. tested by Arjan van de Ven - whole laptop was misbehaving due to an incorrectly calibrated cpu_khz confusing sched_clock(). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
* sched: round a bit betterIngo Molnar2007-08-091-7/+11
| | | | | | | | | round a tiny bit better in high-frequency rescheduling scenarios, by rounding around zero instead of rounding down. (this is pretty theoretical though) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: make the multiplication table more accurateIngo Molnar2007-08-091-13/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | do small deltas in the weight and multiplication constant table so that the worst-case numeric error is better than 1:100000000. (8 digits) the current error table is: nice mult * inv_mult error ------------------------------------------ -20: 88761 * 48388 -0.0000000065 -19: 71755 * 59856 -0.0000000037 -18: 56483 * 76040 0.0000000056 -17: 46273 * 92818 0.0000000042 -16: 36291 * 118348 -0.0000000065 -15: 29154 * 147320 -0.0000000037 -14: 23254 * 184698 -0.0000000009 -13: 18705 * 229616 -0.0000000037 -12: 14949 * 287308 -0.0000000009 -11: 11916 * 360437 -0.0000000009 -10: 9548 * 449829 -0.0000000009 -9: 7620 * 563644 -0.0000000037 -8: 6100 * 704093 0.0000000009 -7: 4904 * 875809 0.0000000093 -6: 3906 * 1099582 -0.0000000009 -5: 3121 * 1376151 -0.0000000058 -4: 2501 * 1717300 0.0000000009 -3: 1991 * 2157191 -0.0000000035 -2: 1586 * 2708050 0.0000000009 -1: 1277 * 3363326 0.0000000014 0: 1024 * 4194304 0.0000000000 1: 820 * 5237765 0.0000000009 2: 655 * 6557202 0.0000000033 3: 526 * 8165337 -0.0000000079 4: 423 * 10153587 0.0000000012 5: 335 * 12820798 0.0000000079 6: 272 * 15790321 0.0000000037 7: 215 * 19976592 -0.0000000037 8: 172 * 24970740 -0.0000000037 9: 137 * 31350126 -0.0000000079 10: 110 * 39045157 -0.0000000061 11: 87 * 49367440 -0.0000000037 12: 70 * 61356676 0.0000000056 13: 56 * 76695844 -0.0000000075 14: 45 * 95443717 -0.0000000072 15: 36 * 119304647 -0.0000000009 16: 29 * 148102320 -0.0000000037 17: 23 * 186737708 -0.0000000028 18: 18 * 238609294 -0.0000000009 19: 15 * 286331153 -0.0000000002 Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: optimize update_rq_clock() calls in the load-balancerIngo Molnar2007-08-091-6/+8
| | | | | | | | optimize update_rq_clock() calls in the load-balancer: update them right after locking the runqueue(s) so that the pull functions do not have to call it. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: optimize activate_task()Ingo Molnar2007-08-091-10/+9
| | | | | | | | optimize activate_task() by removing update_rq_clock() from it. (and add update_rq_clock() to all callsites of activate_task() that did not have it before.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: move the __update_rq_clock() call to scheduler_tick()Ingo Molnar2007-08-091-2/+1
| | | | | | | | | | | move the __update_rq_clock() call from update_cpu_load() to scheduler_tick(). ( identity transformation that causes no change in functionality. ) this allows the direct use of rq->clock in ->task_tick() functions. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' local variablesIngo Molnar2007-08-091-16/+0
| | | | | | | | final step: remove all (now superfluous) 'u64 now' variables. ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from deactivate_task()Ingo Molnar2007-08-091-8/+7
| | | | | | | | remove the 'u64 now' parameter from deactivate_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from dequeue_task()Ingo Molnar2007-08-091-5/+4
| | | | | | | | remove the 'u64 now' parameter from dequeue_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from enqueue_task()Ingo Molnar2007-08-091-6/+5
| | | | | | | | remove the 'u64 now' parameter from enqueue_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from dec_nr_running()Ingo Molnar2007-08-091-2/+2
| | | | | | | | remove the 'u64 now' parameter from dec_nr_running(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from inc_nr_running()Ingo Molnar2007-08-091-4/+4
| | | | | | | | remove the 'u64 now' parameter from inc_nr_running(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from dec_load()Ingo Molnar2007-08-091-4/+3
| | | | | | | | remove the 'u64 now' parameter from dec_load(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from inc_load()Ingo Molnar2007-08-091-4/+3
| | | | | | | | remove the 'u64 now' parameter from inc_load(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from update_curr_load()Ingo Molnar2007-08-091-4/+4
| | | | | | | | remove the 'u64 now' parameter from update_curr_load(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from ->task_new()Ingo Molnar2007-08-091-1/+1
| | | | | | | | remove the 'u64 now' parameter from ->task_new(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from ->put_prev_task()Ingo Molnar2007-08-091-1/+1
| | | | | | | | remove the 'u64 now' parameter from ->put_prev_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from pick_next_task()Ingo Molnar2007-08-091-3/+3
| | | | | | | | remove the 'u64 now' parameter from pick_next_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from ->pick_next_task()Ingo Molnar2007-08-091-2/+2
| | | | | | | | remove the 'u64 now' parameter from ->pick_next_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from ->dequeue_task()Ingo Molnar2007-08-091-1/+1
| | | | | | | | remove the 'u64 now' parameter from ->dequeue_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove the 'u64 now' parameter from ->enqueue_task()Ingo Molnar2007-08-091-1/+1
| | | | | | | | remove the 'u64 now' parameter from ->enqueue_task(). ( identity transformation that causes no change in functionality. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove 'now' use from assignmentsIngo Molnar2007-08-091-4/+4
| | | | | | | | | | change all 'now' timestamp uses in assignments to rq->clock. ( this is an identity transformation that causes no functionality change: all such new rq->clock is necessarily preceded by an update_rq_clock() call. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove __rq_clock()Ingo Molnar2007-08-091-7/+0
| | | | | | remove the (now unused) __rq_clock() function. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: eliminate __rq_clock() useIngo Molnar2007-08-091-2/+6
| | | | | | | | | | | eliminate __rq_clock() use by changing it to: __update_rq_clock(rq) now = rq->clock; identity transformation - no change in behavior. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove rq_clock()Ingo Molnar2007-08-091-6/+0
| | | | | | remove the now unused rq_clock() function. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: eliminate rq_clock() useIngo Molnar2007-08-091-15/+34
| | | | | | | | | | | eliminate rq_clock() use by changing it to: update_rq_clock(rq) now = rq->clock; identity transformation - no change in behavior. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: add [__]update_rq_clock(rq)Ingo Molnar2007-08-091-8/+22
| | | | | | | | add the [__]update_rq_clock(rq) functions. (No change in functionality, just reorganization to prepare for elimination of the heavy 64-bit timestamp-passing in the scheduler.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: fix bug in balance_tasks()Peter Williams2007-08-091-15/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are two problems with balance_tasks() and how it used: 1. The variables best_prio and best_prio_seen (inherited from the old move_tasks()) were only required to handle problems caused by the active/expired arrays, the order in which they were processed and the possibility that the task with the highest priority could be on either. These issues are no longer present and the extra overhead associated with their use is unnecessary (and possibly wrong). 2. In the absence of CONFIG_FAIR_GROUP_SCHED being set, the same this_best_prio variable needs to be used by all scheduling classes or there is a risk of moving too much load. E.g. if the highest priority task on this at the beginning is a fairly low priority task and the rt class migrates a task (during its turn) then that moved task becomes the new highest priority task on this_rq but when the sched_fair class initializes its copy of this_best_prio it will get the priority of the original highest priority task as, due to the run queue locks being held, the reschedule triggered by pull_task() will not have taken place. This could result in inappropriate overriding of skip_for_load and excessive load being moved. The attached patch addresses these problems by deleting all reference to best_prio and best_prio_seen and making this_best_prio a reference parameter to the various functions involved. load_balance_fair() has also been modified so that this_best_prio is only reset (in the loop) if CONFIG_FAIR_GROUP_SCHED is set. This should preserve the effect of helping spread groups' higher priority tasks around the available CPUs while improving system performance when CONFIG_FAIR_GROUP_SCHED isn't set. Signed-off-by: Peter Williams <pwil3058@bigpond.net.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove binary sysctls from kernel.sched_domainAlexey Dobriyan2007-08-091-17/+21
| | | | | | | | | kernel.sched_domain hierarchy is under CTL_UNNUMBERED and thus unreachable to sysctl(2). Generating .ctl_number's in such situation is not useful. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: schedule() speedupIngo Molnar2007-08-091-10/+9
| | | | | | | | | | speed up schedule(): share the 'now' parameter that deactivate_task() was calculating internally. ( this also fixes the small accounting window between the deactivate call and the pick_next_task() call. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: uninline rq_clock()Ingo Molnar2007-08-091-1/+1
| | | | | | | | | | uninline rq_clock() to save 263 bytes of code: text data bss dec hex filename 39561 3642 24 43227 a8db sched.o.before 39298 3642 24 42964 a7d4 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up sched_getaffinity()Ulrich Drepper2007-08-091-3/+1
| | | | | | | | | here's another tiny cleanup. The generated code is not affected (gcc is smart enough) but for people looking over the code it is just irritating to have the extra conditional. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: simplify move_tasks()Peter Williams2007-08-091-36/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The move_tasks() function is currently multiplexed with two distinct capabilities: 1. attempt to move a specified amount of weighted load from one run queue to another; and 2. attempt to move a specified number of tasks from one run queue to another. The first of these capabilities is used in two places, load_balance() and load_balance_idle(), and in both of these cases the return value of move_tasks() is used purely to decide if tasks/load were moved and no notice of the actual number of tasks moved is taken. The second capability is used in exactly one place, active_load_balance(), to attempt to move exactly one task and, as before, the return value is only used as an indicator of success or failure. This multiplexing of sched_task() was introduced, by me, as part of the smpnice patches and was motivated by the fact that the alternative, one function to move specified load and one to move a single task, would have led to two functions of roughly the same complexity as the old move_tasks() (or the new balance_tasks()). However, the new modular design of the new CFS scheduler allows a simpler solution to be adopted and this patch addresses that solution by: 1. adding a new function, move_one_task(), to be used by active_load_balance(); and 2. making move_tasks() a single purpose function that tries to move a specified weighted load and returns 1 for success and 0 for failure. One of the consequences of these changes is that neither move_one_task() or the new move_tasks() care how many tasks sched_class.load_balance() moves and this enables its interface to be simplified by returning the amount of load moved as its result and removing the load_moved pointer from the argument list. This helps simplify the new move_tasks() and slightly reduces the amount of work done in each of sched_class.load_balance()'s implementations. Further simplification, e.g. changes to balance_tasks(), are possible but (slightly) complicated by the special needs of load_balance_fair() so I've left them to a later patch (if this one gets accepted). NB Since move_tasks() gets called with two run queue locks held even small reductions in overhead are worthwhile. [ mingo@elte.hu ] this change also reduces code size nicely: text data bss dec hex filename 39216 3618 24 42858 a76a sched.o.before 39173 3618 24 42815 a73f sched.o.after Signed-off-by: Peter Williams <pwil3058@bigpond.net.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: reorder update_cpu_load(rq) with the ->task_tick() callIngo Molnar2007-08-091-1/+1
| | | | | | | | | Peter Williams suggested to flip the order of update_cpu_load(rq) with the ->task_tick() call. This is a NOP for the current scheduler (the two functions are independent of each other), ->task_tick() might create some state for update_cpu_load() in the future (or in PlugSched). Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: reduce debug codeIngo Molnar2007-08-021-10/+18
| | | | | | | | | | | move the rest of the debugging/instrumentation code to under CONFIG_SCHEDSTATS too. This reduces code size and speeds code up: text data bss dec hex filename 33044 4122 28 37194 914a sched.o.before 32708 4122 28 36858 8ffa sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: move load-calculation functionsIngo Molnar2007-08-021-66/+66
| | | | | | | move load-calculation functions so that they can use the per-policy declarations and methods. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: ->task_new cleanupIngo Molnar2007-08-021-3/+8
| | | | | | | make sched_class.task_new == NULL a 'default method', this allows the removal of task_rt_new. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: uninline inc/dec_nr_running()Ingo Molnar2007-08-021-2/+2
| | | | | | | | | | uninline inc_nr_running() and dec_nr_running(): text data bss dec hex filename 29039 4162 24 33225 81c9 sched.o.before 29027 4162 24 33213 81bd sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: uninline calc_delta_mine()Ingo Molnar2007-08-021-1/+1
| | | | | | | | | | uninline calc_delta_mine(): text data bss dec hex filename 29162 4162 24 33348 8244 sched.o.before 29039 4162 24 33225 81c9 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: calc_delta_mine(): use fixed limitIngo Molnar2007-08-021-1/+1
| | | | | | use fixed limit in calc_delta_mine() - this saves an instruction :) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: tidy up left over smpnice codePeter Williams2007-08-021-15/+1
| | | | | | | | | | | | | | | | | 1. The only place that RTPRIO_TO_LOAD_WEIGHT() is used is in the call to move_tasks() in the function active_load_balance() and its purpose here is just to make sure that the load to be moved is big enough to ensure that exactly one task is moved (if there's one available). This can be accomplished by using ULONG_MAX instead and this allows RTPRIO_TO_LOAD_WEIGHT() to be deleted. 2. This, in turn, allows PRIO_TO_LOAD_WEIGHT() to be deleted. 3. This allows load_weight() to be deleted which allows TIME_SLICE_NICE_ZERO to be deleted along with the comment above it. Signed-off-by: Peter Williams <pwil3058@bigpond.net.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: remove cache_hot_timeIngo Molnar2007-08-021-2/+0
| | | | | | remove the last unused remains of cache_hot_time. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: fix kernel-doc warningsRandy Dunlap2007-07-311-2/+4
| | | | | | | | | | | | | Fix kernel-doc warnings in sched.c: Warning(linux-2623-rc1g4//kernel/sched.c:1685): No description found for parameter 'notifier' Warning(linux-2623-rc1g4//kernel/sched.c:1696): No description found for parameter 'notifier' Warning(linux-2623-rc1g4//kernel/sched.c:1750): No description found for parameter 'prev' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] sched: debug feature - make the sched-domains tree runtime-tweakableNick Piggin2007-07-261-0/+122
| | | | | | | | debugging feature: make the sched-domains tree runtime-tweakable. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> [ mingo@elte.hu: made it depend on CONFIG_SCHED_DEBUG & small updates ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: make cpu_clock() not use the rq clockIngo Molnar2007-07-261-4/+3
| | | | | | | | | | | it is enough to disable interrupts to get the precise rq-clock of the local CPU. this also solves an NMI watchdog regression: the NMI watchdog calls touch_softlockup_watchdog(), which might deadlock on rq->lock if the NMI hits an rq-locked critical section. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: remove unused rq->load_balance_classSatoru Takeuchi2007-07-261-2/+0
| | | | | | | Remove unused rq->load_balance_class. Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: arch preempt notifier mechanismAvi Kivity2007-07-261-2/+71
| | | | | | | | | | | This adds a general mechanism whereby a task can request the scheduler to notify it whenever it is preempted or scheduled back in. This allows the task to swap any special-purpose registers like the fpu or Intel's VT registers. Signed-off-by: Avi Kivity <avi@qumranet.com> [ mingo@elte.hu: fixes, cleanups ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [PATCH] sched: implement cpu_clock(cpu) high-speed time sourceIngo Molnar2007-07-191-0/+17
| | | | | | | | | | | Implement the cpu_clock(cpu) interface for kernel-internal use: high-speed (but slightly incorrect) per-cpu clock constructed from sched_clock(). This API, unused at the moment, will be used in the future by blktrace, by the softlockup-watchdog, by printk and by lockstat. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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