- 15 Oct, 2007 40 commits
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Srivatsa Vaddagiri authored
Enable user-id based fair group scheduling. This is useful for anyone who wants to test the group scheduler w/o having to enable CONFIG_CGROUPS. A separate scheduling group (i.e struct task_grp) is automatically created for every new user added to the system. Upon uid change for a task, it is made to move to the corresponding scheduling group. A /proc tunable (/proc/root_user_share) is also provided to tune root user's quota of cpu bandwidth. 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> Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by:
Thomas Gleixner <tglx@linutronix.de>
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Srivatsa Vaddagiri authored
With the view of supporting user-id based fair scheduling (and not just container-based fair scheduling), this patch renames several functions and makes them independent of whether they are being used for container or user-id based fair scheduling. Also fix a problem reported by KAMEZAWA Hiroyuki (wrt allocating less-sized array for tg->cfs_rq[] and tf->se[]). Signed-off-by:
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Srivatsa Vaddagiri authored
- Print &rq->cfs statistics as well (useful for group scheduling) Signed-off-by:
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Srivatsa Vaddagiri authored
- print nr_running and load information for cfs_rq in /proc/sched_debug Signed-off-by:
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Srivatsa Vaddagiri authored
- fix a minor bug in yield (seen for CONFIG_FAIR_GROUP_SCHED), group scheduling would skew when yield was called. Signed-off-by:
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Srivatsa Vaddagiri authored
Revert removal of set_curr_task. Use put_prev_task/set_curr_task when changing groups/policies Signed-off-by: Srivatsa Vaddagiri < vatsa@linux.vnet.ibm.com> Signed-off-by:
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Ingo Molnar authored
some trivial whitespace cleanups. Signed-off-by:
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Mike Galbraith authored
fix formatting of /proc/sched_debug Signed-off-by:
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Ingo Molnar authored
enhance debug output by changing 12345678 nsecs to 12.345678 output, this is more human-readable. Signed-off-by:
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Ingo Molnar authored
print the correct amount of dashes in /proc/sched_debug. Signed-off-by:
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Dmitry Adamushko authored
rework enqueue/dequeue_entity() to get rid of sched_class::set_curr_task(). This simplifies sched_setscheduler(), rt_mutex_setprio() and sched_move_tasks(). text data bss dec hex filename 24330 2734 20 27084 69cc sched.o.before 24233 2730 20 26983 6967 sched.o.after Signed-off-by:
Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by:
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Dmitry Adamushko authored
the 'p' (task_struct) parameter in the sched_class :: yield_task() is redundant as the caller is always the 'current'. Get rid of it. text data bss dec hex filename 24341 2734 20 27095 69d7 sched.o.before 24330 2734 20 27084 69cc sched.o.after Signed-off-by:
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Dmitry Adamushko authored
due to the fact that we no longer keep the 'current' within the tree, dequeue/enqueue_entity() is useless for the 'current' in task_new_fair(). We are about to reschedule and sched_class->put_prev_task() will put the 'current' back into the tree, based on its new key. text data bss dec hex filename 24388 2734 20 27142 6a06 sched.o.before 24341 2734 20 27095 69d7 sched.o.after Signed-off-by:
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Ingo Molnar authored
fix delay accounting performance regression - those sched_clock() calls are not needed. Signed-off-by:
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Dmitry Adamushko authored
Get rid of 'sched_entity::fair_key'. As a side effect, 'current' is not kept withing the tree for SCHED_NORMAL/BATCH tasks anymore. This simplifies some parts of code (e.g. entity_tick() and yield_task_fair()) and also somewhat optimizes them (e.g. a single update_curr() now vs. dequeue/enqueue() before in entity_tick()). Signed-off-by:
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Dmitry Adamushko authored
p->sched_class->set_curr_task() has to be called before activate_task()/enqueue_task() in rt_mutex_setprio(), sched_setschedule() and sched_move_task() in order to set up 'cfs_rq->curr'. The logic of enqueueing depends on whether a task to be inserted is 'current' or not. Signed-off-by:
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Dmitry Adamushko authored
Fix a problem in the 'sched-group' patch for !CONFIG_FAIR_GROUP_SCHED. description: sched_setscheduler() { ... if (task_running()) p->sched_class->put_prev_entity(); [ this one sets up cfs_rq->curr to NULL ] ... if (task_running) p->sched_class->set_curr_task(); [ and this one is a _NOP_ (empty) for !CONFIG_FAIR_GROUP_SCHED ] As a result, the task continues to run with cfs_rq->curr == NULL... no crashes (due to checks for !NULL in place) but e.g. update_curr() effectively becomes a NOP... i.e. runtime statistics for this task is not accounted untill it's rescheduled anew. Signed-off-by: -
Srivatsa Vaddagiri authored
Add interface to control cpu bandwidth allocation to task-groups. (not yet configurable, due to missing CONFIG_CONTAINERS) Signed-off-by:
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Mike Galbraith authored
fix SMP migration latencies: the vruntimes of different CPUs are at incompatible offsets so they have to be fixed up when migrating a task across CPUs. Signed-off-by:
Mike Galbraith <efault@gmx.de> Signed-off-by:
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Peter Zijlstra authored
Better min_vruntime tracking: update it every time 'curr' is updated - not just when a task is enqueued into the tree. Signed-off-by:
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Ingo Molnar authored
sched.o gets smaller and faster if we compile it with -fomit-frame-pointers, so make this a config option. The cost is the loss of multi-depth wchan lookups - but SysRq-T is a sufficient replacement for them anyway, so their utility is much lower these days. the size difference is significant: text data bss dec hex filename 34005 3462 24 37491 9273 sched.o.before 33470 3462 24 36956 905c sched.o.after Signed-off-by:
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Dmitry Adamushko authored
Better placement of #ifdef CONFIG_SCHEDSTAT block in dequeue_entity(). Signed-off-by:
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Ingo Molnar authored
remove wait_runtime based fields and features, now that the CFS math has been changed over to the vruntime metric. Signed-off-by:
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Ingo Molnar authored
remove the wait_runtime-limit fields and the code depending on it, now that the math has been changed over to rely on the vruntime metric. Signed-off-by:
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Dmitry Adamushko authored
'struct load_stat' is redundant now so let's get rid of it. Signed-off-by:
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Ingo Molnar authored
micro-optimization: update cfs_rq->exec_clock only if CONFIG_SCHED_DEBUG=y. Signed-off-by:
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Ingo Molnar authored
add more vruntime statistics. Signed-off-by:
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Peter Zijlstra authored
Handle vruntime overflow by centering the key space around min_vruntime. ( otherwise we could overflow 64-bit vruntime in a few days with SCHED_IDLE tasks - or in a few years with nice +19. ) Signed-off-by:
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Peter Zijlstra authored
add support for tree based vruntime averages. Signed-off-by:
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Ingo Molnar authored
remove SCHED_FEAT_SKIP_INITIAL - it was off by default and even when enabled it never made any real difference. Signed-off-by:
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Ingo Molnar authored
debug se->vruntime fields. Signed-off-by:
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Peter Zijlstra authored
clean up new task placement. Signed-off-by:
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Ingo Molnar authored
increase wakeup granularity - we were overscheduling a bit. Signed-off-by:
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Ingo Molnar authored
simplify the check_preempt() methods. Signed-off-by:
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Peter Zijlstra authored
simplify adaptive latency. Signed-off-by:
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Peter Zijlstra authored
add proper new task placement for the vruntime based math too. ( note: introduces a swap() macro, but the swap token is too widely used in the kernel namespace for a generic version to be added without changing non-scheduler code - so this cleanup will be done separately. ) Signed-off-by:
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Ingo Molnar authored
optimize vruntime based scheduling. Signed-off-by:
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Ingo Molnar authored
move sched_feat() definitions so that it can be used sooner by generic code too. Signed-off-by:
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Ingo Molnar authored
introduce se->vruntime as a sum of weighted delta-exec's, and use that as the key into the tree. the idea to use absolute virtual time as the basic metric of scheduling has been first raised by William Lee Irwin, advanced by Tong Li and first prototyped by Roman Zippel in the "Really Fair Scheduler" (RFS) patchset. also see: http://lkml.org/lkml/2007/9/2/76 for a simpler variant of this patch. Signed-off-by:
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Ingo Molnar authored
clean up calc_weighted() - we always use the normalized shift so it's not needed to pass that in. Also, push the non-nice0 branch into the function. Signed-off-by:
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