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sched: Ditch per cgroup task lists for load-balancing

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Per cgroup load-balance has numerous problems, chief amongst them that
there is no real sane order in them. So stop pretending it makes sense
and enqueue all tasks on a single list.

This also allows us to more easily fix the fwd progress issue
uncovered by the lock-break stuff. Rotate the list on failure to
migreate and limit the total iterations to nr_running (which with
releasing the lock isn't strictly accurate but close enough).

Also add a filter that skips very light tasks on the first attempt
around the list, this attempts to avoid shooting whole cgroups around
without affecting over balance.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: pjt@google.com
Link: http://lkml.kernel.org/n/tip-tx8yqydc7eimgq7i4rkc3a4g@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2012-02-20 21:49:09 +01:00
committed by Ingo Molnar
parent ddcdf6e7d9
commit 367456c756
3 changed files with 80 additions and 109 deletions
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10
kernel/sched/sched.h
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@ -212,9 +212,6 @@ struct cfs_rq {
struct rb_root tasks_timeline;
struct rb_node *rb_leftmost;
struct list_head tasks;
struct list_head *balance_iterator;
/*
* 'curr' points to currently running entity on this cfs_rq.
* It is set to NULL otherwise (i.e when none are currently running).
@ -241,11 +238,6 @@ struct cfs_rq {
struct task_group *tg; /* group that "owns" this runqueue */
#ifdef CONFIG_SMP
/*
* the part of load.weight contributed by tasks
*/
unsigned long task_weight;
/*
* h_load = weight * f(tg)
*
@ -420,6 +412,8 @@ struct rq {
int cpu;
int online;
struct list_head cfs_tasks;
u64 rt_avg;
u64 age_stamp;
u64 idle_stamp;