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author | Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> | 2008-01-25 20:08:00 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 20:08:00 (GMT) |
commit | 58e2d4ca581167c2a079f4ee02be2f0bc52e8729 (patch) | |
tree | 9a8c8324785800f3577fb897ca3e2ae21ad8c55a /kernel/sched.c | |
parent | ec2c507fe8c8fa3c04fc6cb99a382a965c477379 (diff) | |
download | linux-fsl-qoriq-58e2d4ca581167c2a079f4ee02be2f0bc52e8729.tar.xz |
sched: group scheduling, change how cpu load is calculated
This patch changes how the cpu load exerted by fair_sched_class tasks
is calculated. Load exerted by fair_sched_class tasks on a cpu is now
a summation of the group weights, rather than summation of task weights.
Weight exerted by a group on a cpu is dependent on the shares allocated
to it.
This version of patch has a minor impact on code size, but should have
no runtime/functional impact for !CONFIG_FAIR_GROUP_SCHED.
Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r-- | kernel/sched.c | 27 |
1 files changed, 11 insertions, 16 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index cfa6958..c915f3e 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -886,6 +886,16 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime); static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {} #endif +static inline void inc_cpu_load(struct rq *rq, unsigned long load) +{ + update_load_add(&rq->load, load); +} + +static inline void dec_cpu_load(struct rq *rq, unsigned long load) +{ + update_load_sub(&rq->load, load); +} + #include "sched_stats.h" #include "sched_idletask.c" #include "sched_fair.c" @@ -896,26 +906,14 @@ static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {} #define sched_class_highest (&rt_sched_class) -static inline void inc_load(struct rq *rq, const struct task_struct *p) -{ - update_load_add(&rq->load, p->se.load.weight); -} - -static inline void dec_load(struct rq *rq, const struct task_struct *p) -{ - update_load_sub(&rq->load, p->se.load.weight); -} - static void inc_nr_running(struct task_struct *p, struct rq *rq) { rq->nr_running++; - inc_load(rq, p); } static void dec_nr_running(struct task_struct *p, struct rq *rq) { rq->nr_running--; - dec_load(rq, p); } static void set_load_weight(struct task_struct *p) @@ -4087,10 +4085,8 @@ void set_user_nice(struct task_struct *p, long nice) goto out_unlock; } on_rq = p->se.on_rq; - if (on_rq) { + if (on_rq) dequeue_task(rq, p, 0); - dec_load(rq, p); - } p->static_prio = NICE_TO_PRIO(nice); set_load_weight(p); @@ -4100,7 +4096,6 @@ void set_user_nice(struct task_struct *p, long nice) if (on_rq) { enqueue_task(rq, p, 0); - inc_load(rq, p); /* * If the task increased its priority or is running and * lowered its priority, then reschedule its CPU: |