[PATCH RFC 2/3] sched/fair: copy taskgroup shares to each cfs_rq

[Konstantin Khlebnikov]

This will be used for tweaking shares in runtime.

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
---
 kernel/sched/fair.c  |   12 +++++++-----
 kernel/sched/sched.h |    1 +
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d26b631a9a1d..5bf34532d364 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2469,21 +2469,21 @@ static long calc_cfs_shares(struct cfs_rq *cfs_rq, 
struct task_group *tg)
        tg_weight = calc_tg_weight(tg, cfs_rq);
        load = cfs_rq->load.weight;
 
-       shares = (tg->shares * load);
+       shares = (cfs_rq->shares * load);
        if (tg_weight)
                shares /= tg_weight;
 
        if (shares < MIN_SHARES)
                shares = MIN_SHARES;
-       if (shares > tg->shares)
-               shares = tg->shares;
+       if (shares > cfs_rq->shares)
+               shares = cfs_rq->shares;
 
        return shares;
 }
 # else /* CONFIG_SMP */
 static inline long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group 
*tg)
 {
-       return tg->shares;
+       return cfs_rq->shares;
 }
 # endif /* CONFIG_SMP */
 static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
@@ -2515,7 +2515,7 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq)
        if (!se || throttled_hierarchy(cfs_rq))
                return;
 #ifndef CONFIG_SMP
-       if (likely(se->load.weight == tg->shares))
+       if (likely(se->load.weight == cfs_rq->shares))
                return;
 #endif
        shares = calc_cfs_shares(cfs_rq, tg);
@@ -8439,6 +8439,7 @@ void init_tg_cfs_entry(struct task_group *tg, struct 
cfs_rq *cfs_rq,
 
        se->my_q = cfs_rq;
        /* guarantee group entities always have weight */
+       cfs_rq->shares = NICE_0_LOAD;
        update_load_set(&se->load, NICE_0_LOAD);
        se->parent = parent;
 }
@@ -8473,6 +8474,7 @@ int sched_group_set_shares(struct task_group *tg, 
unsigned long shares)
 
                /* Possible calls to update_curr() need rq clock */
                update_rq_clock(rq);
+               group_cfs_rq(se)->shares = shares;
                for_each_sched_entity(se)
                        update_cfs_shares(group_cfs_rq(se));
                raw_spin_unlock_irqrestore(&rq->lock, flags);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index ec2e8d23527e..e75e755ee5e9 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -422,6 +422,7 @@ struct cfs_rq {
        int on_list;
        struct list_head leaf_cfs_rq_list;
        struct task_group *tg;  /* group that "owns" this runqueue */
+       unsigned long shares;
 
 #ifdef CONFIG_CFS_BANDWIDTH
        int runtime_enabled;