Commit bc094757 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'sched-fixes-for-linus' of...

Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: Fix poor interactivity on UP systems due to group scheduler nice tune bug
parents 4398f31c 3ff6dcac
......@@ -699,7 +699,8 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
cfs_rq->nr_running--;
}
#if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_FAIR_GROUP_SCHED
# ifdef CONFIG_SMP
static void update_cfs_rq_load_contribution(struct cfs_rq *cfs_rq,
int global_update)
{
......@@ -762,6 +763,51 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
list_del_leaf_cfs_rq(cfs_rq);
}
static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg,
long weight_delta)
{
long load_weight, load, shares;
load = cfs_rq->load.weight + weight_delta;
load_weight = atomic_read(&tg->load_weight);
load_weight -= cfs_rq->load_contribution;
load_weight += load;
shares = (tg->shares * load);
if (load_weight)
shares /= load_weight;
if (shares < MIN_SHARES)
shares = MIN_SHARES;
if (shares > tg->shares)
shares = tg->shares;
return shares;
}
static void update_entity_shares_tick(struct cfs_rq *cfs_rq)
{
if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) {
update_cfs_load(cfs_rq, 0);
update_cfs_shares(cfs_rq, 0);
}
}
# else /* CONFIG_SMP */
static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
{
}
static inline long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg,
long weight_delta)
{
return tg->shares;
}
static inline void update_entity_shares_tick(struct cfs_rq *cfs_rq)
{
}
# endif /* CONFIG_SMP */
static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
unsigned long weight)
{
......@@ -782,7 +828,7 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta)
{
struct task_group *tg;
struct sched_entity *se;
long load_weight, load, shares;
long shares;
if (!cfs_rq)
return;
......@@ -791,32 +837,14 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta)
se = tg->se[cpu_of(rq_of(cfs_rq))];
if (!se)
return;
load = cfs_rq->load.weight + weight_delta;
load_weight = atomic_read(&tg->load_weight);
load_weight -= cfs_rq->load_contribution;
load_weight += load;
shares = (tg->shares * load);
if (load_weight)
shares /= load_weight;
if (shares < MIN_SHARES)
shares = MIN_SHARES;
if (shares > tg->shares)
shares = tg->shares;
#ifndef CONFIG_SMP
if (likely(se->load.weight == tg->shares))
return;
#endif
shares = calc_cfs_shares(cfs_rq, tg, weight_delta);
reweight_entity(cfs_rq_of(se), se, shares);
}
static void update_entity_shares_tick(struct cfs_rq *cfs_rq)
{
if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) {
update_cfs_load(cfs_rq, 0);
update_cfs_shares(cfs_rq, 0);
}
}
#else /* CONFIG_FAIR_GROUP_SCHED */
static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
{
......
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