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sched: group scheduler, fix bloat
Recent fix to check_preempt_wakeup() to check for preemption at higher levels caused a size bloat for !CONFIG_FAIR_GROUP_SCHED. Fix the problem. 42277 10598 320 53195 cfcb kernel/sched.o-before_this_patch 42216 10598 320 53134 cf8e kernel/sched.o-after_this_patch Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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1 changed files with 26 additions and 19 deletions
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@ -652,15 +652,21 @@ static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
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#define for_each_leaf_cfs_rq(rq, cfs_rq) \
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list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
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/* Do the two (enqueued) tasks belong to the same group ? */
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static inline int is_same_group(struct task_struct *curr, struct task_struct *p)
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/* Do the two (enqueued) entities belong to the same group ? */
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static inline int
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is_same_group(struct sched_entity *se, struct sched_entity *pse)
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{
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if (curr->se.cfs_rq == p->se.cfs_rq)
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if (se->cfs_rq == pse->cfs_rq)
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return 1;
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return 0;
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}
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static inline struct sched_entity *parent_entity(struct sched_entity *se)
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{
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return se->parent;
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}
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#else /* CONFIG_FAIR_GROUP_SCHED */
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#define for_each_sched_entity(se) \
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@ -693,11 +699,17 @@ static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
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#define for_each_leaf_cfs_rq(rq, cfs_rq) \
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for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL)
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static inline int is_same_group(struct task_struct *curr, struct task_struct *p)
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static inline int
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is_same_group(struct sched_entity *se, struct sched_entity *pse)
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{
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return 1;
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}
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static inline struct sched_entity *parent_entity(struct sched_entity *se)
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{
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return NULL;
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}
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#endif /* CONFIG_FAIR_GROUP_SCHED */
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/*
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@ -787,8 +799,9 @@ static void yield_task_fair(struct rq *rq)
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static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
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{
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struct task_struct *curr = rq->curr;
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struct cfs_rq *cfs_rq = task_cfs_rq(curr), *pcfs_rq;
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struct cfs_rq *cfs_rq = task_cfs_rq(curr);
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struct sched_entity *se = &curr->se, *pse = &p->se;
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s64 delta;
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if (unlikely(rt_prio(p->prio))) {
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update_rq_clock(rq);
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@ -797,21 +810,15 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
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return;
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}
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for_each_sched_entity(se) {
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cfs_rq = cfs_rq_of(se);
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pcfs_rq = cfs_rq_of(pse);
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while (!is_same_group(se, pse)) {
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se = parent_entity(se);
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pse = parent_entity(pse);
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}
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if (cfs_rq == pcfs_rq) {
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s64 delta = se->vruntime - pse->vruntime;
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delta = se->vruntime - pse->vruntime;
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if (delta > (s64)sysctl_sched_wakeup_granularity)
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resched_task(curr);
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break;
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}
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#ifdef CONFIG_FAIR_GROUP_SCHED
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pse = pse->parent;
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#endif
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}
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}
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static struct task_struct *pick_next_task_fair(struct rq *rq)
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