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 <[EMAIL PROTECTED]> --- kernel/sched_fair.c | 43 +++++++++++++++++++++++++------------------ 1 files changed, 25 insertions(+), 18 deletions(-) Index: current/kernel/sched_fair.c =================================================================== --- current.orig/kernel/sched_fair.c +++ current/kernel/sched_fair.c @@ -640,15 +640,21 @@ static inline struct cfs_rq *cpu_cfs_rq( #define for_each_leaf_cfs_rq(rq, cfs_rq) \ list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list) -/* Do the two (enqueued) tasks belong to the same group ? */ -static inline int is_same_group(struct task_struct *curr, struct task_struct *p) +/* Do the two (enqueued) entities belong to the same group ? */ +static inline int +is_same_group(struct sched_entity *se, struct sched_entity *pse) { - if (curr->se.cfs_rq == p->se.cfs_rq) + if (se->cfs_rq == pse->cfs_rq) return 1; return 0; } +static inline struct sched_entity *parent_entity(struct sched_entity *se) +{ + return se->parent; +} + #else /* CONFIG_FAIR_GROUP_SCHED */ #define for_each_sched_entity(se) \ @@ -681,11 +687,17 @@ static inline struct cfs_rq *cpu_cfs_rq( #define for_each_leaf_cfs_rq(rq, cfs_rq) \ for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL) -static inline int is_same_group(struct task_struct *curr, struct task_struct *p) +static inline int +is_same_group(struct sched_entity *se, struct sched_entity *pse) { return 1; } +static inline struct sched_entity *parent_entity(struct sched_entity *se) +{ + return NULL; +} + #endif /* CONFIG_FAIR_GROUP_SCHED */ /* @@ -775,8 +787,9 @@ static void yield_task_fair(struct rq *r static void check_preempt_wakeup(struct rq *rq, struct task_struct *p) { struct task_struct *curr = rq->curr; - struct cfs_rq *cfs_rq = task_cfs_rq(curr), *pcfs_rq; + struct cfs_rq *cfs_rq = task_cfs_rq(curr); struct sched_entity *se = &curr->se, *pse = &p->se; + s64 delta; if (unlikely(rt_prio(p->prio))) { update_rq_clock(rq); @@ -785,21 +798,15 @@ static void check_preempt_wakeup(struct return; } - for_each_sched_entity(se) { - cfs_rq = cfs_rq_of(se); - pcfs_rq = cfs_rq_of(pse); + while (!is_same_group(se, pse)) { + se = parent_entity(se); + pse = parent_entity(pse); + } - if (cfs_rq == pcfs_rq) { - s64 delta = se->vruntime - pse->vruntime; + delta = se->vruntime - pse->vruntime; - if (delta > (s64)sysctl_sched_wakeup_granularity) - resched_task(curr); - break; - } -#ifdef CONFIG_FAIR_GROUP_SCHED - pse = pse->parent; -#endif - } + if (delta > (s64)sysctl_sched_wakeup_granularity) + resched_task(curr); } static struct task_struct *pick_next_task_fair(struct rq *rq) -- Regards, vatsa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/