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authorSrivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>2007-10-15 17:00:12 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:12 +0200
commitfad095a7b963d9e914e0cdb73e27355c47709441 (patch)
treeafb9056ce0416a48d3f62b1f1e85f3d5627de913 /kernel/sched_fair.c
parentfb615581c78efee25e4d04f1145e8fa8ec705dc3 (diff)
downloadblackbird-op-linux-fad095a7b963d9e914e0cdb73e27355c47709441.tar.gz
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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>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c43
1 files changed, 25 insertions, 18 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index c44a295eee0e..57e7f3672fd7 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -652,15 +652,21 @@ static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
#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) \
@@ -693,11 +699,17 @@ static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
#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 */
/*
@@ -787,8 +799,9 @@ static void yield_task_fair(struct rq *rq)
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);
@@ -797,21 +810,15 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
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)
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